Control of the Surface Charge and Improved Corrosion Resistance of Stainless Steel by the Combined Use of Gaseous Ozone and Heat

DOI Web Site 被引用文献10件 参考文献45件

この論文をさがす

抄録

The surface charge of 316 L stainless steel particles treated at various temperatures under oxygen or gaseous ozone of 0.2 to 15% (vol/vol) was determined as a function of pH by potentiometric titration. The apparent points of zero charge (pzc’sapp) of ozone-treated stainless steel particles were situated at points corresponding to more acidic pH values compared with the pzc’sapp of oxygen-treated particles. The degree of the shift in the pzcapp of stainless steel particles depended on the ozone concentration and temperature. The combined ozone/heat treatment was found to induce the surface dehydroxylation of stainless steel particles. Cr6+ species were generated in the passive film on stainless steel particles through ozone oxidation. The generated Cr6+ species were readily dissolved into aqueous solution, whereas the amount of dissolved Cr6+ species decreased markedly by heating again at 200°C under atmospheric pressure. It was demonstrated that the situation of pzcapp and the surface charge density of stainless steel particles could be controlled, to some extent, by the combined ozone/heat treatment followed by post-ozone heat treatment. Controlling the surface charge of stainless steel particles resulted in a lower affinity for pectin adsorption. It was also shown that the combined ozone/heat treatment resulted in the formation of relatively thick and dense passive film on stainless steel particles, thereby giving a higher resistance to surface dissolution in aqueous solution than oxygen-treated particles.

収録刊行物

  • 表面技術

    表面技術 54 (12), 1034-1042, 2003

    一般社団法人 表面技術協会

被引用文献 (10)*注記

もっと見る

参考文献 (45)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