过去,通常采用无机缓蚀剂对镁合金进行处理,关于镁的有机物缓蚀剂的报道较少.配制了鞣酸钠缓蚀剂,用极化曲线、交流阻抗技术研究了鞣酸钠对AZ61镁合金在0.5%NaCl中的缓蚀行为.通过扫描电子显微镜(SEM)对腐蚀形貌进行了观测.结果表明:鞣酸钠对AZ61镬合金在0.5%NaCl中有一定的缓蚀效果,其浓度为1.0×10-6mol/L时,缓蚀效果最好;鞣酸分子减弱了腐蚀性Cl-在金属/介质的吸附,其与镁合金表面的腐蚀产物Mg(OH)2构成了一层致密膜,从而较好地抑制了镁合金在介质中的腐蚀.
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