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Hybrid PMMA–silica anticorrosive coatings for stainless steel 316L

2012; Taylor & Francis; Volume: 47; Issue: 2 Linguagem: Inglês

10.1179/1743278211y.0000000035

1743-2782

Jenaro Leocadio Varela‐Caselis, E. Rubio, Víctor Manuel Castaño Meneses,

Hydrogen embrittlement and corrosion behaviors in metals

316L stainless steel in environments with high chlorine content suffers localised corrosion. In this study, hybrid sol–gel based anticorrosive protective coatings were developed and deposited on 316L stainless steel substrates. The effect of incorporating different compositions of silica in polymethylmethacrylate (PMMA) sol–gel coatings on the aqueous corrosion resistance of 316L stainless steel in 5 wt-% aqueous NaCl electrolyte was evaluated. Analysis shows that the coatings are uniform, crack free and well bonded to the substrate. Organic–inorganic phases exhibited good compatibility. In addition, the adhesion strength of PMMA–silica hybrid coatings to the surface was found to be higher than the pure system PMMA coating. The anticorrosive properties were evaluated by electrochemical noise and visual test according to ASTM D610 (rusting degree) and ASTM D714 (blistering degree). Coatings with 75 wt-%PMMA–25 wt-% silica possessed the best corrosion performance among the coating specimens.