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  

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

作　　者：王彬彬[1] 王振尧[1] 曹公望 钟西舟 柯伟[1] 

机构地区：[1]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

出　　处：《中国腐蚀与防护学报》2014年第3期287-293,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：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

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。Atmospheric corrosion behavior of U-bended aluminum alloy plates of LY12 and LC4with/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.

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 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG172[金属学及工艺—金属材料]