LY12铝合金在模拟酸雨溶液中的阻抗谱研究

中国腐蚀与防护学报, 2003, 23(3): 167-170. doi: 10.3969/j.issn.1005-4537.2003.03.009

LY12铝合金在模拟酸雨溶液中的阻抗谱研究

安百刚 ^1, , 张学元 ^2, , 宋诗哲 ^3, , 李洪锡 ^4, , 韩恩厚 ^5,

1.天津大学,天津,300072;中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳,110016

2.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳,110016

3.天津大学,天津,300072

4.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳,110016

5.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳,110016

基金项目: 国家重点基础研究发展计划(973计划)(19990650) 国家自然科学基金(50101011)

关键词：模拟酸雨 , LY12铝合金 , 阻抗

A STUDY OF ELECTROCHEMICAL IMPEDANCE SPECTRUM FOR CORROSION BEHAVIOR OF LY12 ALUMINUM ALLOY IN SIMULATED ACID RAIN

利用电化学阻抗谱和极化曲线方法,研究了模拟酸雨溶液pH值对LY12铝合金腐蚀行为的影响.结果表明,当模拟酸雨溶液pH小于3.1时,LY12铝合金的腐蚀电位随pH值的升高而变负;当溶液pH大于3.4时,LY12铝合金的腐蚀电位随pH值升高而变正.在pH小于3.4的模拟酸雨溶液中,LY12铝合金的表面膜发生溶解,随着浸泡时间延长,膜厚度降低,膜阻抗降低,LY12铝合金的腐蚀速率升高.而在pH大于3.8溶液中,LY12铝合金的表面膜厚度基本不随浸泡时间发生明显变化,随浸泡时间增加,膜阻抗增大,LY12铝合金的腐蚀速率降低.从铝合金表面膜特性和离子吸附及腐蚀产物等方面,对实验结果进行了讨论.

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