Wyniki wyszukiwania - Biblioteka Nauki

1

Selection of cutting and washing fluids as a method of waste minimization

100%

Rymarczyk A. , Mędrzycka K. , Tomczak-Wandze R.

Polish Journal of Chemical Technology

|

2007

|

tom 9

|

nr 3

143-146

EN

The results of the corrosion test for washing and cutting fluids used in the process of gear-shafts production are presented. The test has been performed according to the DIN 51360-2 (Ford-test) and the PN-92/M-55789 procedures. Three cutting fluids and three washing fluids were chosen and their solutions in tap water (used in practice in the company) were investigated. On the basis of the obtained results it has been stated that the lower the fluid concentration, the stronger corrosion is developed. The concentrations recommended by the producer in the case of cutting fluids are properly chosen. For washing fluids two regions of concentration have been evaluated. The concentration recommended for rinsing is too low for protection against corrosion, while higher concentrations, for the washing process, are properly chosen, and corrosion did not occur.

2

Evaluation of Corrosion Hazard in PF Boilers Applying the Oxygen Content in Flue Gases

100%

Bukowski P. , Hardy T. , Kordylewski W.

|

2009

|

tom Vol. 29 nr 1-2

11-18

EN

An important indicator of corrosion hazard in PF boilers is flue gas content in the boundary layer near watertubes. In practice, the two flue gas components are measured: O2 and CO. High content of CO (over 5 000 ppm) and O2 below 1% indicates reductive atmosphere corresponding to the high rate of low - NOx corrosion. Usually, the measurements of O2 and CO content are performed once a year, when a boiler is out of the operation. An idea of a monitoring system development, based on flue gas on-line analysis, was born to control corrosion hazard in continuous manner. The system should operate automatically under supervision of a computer applying sensors able to convert gas concentrations into electric signals directly, like zirconia oxygen analyzer for O2. Unfortunately, similar devices for CO are unavailable, because carbon monoxide concentration in combustion gases is one of the most difficult foreseeable species in combustion systems. However, it is possible to evaluate the CO concentration on the ground of O2 measurements in flue gas. Based on a long-term experience, an effort to find this dependence was made and the correlation between the oxygen and carbon monoxide concentration in a boiler furnace was worked out. The obtained relationship made it possible to correlate the rate of corrosion and the content of oxygen, and to estimate the corrosion hazard in a furnace on-line from the O2 content detected by the monitoring system. In the article the relationship between CO and O2 is presented in the form of graphs and formulas, and the influence of O2 content on the corrosion rate is shown as well. The obtained relationships were verified by the measurements of watertubes thickness. All the measurements data used in the paper proceeded from the measurements carried out at the BP-1150 boiler in power plant Elektrownia Opole S.A. during 2001-2003.

3

Cathodic protection of underground objects

80%

Wantuch A.

|

2010

|

tom R. 86, nr 12

167-169

EN

The present article describes the method of computation of the current density, potential and polarization distribution around metallic structures buried in soil when conductivities of both electrodes have finite values. First partial differential equations together with appropriate boundary conditions are developed and next solved by finite element method (FEM) in 2D. Protection against corrosion of the steel tank is attained by placing protecting electrode. The main goal of this publication is the computation of such distribution of the protecting anode where protected structure will not corrode. At the end some illustrative example is given.

PL

Niniejszy artykuł opisuje metodę obliczania gęstości prądu oraz rozkładu potencjału wokół konstrukcji metalowych znajdujących się w ziemi. Równania wraz z wymaganymi warunkami brzegowymi rozwiązano w przestrzeni 2D metodą elementów skończonych (MES). Ochronę stalowego zbiornika przed korozją osiąga się dzięki wprowadzeniu elektrody ochronnej. Podstawowym celem tej publikacji jest obliczenie takiej dystrybucji anody ochrony by chroniona struktura nie była narażona na korozję.

