Effect of Surface Scratches on Corrosion Behavior of 304 Stainless Steel Beneath Droplets of Solution (0.5 mol/L NaCl+0.25 mol/L MgCl2)

doi:10.11902/1005.4537.2020.281

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 99-105 DOI: 10.11902/1005.4537.2020.281

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Effect of Surface Scratches on Corrosion Behavior of 304 Stainless Steel Beneath Droplets of Solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂)

CHENG Qidong, WANG Yanhua(

)

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

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Abstract

The effect of surface roughness and scratch depth on corrosion behavior of 304 stainless steel beneath droplets of solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂) were studied by means of electrochemical method and the surface analysis techniques. It was found that the increase of roughness and scratch depth can significantly enhance the probability and shorten the induction time of pitting corrosion. The corrosion pits are shallow disk-shaped and the size of pits increases with the roughness and scratch depth. According to the distribution checking, the corrosion pits tend to distribute randomly on the surface of low roughness or no scratches, while they tend to appear at the scratches near the edge of the droplet on the surface of high roughness with deep scratches. According to the element distribution in the pitting region, it was found that the pitting corrosion was related to the evaporation of liquid droplets and the increase of Cl^- concentration, which led to the destruction of important components of the passivation film such as oxides of Fe and Ni.

Key words: stainless steel pitting corrosion droplet roughness scratch

Received: 30 December 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51131005)

Corresponding Authors: WANG Yanhua E-mail: wyhazz@163.com

About author: WANG Yanhua, E-mail: wyhazz@163.com

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Cite this article:

CHENG Qidong, WANG Yanhua. Effect of Surface Scratches on Corrosion Behavior of 304 Stainless Steel Beneath Droplets of Solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂). Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 99-105.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.281 OR https://www.jcscp.org/EN/Y2022/V42/I1/99

Fig.1 Pitting probability of stainless steel surface with different roughness (a), contact angle and average coverage area corresponding to stainless steel surface with different roughness (b) and pitting probability of stainless steel surface with scratches of different depth (c)

Fig.2 Open circuit potential of 304 stainless steel with roughness R_a=3.356 μm (a), pitting induction time of stainless steel with different roughness (b) and with scratches of different depth (c)

Fig.3 Mott-Schottky curves of 304 stainless steel with different roughness

Table 1 Maximum depth and the equivalent diameter of corrosion pits on stainless steel surface with different roughness

Table 2 Maximum depth and the equivalent diameter of corrosion pits on stainless steel surface with scratches of different depth

Table 3 Distribution of corrosion pits on the surface of 304 stainless steel with different roughness

Table 4 Distribution of corrosion pits on the surface of 304 stainless steel with scratches of different depth

Fig.4 Z values obtained from binomial distribution test of pitting position on stainless steel surface with different roughness (a) and from binomial distribution test of pitting position on stainless steel surface with scratches of different depths (b)

Fig.5 SEM image of pitting region (a) and EDS test results of pitting region (b)

Fig.6 Mechanism of pitting initiation process of 304 stainless steel with different scratch depths: (a) low roughness without scratches, (b) high roughness with deep scratches

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