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1

Influence of PAA on the Microstructure and Corrosion Resistance of Electrophoretically Deposited SiO2 and Ni/SiO2 Coatings on X2CrNiMo17-12-2 Steel

Ratajski T., Kalemba-Rec I., Dubiel B.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 4

2073--2079

EN

The effect of anionic surfactant in the form of polyacrylic acid (PAA) on the electrophoretic deposition of the SiO2 and Ni/SiO2 coatings on X2CrNiMo17-12-2 stainless steel was examined. Parameters of the process, such as chemical composition of the suspensions, voltage between the electrodes and the deposition time were experimentally selected. Zeta potential measurements showed a beneficial effect of polyacrylic acid on the SiO2 and Ni particles stability in ethanol. Scanning and transmission electron microscopy studies revealed that the microstructure of the coatings obtained from the suspensions containing polyelectrolyte is more homogenous and has less amount of desiccation cracks on the surface. The results of the polarization tests have shown that addition of anionic surfactant improves also corrosion resistance of the coatings in 3.5% NaCl solution.

2

Influence of polyethylenimine on the electrophoretic deposition of SiO2 and Ni/SiO2 coatings on 316L stainless steel

Ratajski T., Kalemba-Rec I., Dubiel B.

Inżynieria Materiałowa

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2016

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Vol. 37, nr 4

184--189

EN

The aim of the present work was to investigate the influence of polyethylenimine, a cationic polymer surfactant, on the microstructure and corrosion resistance of SiO2 and Ni/SiO2 coatings electrophoretically deposited on 316L stainless steel. The relationship between zeta potential and pH of the ethanol-based suspensions of SiO2 and Ni powder particles with addition of polyethylenimine was determined. The parameters of electrophoretic deposition process (applied voltage, time, distance between electrodes) were developed to prepare good quality coatings. Cathodophoresis from suspensions with polyethylenimine addition was performed with slightly lower applied voltage and time as compared to anodic deposition of coatings without surfactant. The microstructure of the coatings, their surface roughness and adhesion to the substrate were investigated. The protective behaviour of the coatings was studied by potentiodynamic measurements in 3.5% NaCl water solution. The microstructure and properties of the coatings were compared with those obtained without polyethylenimine addition. It was determined that the microstructure of SiO2 and Ni/SiO2 coatings deposited from suspensions containing polyethylenimine was more uniform and contained smaller amount of cracks and voids than the coatings achieved without polyelectrolyte. It was also observed that the quality improvement of the coatings deposited on 316L steel due to addition of polyelectrolyte with binding properties leads to increase of their corrosion resistance.

PL

Celem pracy było zbadanie wpływu polietylenoiminy (PEI) na stabilność zawiesin na bazie etanolu używanych do osadzania elektroforetycznego (EPD) powłok SiO2 i nanokompozytowych powłok Ni/SiO2 na stali 316L. Zbadano mikrostrukturę powłok oraz topografię powierzchni, przyczepność do podłoża i odporność na korozję w 3,5% roztworze NaCl.

3

Manufacturing, Microstructure and Corrosion Resistance of Electrophoretically Deposited SiO2 and Ni/SiO2 Coatings On X2CrNiMo17–12–2 Steel

Ratajski T., Kalemba-Rec I., Dubiel B.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 2B

1221--1227

EN

The SiO2 and Ni/SiO2 coatings were electrophoretically deposited on X2CrNiMo17-12-2 steel using ethanol-based suspensions of the SiO2 and Ni powders. The influence of the zeta potential and concentration of the suspensions, the applied voltage and deposition time on the quality of the coatings was studied. Microstructure of the plan-view and cross sections of the coatings was investigated using scanning electron microscopy. The plan-view images revealed the uniform microstructure of the coatings with sporadically observed cracks, pores as well SiO2 and Ni agglomerates. On the cross-sections, the Cr2O3 layer, resulted from oxidation of the substrate during sintering of the coatings was observed. The polarization tests have shown that SiO2 and Ni/SiO2 coatings improve the corrosion resistance of the X2CrNiMo17-12-2 steel in 3.5% NaCl aqueous solution.

