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研究低熔点金属Sn对新加工和酸洗钝化的304奥氏体不锈钢的污染,并通过300℃高温水浸泡170h的实验考察Sn污染对304不锈钢腐蚀性能的影响。结果表明:Sn污染304不锈钢新加工表面污染产物为块状和针状的(Fe,Cr)Sn2,与304钢冶金结合,而对于酸洗钝化304不锈钢,Sn只是简单的机械附着。高温水腐蚀后,Sn污染的样品整个表面出现较多且密集的腐蚀氧化,物新加工的304钢稀疏生长出长杆状的氧化物,酸洗钝化的304钢很少被氧化的迹象,Sn污染降低了奥氏体不锈钢的耐蚀性。
The effects of Sn contamination on the corrosion resistance of 304 stainless steel were investigated by experiments on the newly machined and pickled passivated 304 austenitic stainless steel with low melting point metal Sn. The results show that the contaminated products of Sn-contaminated 304 stainless steel are massive and needle-shaped (Fe, Cr) Sn2, which is combined with the metallurgy of 304 steel. However, for pickling and passivation of 304 stainless steel, Sn is only a simple mechanical attachment. After high-temperature water corrosion, Sn-contaminated samples appear more and intensive corrosion oxidation on the whole surface. Newly-processed 304 steel sparsely grows rod-shaped oxides, while pickled passivated 304 steel is less oxidized. Sn contamination reduces the corrosion resistance of austenitic stainless steel.