4

Problemy korozji w instalacjach i układach przygotowania ciepłej wody

80%

Szaflik W.

|

2009

|

tom nr 4

22-25

PL

W artykule omówiono problem korozji instalacji i układów przygotowania ciepłej wody wykonywanej z rur stalowych ocynkowanych i przedstawiono przykłady jej błędnych rozwiązań. Na wstępie krótko scharakteryzowano proces korozji. Następnie omówiono najczęstsze przyczyny korozji. Na podstawie obserwacji można stwierdzić, że pomimo wiedzy na temat korozji instalacji ciepłej wody, niektóre z instalacji są niewłaściwie zaprojektowane i wykonane. Na końcu artykułu w podsumowaniu omówiono najczęściej spotykane błędy w rozwiązaniach instalacji i układów.

EN

The problem with corrosion in hot water preparation systems made of galvanised steel pipes as well as the examples of its incorrect solutions was presented in the article. To begin with the corrosion process was briefly described. Than the most often reasons of corrosion were discussed. On the observation basis it can be stated that despite of the knowledge concerning hot water systems corrosion some of the systems were designed incorrectly and wrongly built. At the end of the article to summarize, the most often met mistakes in hot water systems solutions were discussed.

5

The effect of SO3-Ph-BTBP on stainless steel corrosion in nitric acid

80%

Wilbraham R. J. , Boxall C.

Nukleonika

|

2015

|

tom 60

|

nr 4

865-869

EN

SO3-Ph-BTBP is a hydrophilic tetra-N-dentate ligand proposed for An(III)/Ln(III) separation by solvent extraction, and a candidate for use in future advanced reprocessing schemes such as GANEX and SANEX. We present the first study of the effect of SO3-Ph-BTBP on the corrosion behavior of stainless steels. Specifically, studies have been performed using steels and conditions equivalent to those found in relevant nuclear reprocessing flow sheets. SO3-Ph-BTBP has been shown to have little effect on either steel passivation or reductive dissolution. However, if driven cathodically into a region of hydrogen evolution at the electrode surface or conversely anodically into a region of transpassive dissolution, observed currents are reduced in the presence of SO3-Ph-BTBP, suggesting corrosion inhibition of the steel potentially through weak absorption of a SO3-Ph-BTBP layer at the metal-solution interface. The lack of any observed corrosion acceleration via complexation of Fe3+ is surprising and has been suggested to be due to the slow extraction kinetics of SO3-Ph-BTBP as a result of a requirement for a trans- to cis-conformational change before binding.

6

Wykrywanie korozji w strukturze statecznika pionowego samolotu MiG-29

80%

Synaszko P. , Dragan K. , Bochenek D. , Sałaciński M.

|

2010

|

tom nr 4

CD-CD

PL

Artykuł przedstawia problem wykrywania korozji w nakładkach mocowania statecznika pionowego samolotu MiG-29. W celu zapewnienia dostępu do badanych powierzchni niezbędny był demontaż stateczników pionowych. Autorzy przedstawili część wyników badań, zaprezentowali podejście do badań, oraz wysunęli propozycję usprawnienia badań w przyszłości wykluczając konieczność demontażu stateczników.

EN

The article is showing the problem of detecting the corrosion in interface of fixing an vertical stabilizer of MiG- 29. Disassembly of vertical stabilizers was necessary for providing acces to inspected surfaces. Authors described the part of results, they presented the approach of examinations, as well as they put the proposal to other technique examinations forward in the future excluding the necessity of disassembly of stabilizers.

7

Non-Destructive Inspection of Anti-Corrosion Protective Coatings Using Optical Coherent Tomography

80%

Antoniuk P. , Strąkowski M. , Pluciński J. , Kosmowski B.

|

8

Corrosion behaviour of AISI 316L steel in artificial body fluids

80%

Kajzer W. , Krauze A. , Marciniak J.

