Surface Modification of Corrosion-resistant Cast Iron Based on Functional Requirements of Grounding Materials

doi:10.11902/1005.4537.2024.039

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1443-1453 DOI: 10.11902/1005.4537.2024.039

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Surface Modification of Corrosion-resistant Cast Iron Based on Functional Requirements of Grounding Materials

LU Tianai, JIANG Wenhao, WU Wei, ZHANG Junxi(

)

Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China

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LU Tianai, JIANG Wenhao, WU Wei, ZHANG Junxi. Surface Modification of Corrosion-resistant Cast Iron Based on Functional Requirements of Grounding Materials. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1443-1453.

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Abstract

The requirements of power system for the corrosion resistance, conductivity and cost of grounding materials are increasing, so it is crucial to develop a new type of grounding materials. Herein, the cast iron was surface modified by carburization with epoxy resin as the carbon source, while controlling heating rate, holding temperature and time. The effect of heat treatment parameters on the microstructure, composition and corrosion resistance of the cast iron before and after carburization were comparatively charachterized by means of XRD, SEM, metallography, Raman spestroscopy, and electrochemical corrosion test. The results showed that there was an obvious carburization coating formed on the cast iron surface, which was mainly Fe₃C, thereby the corrosion resistance of the carbuurized cast iron was significantly improved. The best carburizing parameter is to heat up from room temperature to 750^oC at a rate of 5^oC/min, followed by furnace cooling. The carburization treatment to certain extent process can significantly enhance the corrosion resistance and conductivity of the cast iron, which met the functional requirements of grounding materials.

Key words: grounding net cast iron carburizing corrosion resistance electrochemical measurement

Received: 26 January 2024 32134.14.1005.4537.2024.039

ZTFLH:

TG172

Corresponding Authors: ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn

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	JIANG Wenhao
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https://www.jcscp.org/EN/10.11902/1005.4537.2024.039 OR https://www.jcscp.org/EN/Y2024/V44/I6/1443

Fig.1 Surface and cross-sectional micro-morphologies of the cast iron carburized at 750^oC (a-c), 800^oC (d-f) and 900^oC (g-i) for 0 h (a, d, g), 0.5 h (b, e, h) and 1 h (c, f, i)

Fig.2 XRD patterns (a) and Raman spectroscopies (b) of carburized layers formed on the cast iron under different carburizing conditions

Fig.3 Microstructures of graphite (a) and cementite (b) of original cast iron

Fig.4 Morphologies of graphite in cast iron substrate carburized at 750^oC (a-c), 800^oC (d-f) and 900^oC (g-i) for 0 h (a, d, g), 0.5 h (b, e, h) and 1 h (c, f, i)

Fig.5 Morphologies of cementite in cast iron substrate carburized at 750℃ (a-c), 800^oC (d-f) and 900^oC (g-i) for 0 h (a, d, g), 0.5 h (b, e, h) and 1 h (c, f, i)

Fig.6 Schematic diagrams of carburizing process via heating epoxy resin

Fig.7 Polarization curves (a) and fitting corrosion rates (b) of cast iron samples untreated and carburized under different conditions in NS4 simulated soil solution

Fig.8 Electrochemical polarization curves (a) and fitting corrosion rates (b) of cast iron samples untreated and carburized at 750^oC for 0h after immersion in NS4 simulated soil solution for different time

Fig.9 EIS curves of cast iron samples untreated (a-c) and carburized (d-f) at 750^oC for 0 h after immersion in NS4 simulated soil solution for different time

Table 1 Fitting electrochemical parameters of EIS curves shown in Fig.9

Fig.10 Cross-sectional morphologies of cast iron samples untreated (a) and carburized (b) at 750^oC for 0 h after immersion in NS4 simulated soil solution for 35 d

Fig.11 Polarization curves (a) and corresponding corrosion rates (b) of untreated and 750^oC/0 h carburized cast iron and galvanized steel in NS4 soil simulated solution at different AC current intensities

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