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首页> 外文期刊>International Journal of Electrochemical Science >On the Influence of Crystallographic Texture on Pitting Corrosion in Pipeline Steels
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On the Influence of Crystallographic Texture on Pitting Corrosion in Pipeline Steels

机译：晶体结构对管线钢点蚀的影响

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The influence of crystallographic texture on pitting corrosion is investigated in an API 5L X52 pipelinesteel through crystallographic texture and electrochemical studies. Test samples of the studied steelwere obtained with similar microstructure and different texture by means of differentthermomechanical processes. The texture was characterized by means of X-ray pole figuremeasurements. The texture-dependent resistance of each sample to pitting corrosion was predictedusing a function and an index which combine the susceptibility of crystallographic planes to anodicdissolution and their relative abundance at the material surface, this latter determined by the volumefraction of each texture fiber in the steel. The actual susceptibility of each sample to pitting corrosionwas determined by means of cyclic potentiodynamic polarization measurements in two solutionsemulating pipeline corrosion environments. The pitting susceptibility predicted from the texturemeasurements was in good agreement with the susceptibility determined from the cyclic polarizationtests. Although the anisotropic nature of anodic dissolution of iron has been known for decades, theuse of the crystallographic texture to predict the pitting resistance of pipeline steels conveys astatistical significance not reported until now.
机译：通过晶体结构和电化学研究，在API 5L X52管线钢中研究了晶体结构对点蚀的影响。通过不同的热机械过程获得了具有相似的组织和不同织构的被研究钢的试样。通过X射线极图测量来表征纹理。使用一个函数和一个指数来预测每个样品对点蚀的耐纹理性，该函数和一个指数结合了晶面对阳极溶解的敏感性及其在材料表面的相对丰度，后者由钢中每个纹理纤维的体积分数决定。每个样品对点蚀的实际敏感性是通过在模拟管道腐蚀环境的两种解决方案中通过循环恒电位极化测量确定的。根据织构测量结果预测的点蚀敏感性与通过循环极化试验确定的敏感性相吻合。尽管阳极溶解铁的各向异性性质已有数十年的历史，但利用晶体学结构预测管道钢的抗点蚀性却具有至今尚未报道的统计学意义。

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