钼酸钠抑制GCr15钢点腐蚀机理的研究

中国腐蚀与防护学报

1986, Vol. 6

Issue (1): 15-21

研究报告

本期目录 | 过刊浏览

钼酸钠抑制GCr15钢点腐蚀机理的研究

利建强;周德瑞;徐海涛

哈尔滨工业大学;哈尔滨工业大学;哈尔滨工业大学

A STUDY OF THE MECHANISM FOR INHIBITING PITTING OF GCr15 STEEL BY SODIUM MOLYBDATE

Li Jianqiang Zhou Derui and Xu Haitao (Harbin Institute of Technology)

全文: PDF(940 KB)

摘要: 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.

Abstract：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.

收稿日期: 1986-02-25

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引用本文:

利建强;周德瑞;徐海涛. 钼酸钠抑制GCr15钢点腐蚀机理的研究[J]. 中国腐蚀与防护学报, 1986, 6(1): 15-21.
. A STUDY OF THE MECHANISM FOR INHIBITING PITTING OF GCr15 STEEL BY SODIUM MOLYBDATE. J Chin Soc Corr Pro, 1986, 6(1): 15-21.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1986/V6/I1/15

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