摘要
结合汽车主机厂需求制备了轧制退火态、清洗态、钝化态三种表面预处理状态的5754铝合金板材,分析了其表面化学成分、微观形貌、粗糙度及润湿性,并研究了表面预处理状态对材料胶接及耐蚀性能的影响。结果表明:轧制退火态样品表面为疏松多孔的氧化铝涂层,清洗态样品表面为纳米级氧化铝薄膜,钝化态样品表面为致密的纳米级钛锆薄膜。三种状态表面预处理后粗糙度差异不大,与水滴的静态接触角从大到小依次是轧制退火态、钝化态、清洗态。影响5754铝合金表面预处理状态胶接性能的主要因素为表面润湿特性,清洗态样品润湿效果最好,胶接强度最高。影响耐蚀性能的主要因素为膜层的致密性,钝化态样品膜层最为致密,在电化学阻抗谱中容抗弧半径最大,可以有效抑制5754铝合金的全面腐蚀和单边腐蚀。主机厂可结合对胶接及耐蚀性能要求综合考虑5754铝合金选用哪种预处理进行交货。
The 5754 aluminum alloy sheets were prepared in three surface pre-treatment states of rolling annealing state,cleaning state and passivation state according to the require-ments of automobile OEMs.The surface chemical composition,microstructure,roughness and wettability were analyzed,and the effect of surface pretreatment on bonding and corro-sion resistance of the materral was studied.The results show that the surface of the rolled and annealed sample is the loose and porous alumina coating,the surface of the cleaned sample is the nano-scale alumina film,and that of the chemical state sample is the dense nano-scale titanium zirconium thin film.There is little difference in the surface roughness of the three states,the static contact angle with water droplets,in descending order,is rolling annealing state>passivation state>cleaning state.The main factor affecting the adhesion performance of 5754 aluminum alloy in different surface pre-treatment states is the surface wetting characteristics.The cleaning-state sample has the best wetting effect and the highest bonding strength.The main factor affecting the corrosion resistance is the compactness of the film.The passivated sample film is the most compact and has the largest capacitive arc radi-us in the electrochemical impedance spectroscopy,which can effectively inhibit the general corrosion and corrosion under the film of 5754 aluminum alloy.The OEMs can comprehen-sively consider the requirements for the pre-treatment of the 5754 aluminum alloy in combi-nation with the requirements for adhesive bonding and corrosion resistance performance.
作者
曹以恒
郑文瑄
李英东
刘萌
高文
CAO Yiheng;ZHENG Wenxuan;LI Yingdong;LIU Meng;GAO Wen(Chongqing National Innovation Institute of Light Alloys Co.,Ltd.,Chongqing 400039,China;Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209,China)
出处
《轻合金加工技术》
CAS
2024年第7期38-48,共11页
Light Alloy Fabrication Technology
基金
中国铝业集团公司青年科技人才启明星项目(2019MXJH05)。
关键词
5754铝合金
表面预处理
胶接性能
腐蚀性能
5754 aluminum alloy
surface pre-treatment
bonding performance
corro-sion resistance