|

2008

|

tom Vol. 31, nr 2

247-253

EN

Purpose: The paper presents the comparison of corrosion resistance of AISI 316L stainless steel in variouscorrosive media such as artificial urine, Tyrode's physiological solution and artificial plasma. Design/methodology/approach: The tests were carried out on samples of the following surfaces: grinded-average roughness Ra=0.31 μ m and electropolished and chemically passivated average roughness Ra=0.10 μ m. The corrosion tests were realized by recording of anodic polarization curves with the use of the potentiodynamic method. The VoltaLab ® PGP 201 system for electrochemical tests was applied. The tests were carried out in electrolyte simulating urine (pH=6-6.4), Tyrode's physiological solution (pH=6.8-7.4) and plasma (pH=7.2-7.6) at the temperature of 37± 1° C. Findings: Surface condition of AISI 316L stainless steel determines its corrosion resistance. The highestvalues of breakdown potentials were recorded for all electropolished and chemically passivated samples in allsimulated body fluids. The highest values of anodic current density were recorded for samples tested in artificialurine, the lowest values were recorded for samples tested in Tyrode's physiological solution. Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the AISI 316L stainless steel. Practical implications: On the basis of the obtained results it can be stated that stainless steel meets the basic biocompatibility criteria and can be applied in reconstruction surgery, operative cardiology and urology. Originality/value: The paper presents the influence of various corrosive media simulating human body fluids on corrosion resistance of AISI 316L stainless steel.

9

Synthesis and characterisation of thin cerium-based oxide films by celd on zinc metal

80%

Poupard S. , Pedraza F. , Creus J.

|

2007

|

tom Vol. 7, nr 2(12)

300-307

EN

The restriction ban of Cr(VI) based treatment to enhance corrosion resistance of Zn and Zn-alloy coatings requires the development of an environmental friendly alternative process. This study is therefore focused into the synthesis of new treatments based on thin cerium oxide (ceria) films through a cathodic electrodeposition (CELD) process. The surface finishing of the Zn substrates, the electrolyte composition and the deposition parameters are systematically studied to obtain uniform thin ceria layers of diverse microstructures and compositions. Among them, the most homogeneous deposits will be immersed in a stirred and aerated 0.5 mol.L-1 NaCl solution in order to examine the protective ability of these thin cerium-based layers through electrochemical measurements.

10

Failure analysis and predictive maintenance of aircraft components

80%

Eliaz N.

|

2007

|

tom Vol. 7, nr 2(12)

13-25

EN

Implementation of routine condition monitoring techniques, failure analysis protocols and complementary specific research and development (R&D) activities is valuable in preventing failure recurrence. Ferrography is a common technique for condition monitoring, in which small (wear) particles are isolated on a glass slide based upon the interaction between an external magnetic field and the magnetic moments of the particles suspended in a flow stream. Here, the application of ferrography in monitoring the health of aircraft assemblies is reviewed. In addition, several definitions of important terms related to failure analysis are provided, and a recommended failure analysis protocol is discussed. Finally, several case studies of aircraft components that failed due to corrosion-involving mechanisms are summarized, and an example of the application of R&D projects for improved quality assurance and prevention of failure occurrence is given.

11

Microstructural aspects of corrosion of the superston alloy after laser treatment

80%

Majkowska B. , Skalski I. , Serbiński W.

|

2007

|

tom Vol. 7, nr 2(12)

141-146

EN

Results of laser treatment at cryogenic conditions and its influence on microstructure and corrosion resistance of the SUPER-STON alloy have been presented. The ship propellers made of copper alloy during exploit can degrade (corrosion, cavitation). One of the method of reducing the action effects of mentioned wear types of ships propeller can be the laser treatment at cryogenic conditions. Laser remelting was clone by the TRUMPF TLF 6000 turbo. After laser treatment the microstructure of the surface the SUPERSTON alloy was observed by scanning electron microscope. Corrosion test was made by potentiodynamic method in 3% NaCl solution. Corrosion resistance changed with parameters of the laser remelting and it was found that corrosion current density was lowest for 4000W of the rower laser beam and 0.5m/min of the scanning velocity.

12

Increase of wear resistance of movable joints working in corrosive-active media with abrasive

80%

Pichugin V. F. , Mustafin S. Y. , Senatorski J.

|

1999

|

tom Vol. 4, no spec.

