Atmospheric Corrosion Behavior of Pre-strained Aluminum Alloys LY12 and LC4 in Salt Lake Environment in Western China

doi:10.11902/1005.4537.2013.150

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 287-293 DOI: 10.11902/1005.4537.2013.150

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Atmospheric Corrosion Behavior of Pre-strained Aluminum Alloys LY12 and LC4 in Salt Lake Environment in Western China

WANG Binbin, WANG Zhenyao(

), CAO Gongwang, ZHONG Xizhou, KE Wei

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

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Abstract

Atmospheric corrosion behavior of U-bended aluminum alloy plates of LY12 and LC4 with/without Al cladding was investigated by field exposure in salt lake environment in Western China for 2 a. Then their surface and cross-sectional morphology was examined by metalloscope and SEM. The results showed that the corrosion behavior of the Al clad alloys LY12 and LC4 was mainly pitting corrosion within the cladding and no pits penertrating the cladding could be observed after 2 a exposure. For the bare alloys LY12 and LC4, severe stress corrosion cracking (SCC) was observed in the test. Both tensile- and compressive-stress could lead to SCC in for LY12, while only tensile stress could induce SCC for LC4 during the exposure. Exfoliation corrosion (EFC) of LY12 and LC4 occurred under compressive stress but not under tensile stress.

Key words: LY12 alloy LC4 alloy salt-lake atmospheric environment SCC EFC

Received: 29 October 2013

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Cite this article:

WANG Binbin, WANG Zhenyao, CAO Gongwang, ZHONG Xizhou, KE Wei. Atmospheric Corrosion Behavior of Pre-strained Aluminum Alloys LY12 and LC4 in Salt Lake Environment in Western China. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 287-293.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.150 OR https://www.jcscp.org/EN/Y2014/V34/I3/287

Table 1 Chemical compositions of LY12 and LC4 alloy (mass fraction / %)

Fig.1

暴露2 a后包铝的LY12铝合金朝地面的表面形貌

Fig.2

暴露2 a后包铝的LY12铝合金的截面形貌

Fig.3

无包铝的LY12铝合金暴露不同时间的截面处应力腐蚀裂纹

Fig.4

LY12大气暴露2 a并蚀刻后的应力腐蚀裂纹形貌

Fig.5

无包铝LC4铝合金大气暴露2 a的截面处应力腐蚀裂纹和蚀刻后形貌

Fig.6

大气暴露1 a的LC4铝合金断口处的微观形貌

Fig.7

无包铝的LY12和LC4铝合金大气暴露2 a后的剥层腐蚀形貌

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