受力的LY12和LC4铝合金在中国西部盐湖大气环境中的腐蚀行为

doi:10.11902/1005.4537.2013.150

中国腐蚀与防护学报

2014, Vol. 34

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

本期目录 | 过刊浏览

受力的LY12和LC4铝合金在中国西部盐湖大气环境中的腐蚀行为

王彬彬, 王振尧(

), 曹公望, 钟西舟, 柯伟

中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

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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摘要:

通过现场大气暴露实验,利用金相显微镜和SEM等手段分析试样表面和截面形貌,研究了U弯受力状态下包铝与无包铝的LY12和LC4两种铝合金在我国西部盐湖大气环境中的腐蚀行为。结果表明,包铝的两种铝合金的腐蚀主要发生在包铝层,以点蚀为主,未观察到包铝层被穿透现象。无包铝的铝合金试样都发生了明显的沿晶应力腐蚀开裂,其中LY12铝合金在拉应力和压应力下都有较多的应力腐蚀裂纹,LC4铝合金只在拉应力下观察到了裂纹；两种铝合金在压应力下都发生了剥层腐蚀,拉应力下剥层腐蚀受到抑制。

关键词 ： LY12铝合金, LC4铝合金, 盐湖大气环境, 应力腐蚀开裂, 剥层腐蚀

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

收稿日期: 2013-10-29

ZTFLH:

TG174

基金资助:国家自然科学基金重点项目(51131007);国防技术基础项目(H102011B002);国家电网科技项目(KG12K16004和5211DS110493)资助

作者简介: null

王彬彬，男，1985年生，博士生，研究方向为材料大气腐蚀

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引用本文:

王彬彬, 王振尧, 曹公望, 钟西舟, 柯伟. 受力的LY12和LC4铝合金在中国西部盐湖大气环境中的腐蚀行为[J]. 中国腐蚀与防护学报, 2014, 34(3): 287-293.
Binbin WANG, Zhenyao WANG, Gongwang CAO, Xizhou ZHONG, Wei KE. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.150 或 https://www.jcscp.org/CN/Y2014/V34/I3/287

表1 LY12和LC4两种实验材料的化学成分

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