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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Cr Content on the Electrochemical Behavior of Low- chromium X65 Steel in CO2 Environment
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Effect of Cr Content on the Electrochemical Behavior of Low- chromium X65 Steel in CO2 Environment

机译：Cr含量对CO 2 环境下低铬X65钢电化学行为的影响

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摘要

The electrochemical behavior of 1Cr, 3Cr and 5Cr steel in CO2 environment was investigated in situby means of electrochemical measurements. The characteristics of corrosion scale were characterizedby surface analysis techniques. The results showed that 3Cr steel could reduce the corrosion rate by51% compared with 1Cr steel, and the reduction in the corrosion rate slowed when the Cr content inX65 steel was higher than 3%. The Cr-rich corrosion scale on 1Cr, 3Cr and 5Cr steels possessed aprepassivation characteristic. When the Cr content was 3% or higher, an adequate amount of Crcompounds could form in the prepassivation film, which effectively inhibited the localized corrosion,while the pitting sources on 1Cr steel were developed to form the corrosion pits. The increase ofCr(OH)3 content in the prepassivation film was conducive to improve the stability and compactness ofthe corrosion scale, and thus providing a favorable protection for the substrate, which was the reasonwhy the CO2 corrosion resistance of low Cr steel improved with the increase of Cr content.
机译：通过电化学测量，对1Cr，3Cr和5Cr钢在CO2环境中的电化学行为进行了现场研究。用表面分析技术表征了腐蚀垢的特征。结果表明：3Cr钢与1Cr钢相比，腐蚀速率降低了51％;当X65钢中Cr含量高于3％时，腐蚀速率的降低速度减慢。 1Cr，3Cr和5Cr钢上的富铬腐蚀垢具有预钝化特性。当Cr含量为3％或更高时，预钝化膜中会形成足够数量的Cr化合物，从而有效地抑制了局部腐蚀，同时开发了1Cr钢上的点蚀源以形成腐蚀点。预钝化膜中Cr（OH）3含量的增加有利于提高腐蚀垢的稳定性和致密性，从而为基底提供良好的保护，这就是为什么低铬钢的CO2耐蚀性随着增加而提高的原因。铬含量。

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