Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel

IF 2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2025-02-02 DOI:10.1002/maco.202414782

Alireza Kalhor, Mohammad Javad Sohrabi, Mohammad Mobasheri, Kinga Rodak, Changiz Dehghanian, Hamed Mirzadeh

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Abstract

The effects of the centerline average (R_a), kurtosis (Rku), and Cr concentration at the surface on the pitting corrosion resistance of AISI 304L stainless steel were studied based on the modification of the corroding surface by mechanical polishing and electropolishing routes. The values of E_P − E_corr, E_P − E_rp, and i_P were devised as the quantitative measures of pitting resistance, where E_P is the pitting potential, E_rp is the repassivation potential, E_corr is the corrosion potential, and i_P is the passive current density. Preliminary, the improved resistance against pitting corrosion was associated with the reduced R_a and the elevated Cr concentration on the surface. However, more intense analysis revealed that the samples with Rku < ~3 (platykurtic distribution) exhibited a good resistance to pitting attack, irrespective of the values of R_a and Cr content. Accordingly, the importance of the Rku as a decisive topographic parameter for pitting attack was established.

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峰度是影响AISI 304L不锈钢点蚀的决定性形貌参数

通过对腐蚀表面进行机械抛光和电抛光处理，研究了腐蚀表面中心线平均值（Ra）、峰度（Rku）和Cr浓度对AISI 304L不锈钢耐点蚀性能的影响。其中EP为点蚀电位，Erp为再钝化电位，Ecorr为腐蚀电位，iP为无源电流密度，EP−Ecorr、EP−Erp和iP作为点蚀电阻的定量指标。初步认为，抗点蚀性能的提高与表面Ra浓度的降低和Cr浓度的升高有关。然而，更深入的分析表明，无论Ra和Cr含量如何，具有Rku <； ~3 （platykurtic distribution）分布的样品都具有良好的抗点蚀性。因此，确定了Rku作为蚀点攻击的决定性地形参数的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学：综合

CiteScore

3.70

自引率

11.10%

发文量

199

审稿时长

1.4 months

期刊介绍： Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.