Corrosion Behaviour and Characteristics of 1050A Al-alloy Exposed in Typical Atmospheres of Shandong Province

doi:10.11902/1005.4537.2023.321

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 1055-1063 DOI: 10.11902/1005.4537.2023.321

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Corrosion Behaviour and Characteristics of 1050A Al-alloy Exposed in Typical Atmospheres of Shandong Province

FAN Zhibin(

), GAO Zhiyue, ZONG Lijun, WU Yaping, LI Xingeng, JIANG Bo, DU Baoshuai

State Grid Shandong Electric Power Research Institute, Ji'nan 250001, China

Cite this article:

FAN Zhibin, GAO Zhiyue, ZONG Lijun, WU Yaping, LI Xingeng, JIANG Bo, DU Baoshuai. Corrosion Behaviour and Characteristics of 1050A Al-alloy Exposed in Typical Atmospheres of Shandong Province. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1055-1063.

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Abstract

A natural exposure test of 1050A Al-alloy was conducted in the typical atmospheric environments in the regions Qingdao, Dongying, Weihai and Weifang of Shandong Province for a period of 42 months. Afterwards, the corrosion behavior of the alloy was studied by means of macroscopic- and microscopic-morphology observation, corrosion rate measurement, corrosion product analysis and electrochemical test. The results show that 1050A Al-alloy has good atmospheric corrosion resistance, and the corrosion rate decreases with the increasing exposure time. Corrosion products are mainly Al-oxide and -hydroxide. The corrosion rate of 1050A Al-alloy tested at four different test sites may be ranked as following descending order: Dongying>Weihai>Qingdao>Weifang. The corrosion rate decreases with the extension of exposure time, which may be related to the presence of corrosion product scale. The laser confocal microscopic morphology analysis reveals that the corrosion is mainly pitting corrosion. The size of Pits was mainly below 10 μm after 42 months of exposure. The EIS result indicates that there exists a discernible discrepancy in the corrosion extent between the upward- and downward-sides of the test coupons at the initial exposure stage, which then gradually diminishes as the exposure time prolongs.

Key words: Al-alloy atmospheric corrosion corrosion rate corrosion characteristics

Received: 10 October 2023 32134.14.1005.4537.2023.321

ZTFLH:

TG147

Fund: Science and Technology Project of State Grid Corporation(5200-202016471A-0-0-00)

Corresponding Authors: FAN Zhibin, E-mail: fan200403707@163.com

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	FAN Zhibin
	GAO Zhiyue
	ZONG Lijun
	WU Yaping
	LI Xingeng
	JIANG Bo
	DU Baoshuai

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.321 OR https://www.jcscp.org/EN/Y2024/V44/I4/1055

Fig.1 Macroscopic morphologies of the front (a1-h1) and back (a2-h2) surfaces of 1050A Al-alloy samples after atmospheric exposure in Qingdao (a, b), Dongying (c, d), Weihai (e, f) and Weifang (g, h) for 12 months (a, c, e, g) and 42 months (b, d, f, h)

Fig.2 Corrosion rates of 1050A Al-alloy exposed to the atmospheric environments of Qingdao, Dongying, Weihai and Weifang in Shandong province

Fig.3 Raman spectroscopies of 1050A Al-alloy after atmospheric exposure in Qingdao, Dongying, Weihai and Weifang for 12 months (a, b) and 42 months (c, d)

Table 1 Corresponding positions of Raman peaks for various samples in Fig.3^[25~30]

Fig.4 LSCM images of the front and back surfaces of 1050A Al-alloy samples after atmospheric exposure in Qingdao (a, b), Dongying (c, d), Weihai (e, f) and Weifang (g, h) for 42 months, respectively

Fig.5 Statistical diagrams (a, c) and cumulative probabilities (b, d) of pits for the samples after atmospheric exposure in the typical cities of Shandong province for 12 months (a, b) and 42 months (c, d)

Fig.6 EIS of 1050A Al-alloy exposed atmospherically to Qingdao (a), Dongying (b), Weihai (c) and Weifang (d)

Fig.7 Equivalent circuit model of EIS of 1050A Al-alloy

Fig.8 Polarization resistances of 1050A Al-alloy after atmospheric exposure in typical four cities of Shandong province

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