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1

Odporność korozyjna żarowytrzymałej stali austenitycznej Super 304H

Golański Grzegorz, Jagiellska-Wiaderek Karina, Maternicki Marcin, Grodzki Jacek

Energetyka

|

2026

|

nr 2

84--87

PL

W artykule przedstawiono badania mlkrostrukturalne oraz odporności korozyjnej austenitycznej stali Super 304H w stanie dostawy i po eksploatacji. Wykazano, że w stanie dostawy analizowany stop cechuje się wymaganą odpornością na korozję ogólną i wżerową oraz zdolnością do repasywacji. Wydzielanie się w czasie eksploatacji licznych cząstek bogatych w chrom prowadzi do pogorszenia ogólnej odporności korozyjnej, jednocześnie podwyższając skłonność stali do korozji lokalnej. Wykazano również ograniczenie zdolności stali Super 304H po eksploatacji do repasywacji.

EN

The paper presents research on the microstructure and corrosion resistance of austenitic Super 304H steel in the as-received state and after service. It has been shown that in the as-received state the analyzed alloy is characterized by the required resistance to general corrosion and pitting corrosion, as well as the ability to repassivation. The precipitation of numerous particles rich in chromium during the service leads to a decrease in the general resistance to corrosion, at the same time increasing the susceptibility of the steel to local corrosion. It was also shown that the Super 304H steel after service had limited ability to repassivation.

2

Zasady wykonywania uziomów fundamentowych w Niemczech, Austrii i Szwajcarii (cz. 2)

Wincencik Krzysztof

Wiadomości Elektrotechniczne

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2025

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R. 93, nr 10

26--31

PL

Poniższy artykuł techniczny omawia zasady wykonywania uziomów fundamentowych w: Niemczech, Austrii i Szwajcarii, ze szczególnym uwzględnieniem zmian wprowadzonych przez najnowsze wydanie niemieckiej normy krajowej DIN 18014:2023.

EN

The following technical article discusses the principles for installing foundation earth electrodes in Germany, Austria, and Switzerland, with a particular focus on the changes introduced by the latest edition of the German national standard DIN 18014:2023.

3

Effect of Fe and Mn on corrosion resistance of recycled self-hardening AlZn10Si8Mg alloy

Mikolajčík Martin, Tillová Eva, Kuchariková Lenka, Šurdová Zuzana

Production Engineering Archives

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2025

|

Vol. 31, Iss. 1

54--64

EN

Recycled aluminium alloys are a highly valued alternative for manufacturers, particularly in the automotive and aerospace industries, due to increasing demands on the environmental performance and sustainability of the industry. Self-hardening aluminium alloys, which achieve the required mechanical properties without heat treatment, enable the emissions generated by production to be reduced even further. In addition to an advantageous strength-to-weight ratio and excellent machinability, corrosion resistance in a variety of environments is also important in most applications of aluminium alloys. Repeated recycling cycles negatively influence the quality of aluminium because of an increase in iron content, which is considered an impurity. This is due to the formation of intermetallic phases which negatively affect the mechanical, fatigue and corrosion properties. In this paper, the effect of Fe and Mn on the microstructure and corrosion resistance of self-hardening recycled AlZn10Si8Mg alloy was investigated using the AUDI test, atmospheric long-terming test and 3.5% NaCl solution test. The corrosion mechanism was subsequently determined by sectioning the samples. Alloy A with the lowest iron content exhibited the best corrosion behaviour, as it was subjected to only localised forms of corrosion even in the aggressive environment of the AUDI test. In this environment, the other alloys were attacked by general corrosion of the entire surface. Manganese alloying caused a subtle improvement in the corrosion resistance of alloy D but was limited by the high porosity. The eutectic and intermetallic phases corroded the most, while the alpha phase was more resistant.

