Corrosion behaviour of carbon S-phase created on Ni-free biomedical stainless steel

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• 作者：Dennis Formosa^a ; Ralph Hunger^b ; André ; Spiteri^a ; Hanshan Dong^c ; Emmanuel Sinagra^d ; Joseph Buhagiar^a ; ^{joseph.p.buhagiar@um.edu.mt}
• 关键词：S-phase ; Expanded austenite ; Nickel free austenitic stainless steel ; Kolsterising ; Crevice and pitting corrosion ; Intergranular corrosion
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 期刊代码：106_02578972
• 类别：ms
• 出版时间：15 April, 2012
• 卷：206
• 期：16
• 页码：3479-3487
• 文件大小：1928 K

摘要

Following the success of forming a carbon S-phase (expanded austenite) surface layer on medical grade Ni-free austenitic stainless steel by DC plasma carburising, the established commercial carburising process Kolsterising庐 was performed on both Ni-containing (AISI 304) and Ni-free austenitic stainless steels. While the Ni-containing stainless steel responded very well to Kolsterising庐, the Ni-free alloy did not. The carbon absorption and the hardness of the Kolsterised庐 Ni-free alloy are inferior to Kolsterised庐 AISI 304 Ni-containing stainless steel, however, the hardness of the untreated Ni-free alloy was doubled by Kolsterising庐. The response of both Kolsterised庐 Ni-free and Ni-containing alloys to pitting, crevice corrosion and intergranular corrosion resistance was similar. From this work it can be concluded that the Kolsterised庐 austenitic stainless steels do not suffer from intergranular corrosion but are susceptible to intragranular pitting when tested in boiling sulphuric acid and copper sulphate solution. It was also observed that Kolsterising庐 improves significantly the pitting and crevice corrosion resistance of the alloys used in this study.