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Enhancement of corrosion resistance of stainless steel with Zn doped silane coatings

Owczarek Edyta

Ochrona przed Korozją

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2022

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nr 12

373--377

EN

Blank silane films are not able to provide long-term corrosion protection. As is known, dopants with corrosion inhibiting properties can be added to the silane sol-gel network in order to increase their corrosion resistance. The present work investigates the protective properties of air-aged films obtained from a solution of isobutyltriethoxysilane (IBTES) doped with 0.01 mol/l and 0.1 mol/l zinc nitrate Zn(NO3)2 ∙ 6H2O prepared on an X20Cr13 stainless steel substrate. The surface morphologies, adhesion to the substrate and the corrosion resistance of the obtained films in an 0.5 M Cl− solution were examined. The experimental results showed that IBTES films doped with 0.01 mol/l zinc nitrate deposited on the surface of stainless steel had better protective properties, while those doped with 0.1 mol/l of the inhibitor had worse protective properties against local corrosion compared to blank IBTES film.

PL

Powłoki silanowe nie są w stanie zapewnić długotrwałej ochrony przed korozją. Jak wiadomo, do sieci zol-żel silanu można dodawać domieszki o właściwościach hamujących korozję w celu zwiększenia ich odporności na korozję. W pracy zbadano właściwości ochronne starzonych w powietrzu powłok otrzymanych z roztworu izobutylo- trietoksysilanu (IBTES) domieszkowanych 0,01 mol/l i 0,1 mol/l azotanu cynku Zn(NO3)2 ∙ 6H2O wytworzonych na podłożu ze stali nie- rdzewnej X20Cr13. Zbadano morfologię powierzchni, przyczepność do podłoża oraz odporność korozyjną otrzymanych filmów w 0,5M roztworze Cl−. Badania eksperymentalne wykazały, że powłoki IBTES domieszkowane 0,01 mol/l azotanu cynku osadzone na powierzchni stali nierdzewnej miały lepsze właściwości ochronne przed korozją lokalną w porównaniu z powłoką IBTES, natomiast domieszkowane 0,1mol/l inhibitora – gorsze.

2

Technology and Dielectric Properties of the KNLN Doped with Nd3+ and Pr3+ Ions

Bochenek D., Osińska K., Mankiewicz M., Niemiec P., Dercz G.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 3

1183--1188

EN

The paper presents the technology and basic properties of three compositions of lead-free ceramics: (i) (K0.44Na0.52Li0.04)NbO3, (ii) (K0.44Na0.52Li0.04)NbO3)NbO3 +0.5%mol Nd2O3 and (iii) (K0.44Na0.52Li0.04)NbO3)NbO2+0.5%mol Pr2O3. Powders of the designed compositions based on KNLN were obtained with the classic ceramic technology, as a result of solid phase synthesis, from a mixture of simple oxides and carbonates. The synthesis of ceramic powders was carried out at Ts = 900°C for ts = 4 h, while compaction by free sintering at Tsint = 1100°C for tsint = 2 h. XRD studies have shown that doping with praseodymium and neodymium promotes the formation of the tetragonal phase in the base composition (K0.44Na0.52Li0.04)NbO3)NbO3 at lower temperatures. On the other hand, microstructural tests have shown that the admixture of neodymium and praseodymium improves the sinterability of ceramic samples during the technological process; however, the ceramic samples still exhibit high porosity.

3

PZT-Type Ceramics Doped with Manganese, Antimony, Lanthanum and Tungsten - Technology and Physical Properties

Bochenek D., Niemiec P., Ćwikiel E., Goryczka T.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

827--837

EN

The work three ceramic compositions based on PbZr0.49 Ti0.51O3 doped with manganese (Mn), antimony (Sb), lanthanum (La) and tungsten (W) were obtained. The introduction of a set of admixtures was aimed at improving the sinterability of ceramic materials and optimizing its electrophysical parameters. Multi-component materials of the PZT-type with a general formula: Pb(PbZr0.49 Ti0.51)0.94 Mn0.021 Sb0.016 LayWz O3 (where y from 0.008 to 0.012 and z from 0.012 to 0.014) were prepared by the conventional mixed oxide method. After mixing and drying the powder mixtures were calcined in air at 850°C for 4 h, while densification of the powders was carried out by the free sintering method at 1150°C for 2 h. The final steps of technology were grinding, polishing, annealing and putting silver paste electrodes onto both surfaces of the samples for electrical testing. XRD, SEM, EDS, dielectric, ferroelectric, piezoelectric properties and DC electrical conductivity of the obtained ceramic compositions were carried out. X-ray tests of the crystal structure conducted at room temperature have shown that all obtained the PZT-type materials were a single phase (perovskite type) without the presence of a foreign phase. Symmetry of the crystal lattice was identified as space group P4mm. Temperature dielectric studies have shown high values of dielectric permittivity and low dielectric loss. The presented physical properties of ceramic samples based on PZT confirm their predisposition for application in modern microelectronic and micromechatronic applications.