4

Powłoki optyczne na bazie SiO2 otrzymywane z zastosowaniem metody zol-żel

Żelazowska E., Marczewska A., Rybicka-Łada J., Sacha S., Brzezicki J.

Szkło i Ceramika

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2014

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R. 65, nr 1

8--12

PL

Powłoki złożone w głównej mierze z SiO2 z dodatkami modyfikującymi właściwości zostały otrzymane z zastosowaniem metody zol-żel. Roztwory prekursorów na bazie ortokrzemianu etylu TEOS z dodatkami w postaci kwasu krzemowego, 1,2-glikolu propylenowego, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), MgF2, acetyloacetonianów (Zr, Ti, Sn, Ce, W, Mo, Co) w rozpuszczalnikach organicznych były nanoszone na powierzchnię szkła sposobem zanurzeniowym lub natryskowym. Otrzymane powłoki były w większości porowate i w badaniach metodami GID-XRD oraz SEM/EDS wykazały charakter nanostrukturalny polikrystaliczny lub amorficzny. Porównanie uzyskanych parametrów spektrofotometrycznych wskazuje, że zastosowane materiały prekursorów i procedury powlekania pozwalają uzyskać właściwości optyczne w znacznym stopniu zbliżone do popularnych komercyjnych ochronnych filtrów dla obiektywów aparatów fotograficznych.

EN

Thin film SiO2 (Tetraethyl orthosilicate, TEOS) based coatings with or without organic additives (1,2-Propylene glycol, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) and doped with metal acetyloacetonates from a group of (Zr, Ti, Sn, Ce, W, Mo, Co) in solutions with organic solvents, and/or MgF2, were obtained on glass by dipping or spray mode. The coatings were examined by GID-XRD, SEM/EDS and UV/VIS/NIR spectroscopy methods and revealed morphology strongly dependent on the composition of zols and heat treatment procedures. The coatings with spectrophotometric parameters similar or better than those of commercial filter glasses for digital cameras were obtained.

5

Wpływ cienkich powłok SiO2 oraz TiO2 otrzymywanych metodą zol-żel na właściwości pary ślizgowej metal-polimer

Ptak A., Tkaczyk M., Donesz-Sikorska A.

Tribologia

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2012

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nr 3

159-166

PL

Badania tribologiczne zostały przeprowadzone dla cienkich powłok jednowarstwowych oraz trójwarstwowych SiO2 i TiO2 otrzymanych metodą zol-żel na podłożu metalicznym przy użyciu techniki dip-coating. Wcześniejsze badania [L. 1] (spektroskopia ramanowska, SEM, rentgenowskie pomiary dyfrakcyjne i inne) wykazały, iż powłoki otrzymywane tą metodą posiadają odpowiednie właściwości wymagane do zastosowania ich w przemyśle medycznym, chemicznym bądź spożywczym. W niniejszej pracy podjęto próbę analizy wpływu cienkich powłok otrzymanych metodą zol-żel na współczynnik tarcia kinetycznego dla trzech różnych wartości nacisku jednostkowego (0,1; 0,25; 0,5 MPa)] dla pary ślizgowej typu metal–polimer. Badania przeprowadzono na standardowym stanowisku tribologicznym typu pin-on-disc w warunkach tarcia technicznie suchego. Po badaniach tribologicznych dokonano również mikroskopowej oceny stanu powierzchni powłok.

EN

Tribological tests were carried out for single- and triple-layered SiO2 and TiO2 thin coatings obtained on metallic substrates by the sol-gel method using the dip-coating technique. Previous studies (Raman spectroscopy, SEM-EDS, salt chamber tests, electrochemical studies, strength tests)] showed that the coatings obtained by this method have appropriate physicochemical and mechanical properties that are adequate to use them in the food industry and chemical industries or the medical professional. The goal of this study was to analyse the impact of thin coatings obtained by the sol-gel method on the coefficient of kinetic friction for three different values of pressure (0.1, 0.25, 0.5 MPa)] for the sliding pair of metal-polymer. The study was conducted on a standard tribological rig "pin-on-disc" with dry friction conditions. Microscopic evaluation of surface coatings after the tribological tests was also performed.