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| THE INFLUENCE OF NITROGEN ON PITTING AND CREVICE CORROSION RESISTANCE OF TYPE 25-6Mo3 DUPLEX STAINLESS STEEL |
| Cui Jiaolin; Xuo Jingyi and Wu Jiu~*(Beijing Institute of Chemical Technology) *(Central Iron and Steel Research Institute) |
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Abstract The influence of nitrogen on pitting and crevice corrosion resistance of the type 256Mo3 duplex stainless steel was evaluated. It was found that the resistance to both pitting and crevice corrosion increased with increasing nitrogen content, and that the critical crevice corrosion temperature was related to the nitrogen content of steel as follows: CCT(℃)=17.3+78.4N％wt. The more the nitrogen content of steel, the higher the enrichment of nitrogen in the surface layers. The maximum nitrogen concentration was about 14 times its bulk level for the steel containing 0.28％N; pitting sites were transferred from γ phase into α phase with the nitrogen content increasing to more than 0.096％. The simulated occluded cell(OC) testing indicated that the more the nitrogen content, the larger the pH value of solution in OC by the end of the test. The ammonium ions in solution were detected with Nessler reagent for material containing 0.28％ nitrogen, proving the inhibiting-effect of nitrogen on the duplex stainless steel. So it is concluded that the role of nitrogen is due to the enrichment of austenitic phase and inhibiting-effect by proton consuming reaction leading to a reduction of local acidification in OC.
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Received: 25 August 1992
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Cite this article:
Cui Jiaolin; Xuo Jingyi and Wu Jiu~*(Beijing Institute of Chemical Technology) *(Central Iron and Steel Research Institute). THE INFLUENCE OF NITROGEN ON PITTING AND CREVICE CORROSION RESISTANCE OF TYPE 25-6Mo3 DUPLEX STAINLESS STEEL. J Chin Soc Corr Pro, 1992, 12(4): 291-300.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I4/291
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