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OALib Journal期刊
ISSN: 2333-9721
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新型al-mg合金的耐腐蚀性能
Keywords: 金属材料,al-mg合金,晶间腐蚀,剥落腐蚀,稳定化处理
Abstract:
？采用晶间腐蚀、剥落腐蚀实验结合扫描、透射电镜等手段观察分析腐蚀后合金的微观形貌和相结构,研究了合金元素和热变形工艺对新型al-mg合金的抗晶间腐蚀和剥落腐蚀性能的影响。结果表明:随着mg含量的增加合金在浓硝酸溶液中的腐蚀失重量增大,抗晶间腐蚀性能降低;合金中zn含量的的提高导致在晶界上形成了不连续析出的mg32(al,zn)49相,降低了合金的腐蚀失重量,提高了al-mg合金的抗晶间腐蚀性能。合金的抗腐蚀性能也受形变热处理工艺的影响,对冷变形后的合金进行适当的稳定化处理,相比单纯的冷变形可同时提高合金的抗晶间腐蚀性能与剥落腐蚀性能。冷变形后的残余应力、高位错密度以及拉长晶粒形貌都导致更多的析出相在晶界连续析出,形成网状膜,使合金的抗腐蚀性能降低。
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