冷轧及固溶处理的FeMnNiCrAlSi高熵合金在不同酸性溶液中的腐蚀行为

Corrosion Behavior of Cold-Rolled and Solution-Treated FeMnNiCrAlSi HEA in Different Acidic Solutions.

作者信息

Mahmoud Essam R I, Mohamed Lamiaa Z, Gepreel Mohamed A, Ebied Saad, Abdelfatah Aliaa

机构信息

Department of Mechanical Engineering, Islamic University of Madinah, Madinah 4141, Saudi Arabia.

Mining, Petroleum and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt.

出版信息

Materials (Basel). 2022 Oct 19;15(20):7319. doi: 10.3390/ma15207319.

DOI:10.3390/ma15207319

PMID:36295384

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9609231/

Abstract

New high entropy alloys with good corrosion resistance in severe environment are receiving increasing attention. This work reports upon the microstructure and the corrosion resistance of the non-equiatomic FeMnNiCrAlSi alloy in different acidic solutions. This alloy was designed by thermodynamic calculations using CALPHAD SOFTWARE, fabricated through casting, subjected to cold-rolling and solution-treatment, and compared with SS304 stainless steel. The corrosion test was performed through electrochemical behavior in 0.6 M NaCl and 0.6 M NaCl with 0.5 M HSO and 0.6 M NaCl with 1 M HSO solutions. Experimental results indicate that the alloy is composed of FCC phase as the main constituent besides a small amount of other BCC/B2 phases and other intermetallics. The corrosion test measurements revealed that cold-rolled FeMnNiCrAlSi alloy is more resistant to corrosion in 0.6 M NaCl, while it is more susceptible to localized pits in HSO to 0.6 M NaCl. Experimental results indicate that the pits are preferentially occurred in the areas of BCC/B2 phase precipitates. The solution-treated FeMnNiCrAlSi HEA has the highest corrosion resistance compared to others with the addition of HSO to 0.6 M NaCl. Surface morphologies of the different conditions were studied, and relevant results were reported.

摘要

新型高熵合金在恶劣环境中具有良好的耐腐蚀性，正受到越来越多的关注。本文报道了非等原子FeMnNiCrAlSi合金在不同酸性溶液中的微观结构和耐腐蚀性。该合金通过使用CALPHAD软件进行热力学计算设计而成，通过铸造制备，经过冷轧和固溶处理，并与SS304不锈钢进行比较。腐蚀试验通过在0.6 M NaCl、0.6 M NaCl + 0.5 M H₂SO₄和0.6 M NaCl + 1 M H₂SO₄溶液中的电化学行为进行。实验结果表明，该合金除了少量其他体心立方（BCC）/B2相和其他金属间化合物外，主要由面心立方（FCC）相组成。腐蚀试验测量结果显示，冷轧的FeMnNiCrAlSi合金在0.6 M NaCl中更耐腐蚀，而在H₂SO₄存在的0.6 M NaCl中更容易出现局部点蚀。实验结果表明，点蚀优先发生在BCC/B2相析出区域。与其他样品相比，在0.6 M NaCl中添加H₂SO₄的情况下，经过固溶处理的FeMnNiCrAlSi高熵合金具有最高的耐腐蚀性。研究了不同条件下的表面形貌，并报告了相关结果。