在９０℃含Ｃｌ－碱性溶液中所研究钢种的电化学行为表明：００Ｃｒ１８Ｎｉ５Ｍｏ３Ｓｉ２（１８－５）双相不锈钢耐一般腐蚀和孔蚀性能较０Ｃｒ１８Ｎｉ９Ｔｉ（１８－ＳＴｉ）奥氏体不锈钢更佳．碱液中的游离ＮＨ３、ＣＯ３２－和ＨＣＯ３－有缓蚀作用，Ｓ２－促使材料活化．ＥＤＡＸ、ＸＰＳ及ＴＥＭ分析结果表明：两种不锈钢的表面膜均为多价的复杂氧化物膜，以ＣｒＯＯＨ、Ｃｒ２Ｏ３为主要成分．１８－５钢表面膜中Ｃｒ富集程度较１８－８Ｔｉ钢高，膜的致密度及稳定性亦高，膜中的ＭｏＯ３能有效提高钢的耐孔蚀性能．
The electrochemical behavior of 00Cr18Ni5Mo3Si2 (18-5) duplex stainless steel in chloride-containing alkaline solution at 90 ℃ was investigated. The results showed that general and pitting corrosion resistance of the 18-5 steel was superior to that of OCr18NigTi (18-8Ti) austenitic stainless steel. In alkaline solution,NH3 (free), CO32- and HCO3- acted as corrosion inhibitors for 18-5 steel, while S2- activated the steel. The surface films were analysed by EDAX, XPS and electron diffraction, The results obtained are summarized as follows. The surface films on both the steels were complex multi-Valence chide films, consisting mainly of CrOOH and Cr2O3. The Cr-enrichment in the film on the 18-5 steel was more than that on the 18-8Ti steel. The surface film on the 18-5 steel was more compact and steady. MoO3 in film effectively enhanced the pitting corrosion resistance of the 18-5 steel.
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