Corrosion Behavior of Cu-Al Laminated Board in Neutral Salt Fog Environment

doi:10.11902/1005.4537.2020.217

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (2): 241-247 DOI: 10.11902/1005.4537.2020.217

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Corrosion Behavior of Cu-Al Laminated Board in Neutral Salt Fog Environment

ZHANG Yifan, YUAN Xiaoguang, HUANG Hongjun, ZUO Xiaojiao(

), CHENG Yulin

Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

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Abstract

The corrosion behavior of Cu-Al laminated boards was investigated by means of indoor neutral salt spray test, aiming to simulate the atmospheric environment induced corrosion, and electrochemical workstation, as well as scanning electron microscopy (SEM) with energy spectrometer (EDS), and X-ray diffractometer (XRD). The results show that Cu- and Al-laminates act as corrosion galvanic couple in salt spray environment, where the Cu plays as cathode, while Al as anode. The greater the area ratio of cathode to anode, the greater the corrosion rate. As the corrosion continued, the corrosion mainly occurred on the Al plate , and the corrosion was the most serious near the interface of the Cu-Al plates, serious denudation corrosion may appear on the Al-plate for long-term corrosion, while the Cu plate has almost no change. The corrosion products composed mainly of Al₂O₃, Al(OH)₃ and AlO(OH). The electrochemical results show that during the corrosion process, the corrosion rate of Cu-Al composite laminated board increased firstly, then decreased and finally increased again.

Key words: copper-aluminum laminated plate salt fog corrosion electrochemical mass loss corrosion product

Received: 29 October 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(U1604251);Liaoning Province PhD Foundation;Programme(2019-BS-178)

Corresponding Authors: ZUO Xiaojiao E-mail: kz_candy@163.com

About author: ZUO Xiaojiao, E-mail: kz_candy@163.com

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Cite this article:

ZHANG Yifan, YUAN Xiaoguang, HUANG Hongjun, ZUO Xiaojiao, CHENG Yulin. Corrosion Behavior of Cu-Al Laminated Board in Neutral Salt Fog Environment. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 241-247.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.217 OR https://www.jcscp.org/EN/Y2021/V41/I2/241

Fig.1 Structure schematic of Cu/Al clad plates

Fig.2 Polarization curves of Cu/Al clad plates with different area ratio of cathode to anode

Table 1 Fitting values of polarization curves

Fig.3 Nyquist (a) and Bode (b) plots of Cu/Al clad plates with different area ratio of cathode to anode

Fig.4 Electrochemical equivalent circuit of AC impedance spectrum: (a) one-time constant, (b) two-time constant

Table 2 Fitting values of various parameters based on AC impedance spectrum

Fig.5 Polarization curves of Cu/Al clad plates after salt fog corrosion for different time

Table 3 Fitting values of polarization curves

Fig.6 Nyquist (a) and Bode (b) plots of Cu/Al clad plates after salt fog corrosion for different time

Table 4 Fitting values of various parameters based on AC impedance spectrum

Fig.7 Interface morphology images of Cu/Al clad plates after salt fog corrosion for 0 h (a), 24 h (b), 144 h (c) and 240 h (d)

Fig.8 XRD patterns (a) and EDS analysis (b) of composition of corrosion products

Fig.9 Corrosion kinetics curve after salt fag corrosion

Fig.10 Schematic diagram of salt fog corrosion of Cu/Al clad plates

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