ga bi合金化alznsn系牺牲阳极材料及其热处理研究-study on ga bi alloying alz nsn sacrificial anode material and its heat treatment.docx

摘要性能。而 460℃保温 4h 固溶处理工艺能较好提高 Al-Zn-Sn-0.015Ga 合金综合性能，使合金电流效率95.0%且表面腐蚀均匀。固溶处理则能使 Al-Zn-Sn-Ga-Bi 合金在 电流效率降低不大的情况下，工作电位平稳，腐蚀形貌均匀。经过 480℃固溶， 该合金的开路电位为-1.071V(SCE)，工作电位-1.063V~-1.078V，电流效率达到 96.6%，综合电化学性能最好。结合微观组织特征和电化学分析手段，认为 Al-Zn-Sn-Ga-Bi 合金的活化过 程是有第二相优先溶解脱落机理和固溶的主活化元素 Ga 的溶解-再沉积机制共同 组成。铸态和退火态合金中第二相(偏析相)为数较多，在初始活化和溶解发展阶 段第二相的优先溶解脱落均占据优势，导致腐蚀纵深发展，形成局部腐蚀形貌。 合金固溶后，第二相数量大为减少，Ga 元素的溶解-再沉积过程控制了持续活化 步骤，此时横向扩展速度和纵向深入速度匹配较好，最终表现出均匀溶解形貌。关 键 词：铝基牺牲阳极材料，镓，合金化，热处理，活化机理 论文类型：应用基础研究II摘要Subject:Research on Al-Zn-Sn series Anode Materials of Ga, Bi alloying and Heat Treatment Specialty:Materials Science Name:Wang Guo-wei Supervisor: Wen Jiu-ba Professor ABSTRACTAluminum base anodes materials have been extensively researched for their advantages of high theoretical capacities, moderately operating potential abundance and accessibility. The research of improving electrochemical properties on Al-Zn-Sn-based anode alloy which current efficiency is just 70%~80% with the methods of micro alloying and heat treatment may developing new aluminum base anodes materials and would provide new options for engineering application. With studies on microstructure and electrochemical process, activation mechanism of aluminum those anode alloys which treated by micro alloying and heat treatment is examined further. And those researches still can enrich materials design and activation mechanism theories of aluminum alloy anode Further.Electrochemical properties of alloying (Gallium) and compound-alloying (Gallium and Bismuth) for Al-Zn-Sn-based anode alloy were researched in this paper. And effects of heat treatment for those Al-Zn-Sn series alloys were still studied. Microstructure was characterized by metallographic microscope, SEM and EDS. And electrochemical reaction process of aluminum base anode after compound alloying and heat treatment still studied by polarization curves and EIS. Activation mechanisms of Al-Zn-Sn micro alloying alloys and synergism relationship of those eleme