邻胺基苯酚在Al-Ga-Sn-Mg/KOH环境中的抑氢作用

通过恒电流集气、稳态极化曲线、交流阻抗等电化学方法探讨了邻胺基苯酚在4 mol/L KOH溶液中对Al-0.2Ga-0.1Sn-1Mg的自腐蚀抑氢作用,分析了其作用机理.结果表明：铝合金在强碱性介质中的自腐蚀析氢呈现出典型的正差异效应,自腐蚀严重.由于苯环、胺基、羟基等基团的存在使得邻胺基苯酚易在金属的表面吸附,减少了OH-与金属表面接触的机会,析氢量降低,自腐蚀程度减轻,但铝阳极的活性没有降低,正差异效应的规律也没有改变,是碱性介质中铝阳极的良好添加剂.

INHIBITING H2- EVOLUTION FOR O- AMINOPHENOL ON THE SYSTEM OF Al - Ga- Sn- Mg/KOH

The effect of inhibiting H_2-evolution for O-aminophenol on Al-alloy anode in 4 mol/L KOH was studied by galvanostatic gathering volumes of hydrogen evolution and stable state polarization curves and electrochemical impedance spectrum.The mechanism of inhibiting H_2-evolution for O-aminophenol was studied also in this paper.The results show that the self-dissolution of Al-anode is very heavy,and the H_2-evolution quantity manifested typical "positive difference effect".O-aminophenol including phenyl,amidocyanogen and hydroxyl absorbs easily on the surface of mental,which decreases the absorption quantity of OH~-on the surface of Al-anode and the volumes of hydrogen evolution.The performance of Al-Ga-Sn-Mg does not get poorer and the "positive difference effect" of Al-anode does not change,which manifest O-aminophenol to be an appropriate inhibitor in this system.