4

Badania odporności korozyjnej warstw węglowych na stopach magnezu

Gołąbczak Marcin

Obróbka Metalu

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2025

|

nr 1

43--49

PL

W artykule scharakteryzowano właściwości użytkowe stopów magnezu typu Mg-Al-Zn oraz przedstawiono wybrane wyniki badań dotyczących oceny odporności korozyjnej stopów magnezu AZ31 z wytworzonymi na ich powierzchniach węglowymi warstwami ochronnymi z dużą zawartością diamentu i porównawczo - bez tych warstw. Zaprezentowane wyniki badań obejmują ocenę porównawczą odporności elektrochemicznej i odporności korozyjnej w komorze solnej próbek ze stopu magnezu AZ31 zabezpieczonych warstwą węglową wytworzoną w optymalnych warunkach procesu PACVD (Plasma Activated Chemical Vapour Deposition), i próbek bez tej warstwy. Dla określenia przepływu prądu w szerokim zakresie zmian potencjału korozyjnego zastosowano model przepływu prądu wykorzystujący elektryczny obwód nieliniowy, zawierający elementy odpowiedzialne za poszczególne zjawiska fizyczne zachodzące podczas pomiaru potencjostatycznego. Do obserwacji zmian korozyjnych wykorzystano mikroskop optyczny oraz analizę SEM.

EN

In this paper the performance properties of Mg-Al-Zn magnesium alloys were characterized. Selected results of studies evaluating the corrosion resistance of AZ31 magnesium alloys with carbon-rich protective layers produced on their surface and comparatively, without these layers, were also presented. The research results presented include a comparative evaluation of electro-chemical resistance and corrosion resistance in the salt chamber of samples of AZ31 magnesium-alloy secured with carbon-rich layers produced under optimal PACVD (Plasma Activated Chemical Vapour Deposition) process conditions, and samples without this layer. A current flow model based on a nonlinear electrical circuit, containing elements responsible for individual physical phenomena occurring during the measurement of the potential, was used to determine the current flow in a wide range of corrosion potential changes. An optical microscope and SEM analysis were used to observe the corrosion changes.

5

Preparation and corrosion resistance analysis of composite polyurethane wind turbine blade materials

Xie Pengkang, Jiang Zhenglong

Materials Science Poland

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2025

|

Vol. 43, No. 2

23--39

EN

To enhance the rain erosion resistance of wind turbine blade leading-edge protection materials, a series of modified polyurethane (PU) composites were developed by optimizing the synthesis process of PU prepolymers – specifically by tuning the isocyanate (NCO) content, selecting polycaprolactone diols (PCL) with different molecular weights, and introducing an organic titanium catalyst (2210) and hydroxy-terminated polydimethylsiloxane (HO-PDMS). The effects of these components on the mechanical properties, rain erosion resistance, and thermal stability were systematically investigated. Results showed that optimizing the NCO content balanced strength and toughness, achieving a tensile strength of 25.0 MPa at 6% NCO and peak hardness (94.2 Shore A) at 9% NCO. Higher molecular weight PCL (2,000 g/mol) significantly enhanced tensile strength (27.72 MPa) and elongation at break (395.2%) due to improved microphase separation. The addition of 0.03 wt% catalyst 2210 reduced demolding time to 49 min and improved mechanical properties. PU containing 7 wt% HO-PDMS (Mn = 1,000 g/mol, sample SPU7) exhibited optimal rain erosion life (31.6 h), superior thermal stability, and high storage modulus. However, excessive HO-PDMS (e.g., SPU9) led to interfacial defects. This study provides a promising strategy for developing long-lasting, high-reliability protective materials for wind turbine blades.

6

Influence of Selected Corrosive Environment on the Scale Formation in Selected Materials Manufactured by Directed Energy Deposition 3D Printing Technology

Małysza Marcin, Rząd Ewa, Zięba Łukasz

Journal of Casting & Materials Engineering

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2025

|

Vol. 9, no. 3

23--31

EN

Additive technologies, and in particular Directed Energy Deposition (DED), are becoming an increasingly important tool for the rapid production of components operating in, among others, the energy, aviation, petrochemical industries, where components are exposed to extreme thermochemical conditions. In the article, the influence of various corrosive atmospheres atmospheric air, water vapor and SO₂-argon- mixture – on the process of scale formation on the surface of materials manufactured using Directed Energy Deposition (DED) technology is presented. The tests were carried out at a temperature of 600°C (for air and water vapor) and 300°C (for SO₂-argon atmosphere). The mass increase and surface damage was monitored. It has been shown that the chemical composition of materials, especially the content of alloying elements such as Cr and Ni, is crucial for corrosion resistance. The obtained results provide the basis for further optimization of the composition of powders used in additive manufacturing techniques, in terms of operating conditions in aggressive environments.