179-182

EN

Micro-arc oxidizing (MAO) is one of the surface hardening methods of Al. alloys, which allows to build up principally new coatings of high quality with strong adhesion to the base metal and with improved wear resistance. Ceramic layer of Al2O3 is formed under electrochemical oxidation of the outer surface of machined part, immersed into electrolyte (KOH solution) and subjected to asymmetric AC voltage of industrial frequency. Coating thickness on the surface of D16T alloy achieves 0.3...0.4 mm, hardness - 1800...2000 HV. Friction and wear studies were performed using block and roller testing assembly under various lubricating conditions. Coefficient of friction in clay-based drilling mud was equal to 0.045 for MAO samples and 0.19 for reference steel samples; mass loss was 37× 10-4 and 347× 10-4 respectively. Friction joints operation pressures range cam be increased and service life improved by MAO technology.

13

Katodowa ochrona przed korozją podziemnych zbiorników - analiza porównawcza

80%

Wantuch A.

|

2012

|

tom R. 88, nr 12b

265-266

PL

Zdarza się, że rozważania teoretyczne dotyczące ochrony katodowej nie są zgodne z danymi eksperymentalnymi. W niniejszym artykule omówiono problemy zagrożenia korozyjnego struktur podziemnych i ochrony katodowej oraz przedstawiono porównanie wyników obliczeniowych z pomiarowymi przy wyznaczaniu gęstości prądu i potencjału w systemach ochrony katodowej.

EN

Sometimes, the theoretical considerations concerning the cathodic protection are incompatible with experimental data. The present article describes problems relating to corrosion hazards and cathodic protection and comparison of calculated and experimental results of the current density and potential in cathodic protection systems

14

Ocena wpływu małego stopnia korozji próbek na właściwości mechaniczne stali niskostopowej

80%

Glinicka A. , Kruk M.

|

2010

|

tom nr 6

42-44

15

Korozja ultradrobnoziarnistych stopów aluminium serii 2xxx i 7xxx

80%

Nowak M. , Opyrchał M. , Motyka M. , Płonka B. , Rajda M.

|

2010

|

tom R. 55, nr 7

514-517

PL

W artykule przedstawiono własności korozyjne ultradrobnoziarnistych stopów aluminium serii 2xxx oraz 7xxx w odniesieniu do ich grubokrystalicznych odpowiedników. Ocena własności korozyjnych dokonana została w oparciu o wyniki laboratoryjnych badań korozyjnych w środowisku obojętnej mgły solnej oraz badań elektrochemicznych. Wykonano również badania podatności materiałów na korozję warstwową oraz naprężeniową. W pracy tej określono rodzaje korozji, jakim ulegają analizowane materiały ultradrobnoziarniste oraz wielkość korozji. Tego typu badania mające na celu scharakteryzowanie nowych materiałów pod względem odporności na korozję są niezbędne przy wprowadzaniu nowych wyrobów do użytku.

EN

The paper presents ultrafinegrained corrosion properties of aluminium alloys of 2xxx and 7xxx series in relation to their coarse grained counterparts. Evaluation of corrosion properties was carried out based on the laboratory results of corrosion in artificial atmosphere (neutral salt spray) and electrochemical testing. Performed susceptibility testing of materials on layer corrosion and stress corrosion cracking also. The paper identifies types of corrosion and the volume of corrosion analyzed ultrafinegrained materials. This type of research are made to characterize new materials for resistance to corrosion is essential for introducing new products to use.

16

Filter debris analysis

80%

Raadnui S.

|

2006

|

tom Vol. 11, no 4

751-754

EN

Due to normal friction, wear, corrosion, etc., it is not uncommon to find small amounts of debris in a used filter element. Ferrous metals may indicate wear of the steel parts. Principally, one can use a magnet to differentiate between ferrous and non-ferrous metals found in the used filter element. Further, the analyst should use microscopic examination of debris morphology characteristics such as shape, size, color, surface texture, thickness ratio and edge detail as their principal analysis technique. The wear debris morphological analysis technique has been applied for monitoring the condition of oil-lubricated machinery for quite sometimes. However, most the works reported to date have been focused on used oil debris analysis. In this particular work, systematic filter debris analysis is reported.

17

Photochemical screening and corrosion inhibition of Poupartia birrea back extracts as a potential green inhibitor for mild steel in 0.5 M H2SO4 medium

80%

Louis H. , Japari J. , Sadia A. , Philip M. , Bamanga A.

