6061-T4铝合金在盐雾环境中的腐蚀行为  

Corrosion Behavior of 6061-T4 Aluminum Alloy in Salt Spray Environment

作　　者：刘伟 李洪林[1] 吴海旭 石玲 LIU Wei;LI Hong-lin;WU Hai-xu;SHI Ling(Liaoning Zhongwang Group Co.,Ltd.,Liaoyang 111000,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]辽宁忠旺集团有限公司,辽宁辽阳111000 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《材料保护》2022年第11期37-43,共7页Materials Protection

基　　金：辽宁省科技厅自然科学基金项目(20170540588);辽宁省博士科研启动基金项目(20180540057);辽宁省教育厅项目(L2020030)资助。

摘　　要：为了明确6061-T4铝合金在含Cl^(-)腐蚀环境中的动态腐蚀过程与腐蚀行为特征,采用失重分析、电化学分析、扫描电镜、红外光谱、腐蚀动力学等分析方法,研究了6061-T4铝合金在盐雾环境中的腐蚀行为。结果表明:在盐雾环境中,6061-T4铝合金的失重逐渐增加,但是腐蚀失重速率呈先增大后逐渐减小的变化趋势,在电化学测试中体现为自腐蚀电位先负移、后正移,腐蚀电流密度先增大、后减小;在腐蚀过程中,由于腐蚀产物的沉积,铝合金表面生成一层结构疏松且存在大量裂纹、裂隙的腐蚀产物层,该腐蚀产物层主要由Al(OH)_(3)与AlCl_(3)组成,对材料基体具有一定的保护作用,是6061-T4铝合金在盐雾环境中的腐蚀速率呈现先加快后逐渐降低变化趋势的主要原因。In order to clarify the dynamic corrosion process and corrosion behavior characteristics of 6061-T4 aluminum alloy in the corrosion environment containing Cl ions,the corrosion behavior of 6061-T4 aluminum alloy in salt spray environment was investigated by weight loss analysis,electrochemical analysis,scanning electron microscopy,infrared spectroscopy,corrosion kinetics and other analytical methods.Results showed that in the salt spray environment,the weight loss of 6061-T4 aluminum alloy gradually increased,but the corrosion weight loss rate increased first and then decreased gradually.In the electrochemical test,the self-corrosion potential shifted negatively first and then positively,and the corrosion current density first increased and then decreased.Moreover,during the corrosion process,due to the deposition of corrosion products,a layer of corrosion products with a loose structure and a large number of cracks and fissures was formed on the surface of the aluminum alloy.The corrosion product layer was mainly composed of Al(OH)_(3)and AlCl_(3),which had a certain protective effect on the substrate and caused the corrosion rate of 6061-T4 aluminum alloy to show a trend of increasing first and then decreasing gradually in the salt spray environment.

关 键 词：铝合金 盐雾 腐蚀产物 腐蚀动力学 腐蚀行为 

分 类 号：TG172[金属学及工艺—金属表面处理]