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通过人工海水的盐雾干-湿实验模拟海洋大气环境,研究了Sn-0.7Cu和Sn-0.7Cu-0.01Ga合金的腐蚀行为.采用SEM和XPS分析了合金表面腐蚀形貌及腐蚀产物成分,采用XRD分析了腐蚀产物的结构.结果表明:Sn-0.7Cu合金腐蚀初期发生明显的点蚀,点蚀易于在富Cu区萌生,且以触须状向外扩展;腐蚀后期腐蚀产物分层,龟裂且易于剥落,此时腐蚀产物不具有保护性.XRD分析表明.腐蚀产物主要为非晶态Sn的氧化物,同时有少量的SnCl_2·2H_2O;微量元素Ga能显著提高Sn-0.7Cu合金的抗盐雾腐蚀性能.XPS分析表明,微量元素Ga在表面存在明显的富集行为,并形成一种致密的保护性氧化膜,它是提高Sn-0.7Cu合金抗盐雾腐蚀性能的主要原因.
The corrosion behavior of Sn-0.7Cu and Sn-0.7Cu-0.01Ga alloys was studied by the salt spray dry-wet test of artificial seawater, and the corrosion morphology and composition of corrosion products were analyzed by SEM and XPS. The structure of the corrosion products was analyzed by XRD. The results show that pitting corrosion occurs obviously in the early stage of corrosion of Sn-0.7Cu alloy, pitting easily erupts in the Cu-rich region and outwardly in the shape of whisker. After the corrosion, And easily peel off, the corrosion products are not protective at this time.XRD analysis shows that the corrosion products are mainly amorphous Sn oxides with a small amount of SnCl 2 · 2H 2 O and trace elements Ga can significantly improve the corrosion resistance of Sn-0.7Cu alloys XPS analysis shows that there is a clear enrichment behavior of Ga on the surface and a dense protective oxide film is formed, which is the main reason for improving the salt spray corrosion resistance of Sn-0.7Cu alloy.