论文部分内容阅读
Sn促进点蚀生长,降低钢的耐电化学腐蚀性能。研究不同钝化状态下的304不锈钢与低熔点金属Sn的交互作用机制,评价Sn对不锈钢耐电化学腐蚀性能的影响。分析无钝化,空气自钝化,化学钝化样品表面形成Fe-Sn化合物的显微形貌,用化合物厚度和所占比例表征Sn与钢相互作用程度。结果表明,无钝化膜保护的不锈钢通过形成片状的(Fe,Cr)Sn2化合物与Sn冶金结合;空气自钝化使不锈钢接触Sn的程度降低;HNO3化学钝化膜阻碍Fe-Sn的相互作用,Sn仅机械地粘附在钢表面。
Sn promote pitting growth, reduce the electrochemical corrosion resistance of steel. The interaction between 304 stainless steel and low melting point metal Sn under different passivation conditions was studied to evaluate the effect of Sn on the electrochemical corrosion resistance of stainless steel. The non-passivated, air-self-passivated and chemically passivated samples were formed into micro-morphologies of Fe-Sn compounds. The interaction between Sn and Sn was characterized by the thickness and proportion of the compounds. The results show that stainless steel with no passivation film is bonded with Sn metallurgy through the formation of flake-like (Fe, Cr) Sn2 compounds; air self-passivation reduces the contact of stainless steel with Sn; HNO3 chemical passivation film interferes with the interaction of Fe-Sn Sn only mechanically adheres to the steel surface.