晶粒尺寸梯度分布对316L不锈钢耐腐蚀性能的影响

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Abstract A gradient nanostructure with grain size varied from nanocrystals to coarse grains was prepared on the surface of 316L stainless steel by surface mechanical grinding treatment (SMGT). The corrosion resistance of the gradient sample was measured by chemical immersion experiment and electrochemical corrosion test, and the effect of gradient grain size distribution on corrosion resistance of 316L stainless steel was analyzed. The results show that stable corrosion pits appeared in the nanocrystalline and coarse-grained samples after 20 h immersion, while the surface of the gradient samples remained intact after 50 h immersion. Electrochemical tests show that the corrosion potential of the gradient sample was enhanced from -230 mV (nanocrystalline sample) to -4 mV. Meanwhile, the corrosion current density decreased from 0.137 A/cm² to 0.036 A/cm². The grain size gradient distribution does not change the kinetics of passivation film formation. The excellent corrosion resistance of the gradient sample originates from the higher thickness and integrity, lower residual stress of the passivation film.

Key words： grain size distribution corrosion nanocrystalline surface mechanical grinding treatment 316L stainless steel

Received: 29 January 2021 Published: 21 July 2021

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TG172.5

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	CAI Feng
	FANG Tiehui

Cite this article:

CAI Feng,FANG Tiehui. Effect of gradient distribution of grain size on corrosion resistance of 316L stainless steel[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(3): 227-234.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I3/227

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