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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。
In this paper, pitting corrosion potential test, micro-potential scan, XPS, electron probe and SEM and other technologies. The corrosion inhibition effect of Na_2MoO_4, HEDP + ZnSO_4 and their composite inhibitors on the initiation and development of pitting corrosion of AISI 321 stainless steel in neutral NaCl solution was evaluated. The results show that Na_2MoO_4 has a good inhibitory effect on the initiation and development of pitting corrosion. HEDP + ZnSO_4 has obvious synergistic inhibition effect. It was found that the corrosion inhibition effect was related to the formation of MoCl_3 which was insoluble, and the content of Cl ~ - in the inner and outer membrane of the pore was significantly increased. It increases the instability of microetching induced potential E_z. The difference between E_b and E_z is increased, which reduces the potential peak of stable etch hole.