7

Three-layer Repair Coating System for Manholes, Pump Stations, and Tanks in Aggressive Sulfate Environment

Pawlak Tomasz, Szymczak-Graczyk Anna, Garbowski Tomasz

Civil and Environmental Engineering Reports

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2025

|

Vol. 35, no. 1

1--19

EN

Advancements in the repair and protection of water and wastewater infrastructure are now focused on using an innovative material called polyurea. Distinguished by its rapid curing time and versatile applications, polyurea is applied using a spray gun with high-pressure pumps. The introduction of new building materials is part of ongoing efforts to meet stringent environmental, health, and performance standards, and polyurea offers significant improvements by eliminating solvents and volatile organic compounds (VOCs). This paper presents a technological protocol starting with inspection and cleaning, followed by drying, and ending with the application of three layers: a moisture-blocking base layer, a rigid polyurethane middle layer for structural reinforcement, and a final sealing and anti-corrosion layer. This innovative method ensures a homogeneous, seamless structure, enhances construction durability, and accelerates the repair process, allowing immediate resumption of operation. Designed specifically for aggressive wastewater environments, this system is characterized by excellent corrosion resistance, making it ideal for water and wastewater infrastructure elements such as reinforced concrete manholes, sewage pumping stations, and tanks. Customizable polyurea properties allow personalization based on environmental aggressiveness, structure size, and abrasion resistance, representing a significant advancement in infrastructure maintenance technology. The paper showcases this modern repair and renovation method, highlighting its applications, benefits, and potential to revolutionize water and wastewater infrastructure maintenance in challenging conditions. The effectiveness of this solution is also compared with traditional methods, demonstrating the superiority of the three-layer system in terms of waterproofing, sulfuric acid resistance, monolithic structure, and application time.

8

Surface Properties of Electrolytic Polished Layer on STS316L by Single Melting and Double Melting

Lee Donhee, Kang Du Hong, Kim Poongyeon, Chang Si Young

Archives of Metallurgy and Materials

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2025

|

Vol. 70, iss. 3

1165--1168

EN

In this study, STS316L produced by a single-melting vacuum oxygen decarburization (VOD) process, referred to as SM, and a double-melting process involving vacuum induction melting (VIM) and vacuum arc remelting (VAR), referred to as DM, was subjected to extrusion and drawing to form a tube, followed by electrolytic polishing (EP). The surface roughness of layer on the DMed sample is 0.02 μm, which is much lower than that on the SMed sample of 0.13 μm. The thickness of the EP layer on STS316L by SM and DM revealed the values of approximately 7.1 nm and 8.2 nm, respectively. The Cr/Fe and CrO/FeO ratios in the EP layer on the DMed sample were 1.62 and 2.26, respectively, while, in the SMed sample, 1.22 and 2.03. Consequently, the EPed STS316L by DM showed better corrosion resistance in HCl solution and small amounts of Cr and Fe eluted in HCl solutions.

9

Corrosion Behavior of (Copper/Nickel) step-wise Functionally Graded Materials

Abdulamer Dheya, Ghafil Noor Sh, Albusalih Dhuha, Atiyah Alaa Abdulhasan

Archives of Foundry Engineering

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2025

|

Vol. 25, iss. 1

85--90

EN

The present paper involves studying of the corrosion behaviour of five layers Cu/Ni Functionally Graded Materials (FGMs) in a 3.5 % NaCl solution to examine corrosion potentials (Ecorr.), corrosion current densities (icorr.) and Tafel slope. Three series of FGMs samples, labeled A1-A6, B1-B6, and C1-C6 were prepared using different experimental conditions of compaction pressure (0.7, 1 and 1.3 MPa), sintering temperature (650, 750 and 850oC) and sintering time (1 and 2 hours). The polarisation method was conducted at 3 mV/s of a scan rate, and room temperature. According into the potentiodynamic polarization test, it was found that the sintering time of 2 hrs at constant temperature, and pressure enhances the corrosion potential towards stabilization the protective surface layer. A3, A4 are samples designation corresponding to different experimental settings determined by design of experiments. Corrosion current density measurements showed that A4 sample had the highest (673.20 μA/cm²), while A3 sample had the lowest icorr (0.8508 μA/cm²). Tafel slope analysis revealed that A3 sample had the highest anodic, and cathodic slopes, and was associated with the lowest corrosion rate. The corrosion resistance (Rp) data supported these results, with A3 showing the highest resistance, confirming its superior corrosion resistance (Rp). This behaviour may be related into the noble properties of copper, and the protection of cupric oxide (CuO) compared to (NiO).

