利用电化学和显色检测法分级评估316L不锈钢钝化膜完整性

doi:10.11896/cldb.22050337

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Abstract The quality inspection and evaluation of passivation and damage of stainless steel equipment in nuclear power and aerospace engineering in the high temperature and high salt marine environment and a method of grading the integrity of passive film based on chromaticity image analysis were proposed. Taking 316L stainless steel with different passivation and its damage state as the research object, through the analysis of red chromaticity image and electrochemical corrosion behavior detection, the relationship between chromaticity and corrosion resistance was established, and the grade range was obtained. The results show that the chromaticity increased with the increase of passive film damage and decreased with the increase of self-passivation time. There were two peaks in the histogram of secondary local damage. The chromaticity percen-tage and area percentage showed the characteristics of double logarithm linear two-stage. Potentiodynamic polarization and impedance showed that the pitting potential and interface reaction impedance decreased with the increase of damage degree. The corrosion resistance decreased with the increase of chromogenic chromaticity, and finally three chromaticity grades of 316L stainless steel passivation film integrity was obtained. This can provide a theoretical basis for the quality inspection and grading evaluation of stainless steel passivation films.

Key words： stainless steel passive film damage chemical passivation color detection

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TG457.11

Fund:National Natural Science Foundation of China (51571051).

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	Articles by authors
	ZHAO Xiaoyan
	WANG Dongying
	CHENG Congqian
	CAO Tieshan
	LIU Baojun
	YAO Jingwen
	ZHAO Jie

Cite this article:

ZHAO Xiaoyan,WANG Dongying,CHENG Congqian, et al. Grading Assessment of the Integrity of Passivated Films in 316L Stainless Steel Using Electrochemical and Color Detection[J]. Materials Reports, 2024, 38(3): 22050337-5.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22050337 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22050337

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