铬和钼对钢的局部腐蚀发展过程的影响

中国腐蚀与防护学报

1983, Vol. 3

Issue (1): 22-34

研究报告

本期目录 | 过刊浏览

铬和钼对钢的局部腐蚀发展过程的影响

杨武;A.Pourbaix

上海材料研究所;比利时腐蚀研究中心

EFFECT OF CHROMIUM AND MOLYBDENUM ON THE PROPAGATION OF LOCALIZED CORROSION OF STEELS

Yang Wu(W. Yang)(Shanghai Research Institute of Materials)A. Pour baix(CEBELCOR)

全文: PDF(1114 KB)

摘要: 为阐明铬和钼对钢的局部腐蚀发展过程的影响,在类似于钢的闭塞腐蚀电池(OCC)内部溶液的条件下,研究了纯铬、纯铝和某些不锈钢的电化学行为。实验所用的溶液为无氧FeCl_2和/或CrCl_3。当pH高于约1.8时,Cr是钝化的,因此,在局部腐蚀发展的早期阶段,铬可起阻滞作用,但是,Cr~(3+)的水解可使pH降至更低值,在这种低pH和高Cl~-浓度条件下,在与钢的局部腐蚀对应的电位区,Cr是活化的。而在同样条件下,Mo是钝化的,而且在此电位区Mo的钝性归因于MoO_2膜的生成,这种氧化膜非常稳定,且保护性很好,因此,在局部腐蚀的深入发展阶段,Mo可有效地抑制腐蚀的发展。

Abstract：In order to clarify the effect of Cr and Mo on the propagation of localized corrosion of steels, the electrochemical behavior of pure Cr and Mo and of some stainless steels was studied under conditions similar to those existing inside occluded corrosion cells (OCC) of steels.Oxygen-free FeCl_2 and/or CrCl_3 solutions were used for experiments.Cr is passive if pH is higher than ca.1.8.Therefore Cr may retard the propagation of localized corrosion of steels in its early stage.But the hydrolysis of Cr~(3+) may change the pH to even lower values.At such low pH and high Cl~- co centration, Cr is active in the potential range of interest for localized corrosion of steels.Mo is passive in these more acidic conditions and the passivity of Mo in this potential range is attributed to the formation of a film of MoO_2, which is very stable and protective.Mo is thus effective to retard the propagation of localized corrosion of steels in its more advanced stage.

收稿日期: 1983-02-25

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引用本文:

杨武;A.Pourbaix. 铬和钼对钢的局部腐蚀发展过程的影响[J]. 中国腐蚀与防护学报, 1983, 3(1): 22-34.
. EFFECT OF CHROMIUM AND MOLYBDENUM ON THE PROPAGATION OF LOCALIZED CORROSION OF STEELS. J Chin Soc Corr Pro, 1983, 3(1): 22-34.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1983/V3/I1/22

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