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31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34时，LY12铝合金的腐蚀电位随pH值升高而 变正.在pH小于34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38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.
The effects that pH of simulated acid rain on corro sion behavior of LY12 aluminum alloy was investigated by electrochemical impedan ce spectrum and polarization curves.It was found that corrosion potential shifts to less noble value with increasing pH at the lower 3.1 and shifts to more nobl e value at the higher 3.4.In the solutions with pH≤3.4,the surface film of LY12 aluminum alloy was dissolved and the thickness of surface film and film resista nce decreased with immersion time,thus corrosion rate of LY12 aluminum alloy inc reased.In the solutions with pH≥3.8,the film thickness of LY12 aluminum alloy h ad no apparent change with immersion time,the film resistance increased with imm ersion time,and thus corrosion rate decreased.The results was discussed from sur face film of LY12 aluminum alloy,adsorption of anions and corrosion products.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%