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OALib Journal期刊
ISSN: 2333-9721
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Cu含量对一种新型Al-Mg-Si合金晶间腐蚀的影响
, PP. 129-133
Keywords: Cu,Al-Mg-Si合金,晶间腐蚀
Abstract:
采用浸泡腐蚀实验和电化学实验研究了Cu含量变化和热处理条件对一种新型舰载飞机用Al-Mg-Si合金的耐腐蚀性能的影响.结果表明，添加Cu后，实验合金的腐蚀方式由点蚀转变为晶间腐蚀，且腐蚀程度随Cu含量的增加而严重；与欠时效和过时效状态相比，T6态对晶间腐蚀较敏感，与晶界析出相的连续分布有关.电化学实验表明，所有实验合金均较快进入钝态；随Cu含量的增加，实验合金的自腐蚀电位向正向变化，腐蚀电流密度增加；随时效时间的延长，点蚀电位、晶间腐蚀的临界点位和自腐蚀电位逐渐向负向变化.而点蚀电位和自腐蚀电位随时效时间呈抛物线变化，晶间腐蚀的临界电位则呈直线变化.
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