采用动电位极化和电化学阻抗等方法检测了十六烷基三甲基溴化铵(CTAB) 对AZ31镁合金在3.5% NaCl溶液中腐蚀行为影响的规律, 用扫描电镜观察表面腐蚀产物膜的形貌并分析其组成. 结果表明, 当NaCl溶液中加入2000~3500 mg/L CTAB时, 镁合金的腐蚀速率降低, 且CTAB浓度为3500 mg/L时, 镁合金的腐蚀速率最低. 这主要是因为CTAB在镁合金表面发生吸附, 使阳极溶解过程受阻, 同时, CTAB减少了腐蚀产物膜内的微观缺陷数量, 减少了腐蚀介质的渗入通道, 增大了电荷转移阻力, 从而使镁合金的耐蚀性得到改善.。
The effect of cetyl trimethyl ammonium bromide (CTAB) on corrosion behavior of AZ31 Mg alloy in 3.5% NaCl solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface morphology of corrosion product on Mg alloys was observed by SEM. The results showed that the corrosion rate of AZ31 Mg alloy was reduced by addition of CTAB within a concentration range of 2000~3500 mg/L in NaCl solution, and the corrosion rate in NaCl solution with 3500 mg/L CTAB was the lowest. The mechanism may be attributed to the adsorption of CTAB on the surface of Mg alloy, which blocked the anodic dissolution. Meanwhile, the corrosion product with less defects was formed on the Mg alloy by the addition of CTAB, and this reduced the path for penetration of corrosive media and increased the charge transferred resistance. Thus, the corrosion rate of Mg alloy was improved by addition of CTAB in NaCl solutions.
参考文献
| [1] | |
| [2] | |
| [3] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%