10

Microstructural, mechanical, and corrosion behavior of ZrO2, HA, and Y2O3 hybrid reinforced AZ91D alloy surface composites fabricated through FSP route

Patel Surendra Kumar, Dai Guoxin, Shi Lei, Wu Chuansong, Mironov Sergey, Guan Lei

Archives of Civil and Mechanical Engineering

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2025

|

Vol. 25, no. 1

art. no. e56, 2025

EN

In the present work, ZrO2, HA, and Y2O3 hybrid reinforced AZ91D alloy surface composites were fabricated using multi-passes friction stir processing (FSP) route. Consequently, microstructure, microhardness, tensile, and corrosion behavior were thoroughly examined on processing passes. The FSP passes increased coarse-shaped grains which were gradually refined into finer equiaxial grains due to severe plastic deformation and equal dispersion of reinforcements. Microhardness values successfully increased with the incorporation of hybrid reinforcements and increasing FSP passes. Tensile tests demonstrated decreased ultimate tensile strength as compared to substrate materials but an increase compared to 1 pass to 3 passes. Due to grain arrangements, grain dislocations decreased between surface matrices. Corrosion rate increases with the number of days; however, when FSP passes rise, compared to FSP passes, corrosion rate also increases due to the formation of secondary surface layers on the surface.

11

Increasing the corrosion resistance of the center plate unit in railway freight car

Bulakh Maryna, Bieniaś Jarosław, Ostapiuk Monika, Molchanov Dmytro, Lunys Olegas, Muradian Leontii

Advances in Science and Technology. Research Journal

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2025

|

Vol. 19, no. 11

176--188

EN

One of the most damage-prone components of a freight car is the center plate, which is highly susceptible to wear and corrosion. This study investigated the application of a composite coating based on a FeCrNi alloy with the addition of chromium carbide (Cr₃C₂) to protect the steel surfaces of the center plate from corrosion and mechanical degradation. The coating was applied using laser cladding and subjected to comprehensive testing, including electrochemical analysis (OCP, polarization, and electrochemical impedance spectroscopy), microhardness measurements, and microstructure evaluation using scanning electron microscopy (SEM). The results showed that the coating exhibited a stable corrosion potential, low corrosion current density, and high impedance at low frequencies, indicating good protection against ion penetration and electrode reactivity, while significantly improving the microhardness of the base material. This study demonstrates the potential of the modified FeCrNi-based coating in extending the service life, enhancing the operational reliability, and increasing the corrosion resistance of center plates in freight cars.

12

Improved corrosion resistance in biomaterial applications of AISI 316L alloy

Maged Saja A. Abdul, Hadi Rusul Salah

Advances in Science and Technology. Research Journal

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2025

|

Vol. 19, no. 9

254--265

EN

This paper addresses the corrosion performance of AISI 316L stainless steel, an important biomaterial, in simulated physiological environments and aggressive media. Rectangular samples (1 cm × 1 cm, 1 mm thickness) were prepared from 316L alloy and electrochemical tests were performed in a 3 electrode cell at 37 ◦C ± 0.4 ◦C. Potentiodynamic polarization curves were recorded after 2 hours of immersion in Ringer's solution and other media with an overvoltage range of [ -400 mV, +400 mV] versus Ag/AgCl. The polarization resistance in Ringer's solution was 2.1 kΩ·cm2 (±0.18) with corrosion current density of 0.23 µA/cm2, which was better than NaCl and HNO3 solutions. The carbonate ions in Ringer's inhibited the pitting corrosion pathway while low carbon content in the alloy prevented the formation of carbides at grain boundaries inhibiting intergranular corrosion. These results demonstrate that the homogeneity of the alloy and stability of the passive film are both essential to corrosion resistance and influenced by other factors such as chemical composition, structure, and environmental condition. These findings provide evidence for AISI 316L stainless steel as appropriate biomedical material where long-term corrosion resistance is an important design factor.

