Galvanic Corrosion Behavior of 5083 Al-alloy and 30CrMnSiA Steel in NaCl solutions

doi:10.11902/1005.4537.2020.184

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 883-891 DOI: 10.11902/1005.4537.2020.184

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Galvanic Corrosion Behavior of 5083 Al-alloy and 30CrMnSiA Steel in NaCl solutions

LIU Quanbing, LIU Zongde(

), GUO Shengyang, XIAO Yi

Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

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Abstract

The galvanic corrosion behavior of the couple of 5083Al-alloy and 30CrMnSiA steel in 0.05, 0.1, 0.6 and 0.85 mol/L NaCl solutions was studied by means of immersion test, corrosion morphology observation, corrosion products analysis and electrochemical measurements, while the corrosion mechanism of the galvanic couple in 0.6 mol/L NaCl solution was specially examined. The results showed that the galvanic current density of the galvanic couple in 0.1 mol/L NaCl solution was greater, while that in 0.85 mol/L NaCl solution was the lowest. In the case of 0.85 mol/L NaCl solution, the activity of Cl^- was weakened and the dissolved oxygen content decreases, hence the cathode reaction rate decreases. The results of potentiodynamic polarization curve and electrochemical impedance spectroscopy measurements demonstrate that the corrosion resistance of Al-alloy decreased at first and then increased during the galvanic corrosion process, the dissolution of Al-alloy was inhibited by the corrosion products formed on its surface. The corrosion rate of the steel was low at the early stage as cathode, and then the corrosion rate increased gradually with the increase of time. After immersion for 15 d, the corrosion products of steel participated in the cathodic reaction and therewith accelerated the rate of charge transfer, resulting in a decrease in the corrosion resistance of Al-alloy and steel, while their corrosion rate increased substantially.

Key words: 5083Al-alloy 30CrMnSiA steel galvanic corrosion concentration of Cl^- corrosion behavior

Received: 06 October 2020

ZTFLH:

TG172

Fund: General Projects of Equipment Pre-research Foundation(61409220202)

Corresponding Authors: LIU Zongde E-mail: lzd@ncepu.edu.cn

About author: LIU Zongde, E-mail: lzd@ncepu.edu.cn

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Cite this article:

LIU Quanbing, LIU Zongde, GUO Shengyang, XIAO Yi. Galvanic Corrosion Behavior of 5083 Al-alloy and 30CrMnSiA Steel in NaCl solutions. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 883-891.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.184 OR https://www.jcscp.org/EN/Y2021/V41/I6/883

Table 1 Chemical compositions of 5083 Al-alloy and 30CrMnSiA steel

Fig.1 Macroscopic morphologies of the couple of 5083 Al-alloy and 30CrMnSiA steel after 1 d immersion in NaCl solutions with the Cl^- concentrations of 0.05 mol/L (a), 0.1 mol/L (b), 0.6 mol/L (c) and 0.85 mol/L (d)

Fig.2 SEM surface morphologies of 5083Al-alloy in the couple after 1 d immersion in NaCl solutions with the Cl^- concentrations of 0.05 mol/L (a), 0.1 mol/L (b), 0.6 mol/L (c) and 0.85 mol/L (d)

Fig.3 SEM surface morphologies of 5083Al-alloy (a~d) and 30CrMnSiA steel in the couple (e~h) after 15 d immersion in NaCl solutions with the Cl^- concentrations of 0.05 mol/L (a, e); 0.1 mol/L (b, f); 0.6 mol/L (c, g) and 0.85 mol/L (d, h)

Table 2 EDS analysis results of the corrosion products formed on 5083Al-alloy in the couple after 15 d immersion in the NaCl solutions with different concentrations (mass fraction / %)

Fig.4 XRD patterns of the corrosion products formed on 5083Al-alloy (a) and 30CrMnSiA steel (b) after 15 d immersion in the NaCl solutions with different concentrations

Fig.5 Open circuit potential cures of 5083Al-alloy and 30CrMnSiA steel in 0.6 mol/L NaCl solution

Fig.6 Potentiodynamic polarization cures of 5083Al-alloy (a) and 30CrMnSiA steel (b) in NaCl solutions with different concentrations

Table 3 Fitting electrochemical parameters of 5083Al-alloy and 30CrMnSiA steel in NaCl solutions with different concentrations

Fig.7 Galvanic current densities (a) and pH values (b) of 5083Al-alloy and 30CrMnSiA steel couple during immersion in NaCl solutions with different concentrations

Fig.8 Potentiodynamic polarization cures of 5083 Al-alloy (a) and 30CrMnSiA steel (b) after immersion in 0.6 mol/L NaCl solution for different time

Table 4 Fitting electrochemical parameters of 5083 Al-alloy and 30CrMnSiA steel after immersion in 0.6 mol/L NaCl solution for different time

Fig.9 Nyquist (a, b) and Bode (c, d) plots of the galvanic coupling of 5083 Al-alloy (a, c) and 30CrMnSiA steel (b, d) after immersion in 0.6 mol/L NaCl solution for different time

Fig.10 Equivalent circuit models of EIS of 5083Al-alloy and 30CrMnSiA steel (a) Initial stage for 5083 Al-alloy, (b) final stage for 5083 Al-alloy, (c) for 30CrMnSiA steel

Table 5 Fitting equivalent circuit parameters of EIS of 5083 Al-alloy immersed for different time

Table 6 Fitting equivalent circuit parameters of EIS of 30CrMnSiA steel immersed for different time

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