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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 effects of CTAB on the corrosion behavior of AZ31 magnesium alloy in 3.5% NaCl solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The surface corrosion products were observed by scanning electron microscopy The results showed that the corrosion rate of magnesium alloy decreased with the addition of 2000 ~ 3500 mg / L CTAB in NaCl solution, and the corrosion rate of magnesium alloy was the lowest with CTAB concentration of 3500 mg / L. This is mainly due to the adsorption of CTAB on the magnesium alloy surface, which hinders the anodic dissolution process. Meanwhile, CTAB reduces the number of micro-defects in the corrosion product film, reduces the corrosive medium infiltration channels and increases the charge transfer resistance, so that the magnesium The corrosion resistance of the alloy is improved.