采用电化学测试技术、化学浸泡方法和现代物理测试技术,探讨了高温高浓度溴化锂溶液中碳钢钝化膜的结构及形成机理.结果表明,在55%LiBr+0.07 mol/LiOH溶液中(145℃),随Na2MoO4浓度增加碳钢极化阻抗升高,析氢量减少,当其浓度达到150 mg/L以上时对碳钢具有良好的缓蚀效果;MoO42-在金属表面还原而参与钝化膜生成,在膜的生长过程中吸附于膜的薄弱点形成MoO3,膜中Mo的不同价态形成的电场抑制了碳钢的活性溶解;MoO42-还原反应遵循下列反应方程:MoO42-+2H2O+2e MoO2+4OH-.
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