Effect of Synergistic Action of Cu/Ni on Corrosion Resistance of Low Alloy Steel in a Simulated Tropical Marine Atmosphere

doi:10.11902/1005.4537.2018.165

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 511-518 DOI: 10.11902/1005.4537.2018.165

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Effect of Synergistic Action of Cu/Ni on Corrosion Resistance of Low Alloy Steel in a Simulated Tropical Marine Atmosphere

ZHANG Tianyi¹,LIU Wei¹(

),FAN Yueming¹,LI Shimin¹,DONG Baojun¹,BANTHUKUL Wongpat¹,CHOWWANONTHAPUNYA Thee²

1. Corrosion and Protection Center, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2. Faculty of International Maritime Studies, Kasetsart University, Sriracha, Chonburi 20230, Thailand

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Abstract

The effect of synergistic action of Cu and Ni on corrosion rate, morphology and composition of the rust formed on three low alloy steels with different contents of Cu and Ni was studied via indoor spray acceleration tests, aiming to simulate the harsh tropical marine atmosphere. Meanwhile, electrochemical impedance spectroscopy (EIS) and linear polarization tests for the three steels were also carried out in 0.5% (mass fraction) NaCl solution. The results show that with the increase of Cu- and Ni-content, the rust layer formed on the steels subjected to spraying test becomes gradually thinner and denser, and the enrichment of Cu in the rust layer mitigates the invasion of Cl^-. The charge transfers resistance (R_t) and polarization resistance of the metal dissolution reaction were increased to some extent by the synergistic effect of two elements of Cu and Ni, which accelerated the formation and enhanced the protectiveness of the rust layer through inhibiting the anodic electrochemical reaction.

Key words: corrosion resistant steel tropical marine atmospheric environment corrosion synergistic action polarization resistance

Received: 09 November 2018

ZTFLH:

TG172

Fund: Supported by National Key R&D Program of China(2016YFE0203600);National Natural Science Foundation of China(51571027)

Corresponding Authors: Wei LIU E-mail: weiliu@ustb.edu.cn

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	Tianyi ZHANG
	Wei LIU
	Yueming FAN
	Shimin LI
	Baojun DONG
	Wongpat BANTHUKUL
	Thee CHOWWANONTHAPUNYA

Cite this article:

ZHANG Tianyi,LIU Wei,FAN Yueming,LI Shimin,DONG Baojun,BANTHUKUL Wongpat,CHOWWANONTHAPUNYA Thee. Effect of Synergistic Action of Cu/Ni on Corrosion Resistance of Low Alloy Steel in a Simulated Tropical Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 511-518.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.165 OR https://www.jcscp.org/EN/Y2019/V39/I6/511

Table 1 Chemical compositions of three tested steels (mass fraction / %)

Fig.1 Metallographic microstructures of 0.7Cu-0.7Ni (a), 0.4Cu-0.4Ni (b) and 0.3Cu-0.3Ni (c) steels

Fig.2 Corrosion rates of three tested steels during indoor spray test

Fig.3 Macroscopic morphologies of 0.7Cu-0.7Ni (a, d), 0.4Cu-0.4Ni (b, e) and 0.3Cu-0.3Ni (c, f) steels with (a~c) and without (d~f) rust layers after 240 h spraying test

Fig.4 SEM images of the rust layers formed on 0.7Cu-0.7Ni (a), 0.4Cu-0.4N (b) and 0.3Cu-0.3Ni (c) steels after 240 h spraying test

Fig.5 Cross-sectional morphologies of 0.7Cu-0.7Ni (a), 0.4Cu-0.4N (b) and 0.3Cu-0.3Ni (c) steels after 240 h spraying test, and EDS analysis results of Cl, Cr and Cu at the marked points in Fig.5a~c (d)

Fig.6 Nyquist diagram of EIS of three bare steels and corresponding equivalent circuit

Table 2 Electrochemical parameters obtained by fitting EIS of three bare steels

Fig.7 Nyquist plots of EIS of three steel samples after 240 h spraying test and corresponding equivalent circuit model

Table 3 Fitting values of various electrochemical parameters based on EIS of three steel samples after spray test for 240 h

Fig.8 Linear polarization curves of three steels after spraying test for 0 h (a) and 240 h (b)

Table 4 Fitting parameters of the linear polarization curves in Fig.8

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