材料科学
点蚀
X射线光电子能谱
腐蚀
氮气
合金
冶金
高熵合金
核化学
化学工程
化学
工程类
有机化学
作者
Changzhu Yang,Hao Feng,Xiaobo Chen,Yu Han,Huabing Li,Dake Xu,Fuhui Wang
标识
DOI:10.1016/j.jmst.2022.08.021
摘要
Corrosion-resistant high nitrogen high entropy alloys (HEAs) were manufactured by pressurized metallurgy. This work revealed the inhibitory effect of nitrogen on pitting corrosion of HEAs caused by sulfate reducing bacterium Desulfovibrio vulgaris. Results indicated that HEA-0 N was susceptible to pitting corrosion and sulfidation under attack of D. vulgaris, whereas the addition of nitrogen significantly decreased the pitting sensitivity. Pitting potentials of HEA-0.52 N and HEA-1.23 N increased by 133% and 171%, respectively compared to HEA-0 N in the presence of SRB. X-ray photoelectron spectroscopy results unveiled that nitrogen enriched in passive film and strengthened it by increasing fraction of Cr2O3 and Fe3+ox. Surface of the nitrogen-alloyed HEAs exhibited less defective passive films as revealed by Mott-Schottky results. Nitrogen doping provides a novel insight into the design of microbial corrosion resistant HEA.
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