13

Corrosion behavior of nano bio coating on AZ31 magnesium alloy by electrophoretic deposition for biomedical application

Radhi Maream Ali, Mustafa Ali Mundher, Abdulkareem Makarim H.

Advances in Science and Technology. Research Journal

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2025

|

Vol. 19, no. 8

296--312

EN

Magnesium alloy AZ31 is a promising material for biodegradable implants due to its mechanical similarity to bone and its natural degradation in the body, eliminating the need for surgical removal. However, its clinical application is limited by rapid corrosion and susceptibility to bacterial colonization. This study addresses these challenges by applying nano-scale bioactive coatings of hydroxyapatite (HA) and calcium oxide (CaO) onto AZ31 using electrophoretic deposition (EPD). Coatings were deposited under optimized conditions (20 V, 4 minutes, 5 wt%) and evaluated for morphology, thickness, wettability, antibacterial activity, and bioactivity. Single and multilayer coatings showed thicknesses from 21.23 µm to over 100 µm. SEM and EDS analyses confirmed uniform, crack-free coatings with strong adhesion. Zeta potential measurements above +30 mV indicated stable suspensions, while contact angle measurements revealed significantly enhanced hydrophilicity, especially in triple-layer coatings, which showed a contact angle as low as 1. 58°.Antibacterial assays demonstrated strong inhibition of Staphylococcus aureus, with inhibition zones up to 46 mm, while the uncoated alloy showed no antibacterial effect. After 14 days in simulated body fluid, all coated samples exhibited apatite formation, indicating improved bioactivity. The best performance was observed in the triple-layer configuration (CaO + (HA+CaO) + HA), which achieved the lowest corrosion current density (0.0619633 µA) and the highest corrosion potential (-895.349 mV). These results indicate that this multilayer coating forms an effective protective barrier against corrosion and enhances the biological performance of AZ31.Overall, nano HA/CaO multilayer coatings significantly improve the corrosion resistance, antibacterial properties, and bioactivity of AZ31, supporting their potential use in biodegradable implant applications.

14

Anti-corrosion potential of the low-pressure nitriding method for the iron alloys

Wołowiec-Korecka Emilia, Michalski Jerzy, Lipiński Piotr

Advances in Science and Technology. Research Journal

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2025

|

Vol. 19, no. 5

297--306

EN

The aim of this study is to analyse the low-pressure nitriding method to determine its anti-corrosion protection potential. Components made of C20, 41CrAlMo7 and 42CrMo4 steels were low-pressure nitrided in a pure ammo- nia atmosphere under a pressure of 26 hPa. The nitrided layers formed were analysed in terms of structure, effective layer thickness, corrosion resistance and friction wear resistance. It was determined that an iron nitride layer with a phase composition of ε+γ’ and a thickness of not less than 10 µm provides effective protection against the corrosive influence of the urban environment for up to 3 months, while layers with a thickness of not less than 14 µm provide effective protection for up to 5 months. The iron nitride layer was found to increase the friction wear resistance of the nitrided steel. The wear that occurs within the iron nitride layer is linear. The wear process, after exceeding the thickness of the iron nitride layer, progresses to an accelerated wear phase, which ultimately leads to seizure.

