铜合金在中国南海深海环境下的腐蚀行为研究

金属学报, 2013, 49(10): 1211-1218. doi: 10.3724/SP.J.1037.2013.00142

铜合金在中国南海深海环境下的腐蚀行为研究

孙飞龙 ^1, , 李晓刚 ^2, , 卢林 ^3, , 万红霞 ^4, , 杜翠薇 ^5, , 刘智勇 ^6,

1.北京科技大学腐蚀与防护中心,北京,100083

2.北京科技大学腐蚀与防护中心,北京,100083

3.北京科技大学腐蚀与防护中心,北京,100083

4.北京科技大学腐蚀与防护中心,北京,100083

5.北京科技大学腐蚀与防护中心,北京,100083

6.北京科技大学腐蚀与防护中心,北京,100083

基金项目: National Natural Science Foundation of China(51171025) 国家自然科学基金资助项目51171025

关键词：铜合金 , 腐蚀 , 深海 , 实海

CORROSION BEHAVIOR OF COPPER ALLOYS IN DEEP OCEAN ENVIRONMENT OF SOUTH CHINA SEA

Keywords： copper alloy , corrosion , deep ocean , field test

通过实海暴露实验,研究了H62黄铜,QA19-2铝青铜和QSn6.5-0.1锡青铜在中国南海海域800和1200m深海环境下浸泡3a的腐蚀行为.结果表明:H62黄铜的腐蚀速率最高,达到0.042 mm/a; QA19-2铝青铜最低,仅为0.003mm/a;QSn6.5-0.1锡青铜居中,约为0.004-0.007 mm/a.分析表明:随着水深的增加,H62黄铜的腐蚀速率呈线性降低；QA19-2铝青铜和QSn6.5-0.1锡青铜的腐蚀速率随水深的增加先降低后升高,腐蚀速率的最小值出现在水深800-1200m之间.采用SEM,EDS和XRD技术,进行了腐蚀形貌观察和腐蚀产物成分及相组成分析,结果表明:H62黄铜发生了严重的脱锌腐蚀,腐蚀产物由Cu,ZnO,Zn5(OH)8Cl2H2O和Cu(OH)2H2O组成,符合溶解-再沉积机制；QA19-2铝青铜和QSn6.5-0.1锡青铜发生了脱成分(Al,Sn)腐蚀,QA19-2铝青铜的腐蚀产物由Cu2O和CuCl2组成,QSn6.5-0.1锡青铜的腐蚀产物由Cu2O,CuCl2和Cu2Cl(OH)3组成.

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