Effect of Heat Treatments on Corrosion Behavior of 3Cr Low Carbon Steel

doi:10.11902/1005.4537.2022.195

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 656-662 DOI: 10.11902/1005.4537.2022.195

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Effect of Heat Treatments on Corrosion Behavior of 3Cr Low Carbon Steel

XIA Xiaojian¹, WAN Xinyuan¹, CHEN Yunxiang¹, HAN Jiceng¹, CHEN Yiyang¹, YAN Kanghua¹, LIN Deyuan¹, CHEN Tianpeng², ZUO Xiaomei³, SUN Baozhuang³, CHENG Xuequn³(

)

^1.State Grid Fujian Electric Power Research Institute, Fuzhou 350003, China
^2.State Grid Putian Electric Power Supply Company, Putian 351100, China
^3.Corrosion Protection Center, University of Sciences and Technology Beijing, Beijing 100083, China

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Abstract

The effect of heat treatments on the corrosion behavior of low carbon steels with 3%Cr (mass fraction) in Cl^- containing environment was assessed by means of immersion test, electrochemical measurements, scanning Kelvin probe (SKP), and atomic force microscope (AFM). Results show that annealing leads to single ferrite microstructure, and normalizing causes duplex microstructure consisting of ferrite and bainite. The microstructure difference is the intrinsic reason for the corrosion morphology difference in the initial corrosion stage. In the contrast to the microstructure of annealed steel, the existence of two phases in the normalized microstructure causes galvanic effect, which then resulted in lower corrosion resistance of the steel.

Key words: low carbon steel heat treatment microstructure micro-electrochemistry

Received: 14 June 2022 32134.14.1005.4537.2022.195

ZTFLH:

TG172.3

Fund: Science and Technology Project of State Grid Fujian Electric Company(52130421N003)

Corresponding Authors: CHENG Xuequn, E-mail: chengxuequn@ustb.edu.cn

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	Articles by authors
	XIA Xiaojian
	WAN Xinyuan
	CHEN Yunxiang
	HAN Jiceng
	CHEN Yiyang
	YAN Kanghua
	LIN Deyuan
	CHEN Tianpeng
	ZUO Xiaomei
	SUN Baozhuang
	CHENG Xuequn

Cite this article:

XIA Xiaojian, WAN Xinyuan, CHEN Yunxiang, HAN Jiceng, CHEN Yiyang, YAN Kanghua, LIN Deyuan, CHEN Tianpeng, ZUO Xiaomei, SUN Baozhuang, CHENG Xuequn. Effect of Heat Treatments on Corrosion Behavior of 3Cr Low Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 656-662.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.195 OR https://www.jcscp.org/EN/Y2023/V43/I3/656

Fig.1 Schematic diagram of the heat treatment process of the test steel

Fig.2 Schematic diagram of SKP scanning area

Fig.3 Metallographic structures of 3Cr steel under different heat treatment conditions: (a) annealed sample, (b) normalized sample

Fig.4 EBSD characterization of 3Cr steel under different heat treatment conditions: (a) annealed microstructure, (b) normalized microstructure, (c) annealed misorientation angle analysis, (d) normalized misorientation angle analysis

Fig.5 Surface corrosion micro-morphologies of 3Cr steel samples after immersion for 2 d (a, c) and 20 d (b, d) under annealed (a, b) and normalized (c, d) conditions

Fig.6 Microstructures (a, c) and 3D profile (b, d) of corrosion products removed from 3Cr steel after immersion for 20 d under annealed (a, b) and normalized (c, d) conditions

Fig.7 Nyquist (a, d), impedance module (b, e) and phase angle (c, f) plots of annealed (a-c) and normalized (d-f) samples after soaking in 0.5%NaCl (pH 3) solution for different time

Fig.8 Equivalent circuit diagram of EIS

Fig.9 R_ct change curves of two heat-treated samples after immersion for different time

Fig.10 SKP potential distribution of the normalized/annealed coupled sample before (a) and after (b) immersion for 30 min

Fig.11 Morphologies (a1, b1), potentials (a2, b2) and the potential change dagrams of the contour line position (a3, b3) of 3Cr steel samples under annealed (a1-a3) and normalized (b1-b3) conditions

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