In Situ SECM Observation of Corrosion Behavior of Carbon Steel at Defects of Epoxy Coating under AC Current Conditions

doi:10.11901/1005.3093.2019.571

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 545-553 DOI: 10.11901/1005.3093.2019.571

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In Situ SECM Observation of Corrosion Behavior of Carbon Steel at Defects of Epoxy Coating under AC Current Conditions

GONG Weiwei¹, YANG Bingkun²(

), CHEN Yun², HAO Wenkui², WANG Xiaofang², CHEN Hao¹

1.Inner Mongolia Power Research Institute, Hohhot 010020, China
2.State Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102211, China

Cite this article:

GONG Weiwei, YANG Bingkun, CHEN Yun, HAO Wenkui, WANG Xiaofang, CHEN Hao. In Situ SECM Observation of Corrosion Behavior of Carbon Steel at Defects of Epoxy Coating under AC Current Conditions. Chinese Journal of Materials Research, 2020, 34(7): 545-553.

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Abstract

The carbon steel corrosion behavior at defects of epoxy coating in the effect of different AC current densities was investigated by means of in situ micro-area electrochemistry and traditional macro-electrochemical techniques, namely electrochemical scanning microscopy (SECM) and electrochemical impedance spectroscopy techniques. SECM observation can directly reveal the change of electrochemical active points during the local corrosion process of carbon steel at coating defects. The results show that when AC current is present, the number of corrosion active points at the coating defects is significantly more than that in the absence of AC current, correspondingly, the inhibitory effect of the corrosion products is significantly weaker than that in the case without AC current. The corrosion at the coating defect at the initial stage of immersion is an electron transfer control process, and it is converted to a diffusion control process after soaking for 10 hours. With the increase of AC current intensity and immersion time the degree of coating peeling increases, and the depth and width of the pits increase.

Key words: materials failure and protection in situ carbon steel corrosion AC current

Received: 05 December 2019

ZTFLH:

TG174.4

Fund: Science and Technology Project of Inner Mongolia Power Company(2019-102)

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	Weiwei GONG
	Bingkun YANG
	Yun CHEN
	Wenkui HAO
	Xiaofang WANG
	Hao CHEN

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2019.571 OR https://www.cjmr.org/EN/Y2020/V34/I7/545

Fig.1 Schematic diagram of SECM scanning device

Fig.2 SECM image of samples soaked for different time without AC current (a) 0 h; (b) 5 h; (c) 10 h; (d) 24 h

Fig.3 SECM images of samples soaked for different time at current density of 50 A/m²(a) 0 h; (b) 5 h; (c) 10 h; (d) 24 h

Fig.4 SECM images of samples soaked for different time at current density of 100 A/m² (a) 0 h; (b) 5 h; (c) 10 h; (d) 24 h

Fig.5 SECM images of samples soaked for different time at current density of 300 A/m²(a) 0 h; (b) 5 h; (c) 10 h; (d) 24 h

Table 1 Maximum anode current peak for samples soaked for different time at different AC current densities

Fig.6 Probe scanning current for samples soaked for different time at different AC current densities (a) 50 A/m²; (b) 100 A/m²; (c) 300 A/m²

Fig.7 Nyquist plots and corresponding Bode plots for samples soaked for deferent time at different AC current densities (a, b) 50 A/m²; (c, d) 100 A/m²; (e, f) 300 A/m²

Fig.8 Equivalent circuit for the sample defect

Table 2 Fitted values of the elements of the equivalent circuit

Fig.9 Change of R_p for samples soaked for deferent time at different AC current densities

Table 3 Corrosion pit depth for samples soaked for different time at different AC current densities (μm)

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