合金元素对双相不锈钢2101耐点蚀性能的影响

Effect of alloying elements on pitting corrosion resistance of the 2101 duplex stainless steels

研究了合金元素对双相不锈钢2101耐点蚀性能的影响规律。结果显示,2101系列合金的浸泡点蚀腐蚀速率在1.9～7.0 g/(m2.h)之间,与304不锈钢在同一数量级;Mo是提高2101系双相不锈钢耐腐蚀性的关键元素,而N对耐腐蚀性的影响不大;点蚀起源和Thermo-Calc计算结果显示2101成分体系中,铁素体相是耐点蚀性较弱相,提高铁素体相耐蚀性是提高合金整体耐蚀性的关键;当Cr含量固定在21.5%时,Mo作为铁素体形成元素将在铁素体相中富集,提高铁素体相的耐点蚀性能,从而提高合金整体耐蚀性。

The effect of alloying elements on pitting corrosion resistance of the 2101 duplex stainless steels（DSS） was investigated.The test results show that the pitting rate of the 2101 series（soaked） varies between 1.9-7.0 g/（m2·h）,at the same order of magnitude of the 304 stainless steel.Molybdenum（Mo） is a critical element to enhance the corrosion resistance of the DSS 2101,whereas nitrogen（N） has a minor influence.The pitting causes and the Thermo-Calc simulation results indicate that as the ferritic phase is inferior in corrosion resistance,to improve its corrosion resistance will be the key to enhance the total corrosion resistance of the DSS 2101.When the Cr content is fixed to be about 21.5%,Mo,a ferrite-former,is enriched in the ferritic phase,which can improve the ferritic phase＇s pitting resistance so as to improve the DSS 2101＇s total corrosion resistance.