LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA

doi:10.3724/SP.J.1037.2013.00417

Acta Metall Sin

2014, Vol. 50

Issue (1): 49-56 DOI: 10.3724/SP.J.1037.2013.00417

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LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA

WANG Binbin, WANG Zhenyao(

), CAO Gongwang, LIU Yanjie, KE Wei

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

WANG Binbin, WANG Zhenyao, CAO Gongwang, LIU Yanjie, KE Wei. LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA. Acta Metall Sin, 2014, 50(1): 49-56.

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Abstract

Localized corrosion behavior of aluminum alloy 2024 with/without cladding exposed to salt lakes atmospheric environment in western china for 4 a was investigated. The depth of pitting, corrosion products, morphology of surface and cross-section, and corrosion potential were analyzed by SEM/EDS, OM, XRD and electrochemical analysis system. The results showed that 2024 suffered severe pitting corrosion. The cladding layer of aluminum alloy 2024 exposed for 2 a had been penetrated. Depth of pitting of aluminum alloy 2024 without cladding after 2 a exposure had reached 320 μm; meanwhile, few pitting that penetrated the whole substrate of aluminum alloy 2024 without cladding had been observed. A main corrosion product of aluminum alloy 2024 with/without cladding—[Mg_1-_xAl_x(OH)₂]^x⁺ (Cl^-, CO^2-)_x·mH₂O (layered double hydroxides, LDH) was determined. Also, the results of electrochemistry indicated that the corrosion potential of aluminum alloy 2024 decreased gradually with the concentration of Cl^- increasing. The effects of factors of salt lake atmospheric environments, corrosion product and Cl^- concentration on the corrosion behavior of 2024 with/without cladding were discussed.

Key words: aluminum alloy 2024 salt lake atmospheric corrosion pitting corrosion corrosion product

Received: 16 July 2013

ZTFLH:

TG178

Fund: Supported by National Natural Science Foundation of China No.51131007 and Foundation Project of National Defense Technology No.H102011B002

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	Binbin WANG
	Zhenyao WANG
	Gongwang CAO
	Yanjie LIU
	Wei KE

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00417 OR https://www.ams.org.cn/EN/Y2014/V50/I1/49

Fig.1

无包铝的2024铝合金点蚀坑深度随时间的变化曲线

Fig.2

暴露不同周期的无包铝的2024铝合金点蚀坑截面形貌图

Fig.3

暴露1 a后2024的朝天面包铝层腐蚀截面形貌

Fig.4

暴露2 a后2024的包铝层截面形貌

Fig.5

暴露2 a的2024包铝层下基体的晶间腐蚀

Fig.6

暴露2 a包铝的2024铝合金的表面和截面形貌及腐蚀产物EDS分析

Fig.7

暴露不同时间的2024试样表面腐蚀产物及土壤物质XRD谱

Fig.8

2024铝合金在稀释不同倍数盐湖水中开路电位随时间的变化

Fig.9

2024铝合金在不同稀释倍数盐湖水中的阳极极化曲线

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