15

Characteristics of AISI 420 and AISI 301 stainless steels coatings obtained by thermal spraying

Younes Rassim, Tomków Jacek, Skowrońska Beata, Bradai Mohand Amokrane

Advances in Materials Science

|

2025

|

Vol. 25, nr 1(83)

95--111

EN

In this study, AISI 301 and AISI 420 stainless steels were deposited on an AISI 4135 substrate using the wire arc spray process (WASP). X-ray spectrum analysis revealed the presence of a body centred cubic (bcc) structure in both coatings. In particular, the AISI 301 coating showed the additional identification of chromium carbide Cr7C3. Conversely, the AISI 420 coating manifested the presence of a body centred cubic (Fe, Cr) structure, which is indicative of the formation of solid solutions and the development of carbides, due to significant statistical variations in the composition. Vickers HV0.3 microhardness measurements were carried out and showed that the AISI 420 coating had a higher hardness (549 ± 17 HV0.3) compared to the AISI 301 coating (383± 18.75 HV0.3). The formation of oxides, a phenomenon not present in the AISI 301 coating, is attributed to this difference in hardness. The wear resistance of the AISI 301 and AISI 420 stainless steel coatings was evaluated at different sliding speeds (0.5 and 1 m/s) and under different applied loads, its expose the AISI 420 had less wear rate (2,64E-08 mg/m ± 1,66667E-7) than AISI 301 (1,13E-05 mg/m ± 5,63E-07) . Moreover, the corrosion behaviour of specimens was determined. It is noteworthy that AISI 420 coating provides 93.5% effective protection higher than that of AISI 301 coatings.

16

Corrosion resistance of additive manufactured 17-4ph dmls steel after heat treatment and shot peening process

Świetlicki Aleksander, Walczak Mariusz, Szala Mirosław

Acta Mechanica et Automatica

|

2025

|

Vol. 19, no. 2

205--211

EN

Additively manufactured steel is not free of drawbacks and defects. Such disadvantages include high roughness and lower hardness compared to conventional steel. The 17-4PH steel is a grade designed for precipitation hardening. The application of 17-4PH steel ranges from turbine blades, pumps, valves, and propellers for aerospace, maritime, nuclear power plants, and medical instruments. This grade of steel is often applied where high mechanical performance and good corrosion resistance are required. Considering these factors, it was decided to use a heat treatment designed for conventional steel of this steel grade, that is, a precipitation hardening process followed by shot peening. The use of a constant supersaturation temperature of 1040°C and aging at 450°C made it possible to evaluate the mechanical properties depending only on the type of treatment used. Different peening media were also used to determine the effect of the medium on the properties of the surface layer after the peening process. To determine the surface characteristics, tests were carried out using optical profilometry, above that, hardness was tested, and corrosion resistance was examined using potentiodynamic polarization tests in a 3.5% NaCl environment. The aim of this study is to evaluate the effect of precipitation hardening combined with SP on the corrosion resistance of 17-4PH steel. Results obtained for steel produced using DMLS technology were compared with conventionally fabricated 17-4PH steel. Heat treatment contributed to a greater increase in hardness for the DMLS made steel. The corrosion resistance turned out to be dependent mainly on the roughness that increased after the Shot Peening process. The main purpose of the study was to evaluate the effects of precipitation hardening combined with shot peening on the corrosion resistance of 17-4PH steel. Results obtained for steel produced using DMLS technology were compared with conventionally produced 17-4PH steel.

17

Effect of solution annealing on corrosion resistance of austenitic stainless steels in chloride-containing environment

Zatkalíková Viera, Markovičová Lenka, Uhríčik Milan, Slezák Martin

System Safety : Human - Technical Facility - Environment

|

2024

|

Vol. 6, iss. 1

421--429

EN

Austenitic stainless steels are highly corrosion-resistant in common oxidation environments. However, aggressive chloride-containing solutions can evoke local corrosion, which performs an important risk in the safe use of these materials. This research deals with the effect of the solution annealing (1050 °C, 15 min) on the electrochemical parameters of AISI 304 and AISI 316L stainless steels. Corrosion resistance of the solution-annealed specimens is evaluated and compared to the as received specimens by the potentiodynamic polarization test performed in 1M pH neutral NaCl solution at the 20 ± 3 °C temperature. The obtained results did not clearly confirm the positive effect of solution annealing on corrosion resistance in the given aggressive solution. Although the pitting potentials indicating higher pitting corrosion resistance increased, the kinetics of the corrosion process intensified.