World News of Natural Sciences

|

2017

|

tom 10

95-100

EN

Corrosion of metals is a serious environmental problem and has been given much attention in the oil and gas industries. In several industrial processes (acid cleaning and etching, removal of rust and scale), metal surfaces are often made to come in contact with acids. In the present study, an attempt was made to examine Poupartia birrea (P. birres) back extract as a potential green corrosion inhibitor for mild steel in a 0.5 M H2SO4 medium, using the weight loss determination method. The results of our work indicate that highest inhibition efficiency exhibited by Poupartia birrea is 70%. The inhibiting effect of the studied extract could be attributed to the presence of phytochemical constituents present in the extract that are adsorbed on the surface of the mild steel. The plant extract can, hence, be considered as being eco-friendly and an effective green corrosion inhibitor for mild steel exposed to an acid medium.

18

Results of acoustic emission tests of corrosion protection degree of ship steel tanks covered by means of protective coatings. (Phase I)

80%

Bugłacki H. , Eichert P.

|

2008

|

tom S 1

35-41

EN

This paper presents methods and results of the 1st series of tests of acoustic emission (AE) signals, aimed at assessing degree of corrosion protection of a tank made of hull structural steel, protected by means of a protective coating combined from polyurethane layer and concrete filler. The tests were carried out in compliance with a method specially elaborated for application to the work in question. In the method were used requirements of the standards in force, as well as experience gained during realization of the research project CORRSHIP, included in 5th Frame Program of European Union. The application of the AE method to detect and localize corrosion sources during exposure of specimens to corrosive mixture confirmed its high usefulness for the carried-out tests on corrosion protection effectiveness of new types of protective coatings.

19

Wybrane efekty korozji rur stalowych w płaszczu ochronnym

80%

Glinicka A. , Wasilewska K.

|

2009

|

tom nr 6

CD-CD

PL

Niniejsza praca dotyczy problemu korozji rur ze stali węglowej zabezpieczonych powłoką ochronną z polipropylenu. Przygotowano cztery grupy próbek o różnych średnicach i długościach. Badania przeprowadzono w komorze mgły solnej przez okres 720 godzin. Obliczono ubytek masy oraz prędkość korozji dla poszczególnych grup próbek. Wyniki badań oraz obliczone wartości zestawiono w tabeli oraz przedstawiono graficznie za pomocą wykresów. Stwierdzono, że szybkość korozji nie jest proporcjonalna do średnicy rury i pola powierzchni próbki stykającej się z środowiskiem agresywnym.

EN

This work deals with problems of corrosion of carbon steel tubes indemnified with protective coating with polipropylen. There was prepared four groups of samples, with different diameters and lengths. The research was carried out in a salt mist chamber over 720 hours. The researchers calculated waste of mass and corrosion speed for each group of samples. The results and collated values are presented in tables and graphically on diagrams. It was noticed, that corrosion speed is not proportional to tube diameter and surface area of sample in aggressive environment connecting.

20

Properties of Thermal Spraying Ni-Al Alloy Coatings

80%

Starosta R.

|

2009

|

tom Vol. 9, nr 1(19)

30-40

EN

The article presents the results of testing of Ni-Al alloy coatings with different chemical and phase composition, which might replace currently used electrolytic chromium coatings. Crust chromium coatings are suitable for reconditioning of machine parts because of their very good maintenance properties. However, due to toxicity of electrolytic chromium bath, their application tends to be restricted. Thermal flame and plasma spraying technologies were chosen for nickel aluminium coating application. Obtained coatings were distinguished by significant porosity of structure and surface roughness. The thickness of coatings ranged from 440 to 683 ěm. Microhardness of coatings was not related to applied metal plating technology but to chemical and phase composition. The more aluminium content in coating the harder the coatings were. The hardness of coatings which resulted from NiAl phase was ca 250 HV 0.04. Flame spray coatings are distinguished by nearly 10 times higher corrosion current density compared comparatively with plasma spray coatings. The value of corrosion potential is influenced by structure and chemical composition of coatings. The more aluminium content caused the lower Ecorr.