Studies on Corrosion Behavior of Ceramic Sprayed Stainless Steels (Report I) : Electrochemical Approach on Ceramic Sprayed Coatings(Materials, Metallurgy & Weldability)

概要

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The natural potential and natural current of the plasma sprayed ceramic coating films and stainless steels with various surface treatments themselves in 3.5% NaCl solution were separately measured. The potential difference between them was regarded as an important criterion for judging the corrosion behavior of ceramic sprayed base metals. And so a simple method for selecting the proper composition of sprayed coatings was suggested. The high Al_2O_3-content coatings of Al_2O_3-TiO_2 system were affirmed to be more beneficial to corrosion resistance and striving for reducing porosity would be the key to use such coatings successfully. Oppositely, the coatings sprayed with high TiO_2-content powders were referred to be incommendable, though the porosity might be lowered to an extent. However, the natural potential as well as the natural current of the samples sprayed with high Al_2O_3 ceramic powders depended on those of the base metals themselves, and those of the samples sprayed with high TiO_2 ceramic powders depended on those of the coating films themselves.
大阪大学の論文