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OALib Journal期刊
ISSN: 2333-9721
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人工模拟海洋大气环境下Sn-0.7Cu无铅焊料的点蚀行为及微量Ga的影响
DOI: 10.3724/SP.J.1037.2011.00201, PP. 1327-1334
Keywords: Sn-0.7Cu,点蚀,盐雾腐蚀,无铅焊料
Abstract:
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SnCl2？2H2O;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.
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