Investigation on the Corrosion Mechanism of Inconel 625 Alloy by Selective Laser Melting in Acidic Environment
HAN Ju1,†, WANG Bochao1,2,†, DONG Dongdong2, MA Rucheng2, LONG Haiyang1, LI Xiaoshuo1, WANG Tao1, YAN Xingchen2,*
1 College of Mechanical Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China 2 Guangdong-Hong Kong Joint Laboratory of Modern Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China
Abstract: Corrosion mechanism of Inconel 625 alloy fabricated by selective laser melting was investigated in a mixed acid (a mixed solution of sulfuric acid and nitric acid). Meanwhile, for Inconel 625 alloy, the effect of roughness on corrosion rate was investigated. The original and polished samples of Inconel 625 fabricated by selective laser melting (SLM) were immersed in a mixed acid at 50 ℃ for 120 h, 240 h, 480 h, 840 h and 1 080 h, respectively. The results show that the corrosion type of the alloy is pitting corrosion, which is first generated between the alloy grains, and the pitting density at the edge of the alloy molten pool was higher. With the increase of corrosion time, the entire grain boundary was gradually corroded, and pitting corrosion occurs inside the grain. The overall average corrosion rate of the polished sample was 2.80×10-3 mm/a, and the original sample was 12.70×10-3 mm/a, which was nearly 5 times that of the polished sample. It showed that roughness has a great influence on the corrosion rate, and the higher the roughness of the sample, the larger the contact area with the mixed acid, and the faster the corrosion rate.
韩炬, 王博超, 董东东, 马汝成, 龙海洋, 李晓硕, 王涛, 闫星辰. 激光选区熔化Inconel 625合金在酸性环境中的腐蚀机理研究[J]. 材料导报, 2025, 39(10): 24080164-6.
HAN Ju, WANG Bochao, DONG Dongdong, MA Rucheng, LONG Haiyang, LI Xiaoshuo, WANG Tao, YAN Xingchen. Investigation on the Corrosion Mechanism of Inconel 625 Alloy by Selective Laser Melting in Acidic Environment. Materials Reports, 2025, 39(10): 24080164-6.
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2025, Vol. 39 