18

Corrosion resistance of PPTA Ni-based hardfacing layers

Górnik Monika, Lachowicz Marzena, Łatka Leszek

Materials Science Poland

|

2024

|

Vol. 42, No. 4

66--78

EN

In this study, the corrosion resistance of four different hardfacing layers in a 3.5% NaCl solution was tested. Using 316L steel as a reference material, NiCrBSi, NiCrBSi + 35 wt% WC, and NiCrCuMo were deposited onto a structural steel S235JR substrate using the plasma powder transferred arc technology and prepared samples in a disc form for testing. The purpose of this investigation was to propose an alternative material to the commonly known anti-corrosion protection product of 316L steel simultaneously with better wear resistance. Its corrosion damage mechanism was assessed based on electrochemical examination and is related to changes in the microstructure of the sample surface investigated by using a potentiostat and a scanning electron microscope. Polarization tests were carried out, which confirmed that all proposed overlayers provide effective anti-corrosion protection. For all samples, the corrosion current density did not exceed 0.3 µA/cm2, and the corrosion potential was not less than −290.9 mV, which were considered positive results.

19

Corrosion resistance of laser beam welded joints in ferritic stainless steel

Lisiecki Aleksander, Orłowski Jan, Topolska Santina

Materials Science and Welding Technologies / Technologie Materiałowe i Spawalnicze

|

2024

|

Vol. 68, No. 3

art. no. 2

EN

The primary goal of the research work was to determine the corrosion resistance of laser beam-welded joints made of ferritic stainless steel X2CrTiNb18 (1.4509) having a thickness of 1.5 mm. In some of the test joints, the weld was subjected to rolling. In addition, some other joints were subjected to heat treatment involving the use of a prototype induction heating welding station. The research work-related test results revealed that the test joints with the weld subjected to rolling were characterised by a significantly lower rate of linear corrosion progression (linear corrosion rate Vp = 0.008672 mm/year) compared to the test joints only subjected to laser beam welding and those subjected to heat treatment (Vp = 0.011052 mm/ year).

PL

Głównym celem badań było określenie odporności korozyjnej złączy blach ze stali nierdzewnej ferrytycznej X2CrTiNb18 (1.4509) o grubości 1,5 mm spawanych laserowo. Część złączy próbnych poddano operacji rozwalcowania spoiny, a część dodatkowo obróbce cieplnej na prototypowym stanowisku z nagrzewaniem indukcyjnym. Badania wykazały, że złącza próbne poddane operacji rozwalcowania spoiny wykazują wyraźnie niższą szybkość liniowego postępowania korozji (liniowa szybkość postępowania korozji Vp = 0,008672 mm/rok) w porównaniu ze złączami próbnymi spawanymi wyłącznie laserowo oraz z tymi poddanymi obróbce cieplnej (Vp = 0,011052 mm/rok).

20

Polydopamine coating effectively prevents early-stage corrosion of pure magnesium in tissue culture medium

Kitada Kotomi, Yoshitomi Sayuki, Sugiyama Minori, Morishige Taiki, Kakinoki Sachiro

Engineering of Biomaterials

|

2024

|

vol. 27, no. 172

art. no. 05

EN

Pure magnesium, free from toxic elements, has been identified as a promising candidate for bioabsorbable orthopaedic devices. However, its rapid corrosion in physiological environments presents a significant challenge for practical applications. Chemical coatings, such as polydopamine (PDA), offer a potential solution to improve the corrosion resistance of pure magnesium. Nevertheless, the reaction conditions must be meticulously optimized, particularly in the presence of salts, as magnesium is highly sensitive to environmental factors. In this study, a PDA coating, widely investigated for improving the corrosion resistance of magnesium alloys, was applied to pure magnesium, avoiding the conventional Tris-HCl buffer. Instead, a 0.01 mol/L NaOH aqueous solution was used successfully to coat PDA layer on the surface of pure magnesium. The corrosion behaviour of PDA-coated magnesium was evaluated using electrochemical measurements and magnesium ion elution profiles in a tissue culture medium containing 5 vol% of fetal bovine serum at 37ºC. The results demonstrated that the PDA coating effectively mitigated early-stage corrosion of the pure magnesium substrate. This method provides a straightforward approach to enhancing the corrosion resistance of pure magnesium, and the PDA layer can also function as an intermediate platform for further biofunctional surface modifications, potentially expanding its applications in biomedical fields.