国产825合金的耐腐蚀性能研究.PDFVIP

第33 卷 第2 期 中国腐蚀与防护学报 Vol. 33 No. 2 2013 年4 月 Journal of Chinese Society for Corrosion and Protection Apr. 2013 国产825 合金的耐腐蚀性能研究 1 1 2 1 2 冯 勇 何德良 龚德胜 李 菲 吴建新 1. 湖南大学化学化工学院 长沙 410082 ； 2. 岳阳长岭设备研究所有限公司 岳阳 414014 摘要：采用腐蚀失重法、电化学测试和慢应变速率拉伸应力腐蚀研究了国产825 合金在HCl 、NaOH 和NaCl 溶 液中的腐蚀行为，并采用金相显微镜和扫描电镜（SEM）对腐蚀后的样品进行观察。结果表明，国产825 合金在 HCl 溶液中浸泡7 d 后发生了明显的腐蚀，腐蚀速率随HCl 浓度的增加而增大，而在NaOH 和NaCl 溶液中浸泡 5 个月后未发生明显腐蚀，并且在HCl 、NaOH 和NaCl 溶液中合金的腐蚀电流随溶液浓度增加而增大。慢应变 速率拉伸应力腐蚀结果表明在HCl 、NaOH 和NaCl 溶液中合金的应力腐蚀敏感性很小，因此，一般情况下不会 发生应力腐蚀开裂。 关键词：国产825 合金 腐蚀失重 电化学测试 应力腐蚀开裂 中图分类号：TG 178 文献标识码：A 文章编号：1005-4357(2013)02-0164-07 Corrosion Resistance Properties of Domestic 825 Alloy 1 1 2 1 2 FENG Yong , HE Deliang , GONG Desheng , LI Fei , WU Jianxin 1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China; 2. Yueyang Changling Equipment Research Institute Co. Ltd., Yueyang 414014, China Abstract: Corrosion behaviors of domestic 825 alloy in HCl, NaOH and NaCl solutions were studied by corrosion mass loss, electrochemical test and stress corrosion at slow strain rate. Meanwhile, the corrosion morphologies were investigated by optical microscopy and scanning electron microscopy (SEM). The results showed that the corrosion behavior of the domestic 825 alloy was not obvious after immersion in NaOH and NaCl solutions for 5 m