根据实验结果,作者认为钼酸钠抑制GCr15钢在中性介质中点腐蚀不是由于钼酸钠的去极化作用,而可能是由于MoO_4~(2-)与Cl~-竞争吸附,使Mo在点蚀活性点上富集,从而减弱了Cl~-的侵蚀活性,并且生成含有Fe~(3+)和Mo~(6+)的比较复杂的钝化膜。 根据MoO_4~(2-)和Cl~-竞争吸附模型,导出了MoO_4~(2-)和Cl-临界浓度之间的对数关系logC_(Mo)O_4~(2-)=AlogCc-+B,这与实验得到的结果完全一致.
The authors have proved in this paper that the inhiditon of pitting corrosion of GCrl5 steel by sodium molybdate in near-neutral solution is not due to depolarization of Na_2MoO_4 but to competitive adsorption of M0O_4~(2-) with Cl~-. Thus, Mo accumulates at active sites on the metal surface and the corrosive activity of Cl~- decreases. A complex passive film containing Fe~(3+) and Mo~(6+) has also been formed on the metal surface. According to the model of competitve adsorption of MoO_4~(2-) with Cl~-, a linear relationship detween the logarithm of the critical concentration of MoO_4~(2-) and the logarithm of the concentration of Cl~- can be derived as logCMoO_4~(2-)= A logC_(Cl)~-+B vnd the experimental critical values of CmoO_4~(2-) are in good agreement with Values predicated dy the above equation.
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