本文采用孔蚀特征电位测试、微区电位扫描、XPS、电子探针与SEM等技术。评价了Na_2MoO_4、HEDP+ZnSO_4及其复合缓蚀剂,在中性NaCl溶液中对AISI 321不锈钢孔蚀的引发与发展过程的缓蚀作用。结果表明,Na_2MoO_4对孔蚀的引发与发展的两个阶段都有良好的抑制作用。与HEDP+ZnSO_4有明显的协同缓蚀效应。发现它的缓蚀作用与难溶的MoCl_3的生成有关,并使孔内外膜中的Cl~-含量显著增大。它提高了不稳定微蚀孔引发电位E_z。加大了孔蚀电位E_b与E_z的差值,减小了稳定蚀孔的电位峰值。
The charcteristie pitting potential measurements, scanning micro-reference electrode technique, XPS, electron probe, SEM were used to evaluate the suppression of the initiation and propagation of pitting corrosion of AISI 321 stainless steel in neutral NaCl aqueous solution by addition of Na_2MoO_4, HEDP+ZnSO_4 and their mixture. The results showed that Na_2MoO_4 is an efficient inhibitor for both the initiation and the propagation of pitting corrosion and has marked synergic inhibition with HEDP+ZnSO_4. The inhibition of the mixture inhibitor is related to the formation of insoluble MoCl_3. It is found that Cl~- content markedly increase inside and outside pits of the film and that the initiation potential E_z of instable micro pits raises, the difference between breakthrough potential E_b and E_z increases.
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