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| 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) |
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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.
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Received: 25 February 1986
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[8] Kodana, T., Amevose, J. R, Corrosion, 33, 155(1977) |
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