中文摘要：

为了研究化学酸洗钝化在低熔点金属Sn与304不锈钢粘附过程中的作用,通过浸泡腐蚀实验分析了液态Sn与U型弯曲后的酸洗钝化不锈钢的交互作用行为,探讨了Sn粘附对不锈钢基体浸泡腐蚀性能的影响.实验结果表明:Sn与304不锈钢相互作用在界面处形成了片状(Fe,Cr)Sn2化合物冶金层,酸洗钝化处理改变了冶金结合,使液态Sn与304不锈钢界面成为直接物理接触;U型弯曲破坏了钝化膜的完整性,未能阻止Sn与不锈钢的界面冶金结合,但降低了界面化合物层的厚度.浸泡腐蚀实验结果表明,Sn粘附层促进了不锈钢基体腐蚀.

英文摘要：

To study the effect of chemical passivation film on the adherence behavior of low melting point metal Sn with 304 stainless steel, the interactions of liquid Sn with U-bending stainless steel and chemical passivation stainless steel were compared. The influence of Sn adherence on the immersion corrosion resistance of stainless steel was discussed. The results show that low melting point Sn adhered with 304 stainless steel by the formation of interfacial ( Fe, Cr ) Sn2 layer with plate-type morphology. Chemical passivation inhibited the formation of (Fe, Cr)Sn2 layer and changed the metallurgical combination to physically attachment. U-bending test destroyed the integrality of the passive film, so it could not retard the interaction of Sn with stainless steel, but it decreased the thickness of the interfacial intermetallics. The immersion corrosion experiment demonstrated that the corrosion of stainless steel substrate was significantly accelerated because of the Sn adherence.