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本文主要研究了在氯化物介质中氮对00Cr18Ni5Mo3Si2(18-5)双相不锈钢耐孔蚀和耐应力腐蚀性能的影响。结果表明,双相不锈钢中奥氏体相的耐孔蚀性较铁素体相差,故优先受到腐蚀,氮使钢的耐孔蚀性提高,实际上是增加了奥氏体相的耐孔蚀性。研究还表明,氮增加18-5钢在40％CaCl_2溶液中的应力腐蚀敏感性,是由于位错的共平面性滑移引起钝化膜的局部破裂。在中性的25％NaCl+1％K_2Cr_2O_7溶液中,应力腐蚀裂纹始于孔蚀坑,含氮的18-5钢耐孔蚀性提高,从而导致钢的耐应力腐蚀性能的增加。利用俄歇电子谱分析了钝化后钢的表面膜成分,结果表明氮在膜中靠基体侧富集,从而改善了表面膜的性能,这可能是氮提高18-5双相不锈钢耐孔蚀性能的主要原因,
This paper mainly studies the effect of nitrogen on the corrosion resistance and stress corrosion resistance of 00Cr18Ni5Mo3Si2 (18-5) duplex stainless steel in chloride media. The results show that the dual-phase stainless steel austenite phase than the corrosion resistance of ferrite phase difference, it is preferentially subject to corrosion, nitrogen to improve the pitting resistance of steel, in fact, increased resistance to corrosion of the austenite phase Sex. The study also shows that the sensitivity of nitrogen to increasing the stress corrosion of 18-5 steel in 40% CaCl 2 solution is due to the localized rupture of the passive film due to the coplanar slip of the dislocations. In the neutral solution of 25% NaCl + 1% K 2 Cr 2 O 7, the stress corrosion cracking starts from the pits, and the corrosion resistance of the 18-5 steel containing nitrogen increases, resulting in an increase in the stress corrosion resistance of the steel. The surface film composition of the post-passivated steel was analyzed by Auger electron spectroscopy. The results show that nitrogen is enriched in the film by the substrate side, thereby improving the performance of the surface film, which may be due to the nitrogen corrosion resistance of 18-5 duplex stainless steel The main reason for performance,