激光选区熔化Inconel 625合金在酸性环境中的腐蚀机理研究

doi:10.11896/cldb.24080164

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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.

Key words： selective laser melting Inconel 625 corrosion resistance roughness corrosion mechanism

Published: 25 May 2025 Online: 2025-05-13

CLC number:

TG174.3

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	Articles by authors
	HAN Ju
	WANG Bochao
	DONG Dongdong
	MA Rucheng
	LONG Haiyang
	LI Xiaoshuo
	WANG Tao
	YAN Xingchen

Cite this article:

HAN Ju,WANG Bochao,DONG Dongdong, et al. Investigation on the Corrosion Mechanism of Inconel 625 Alloy by Selective Laser Melting in Acidic Environment[J]. Materials Reports, 2025, 39(10): 24080164-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24080164 OR https://www.mater-rep.com/EN/Y2025/V39/I10/24080164

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