热处理对Al-Zn-Sn-Ga合金组织及电化学性能的影响  

Effects of heat treatment on microstructure and electrochemical performance of Al-Zn-Sn-Ga alloy

作　　者：贺俊光[1] 文九巴[1] 周旭东[1] 王国伟 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]太阳雨太阳能有限公司,江苏连云港222000

出　　处：《材料热处理学报》2013年第6期69-74,共6页Transactions of Materials and Heat Treatment

基　　金：河南省科技创新杰出人才计划(094200510019);河南省自然科学基金项目(092300410132)

摘　　要：针对Al-7Zn-0.1Sn-0.015Ga(质量分数,%)牺牲阳极的腐蚀均匀性有待进一步提高的问题,采用扫描电镜(SEM)、恒电流极化、动电位极化等方法,研究了退火和固溶处理对其微观组织、电流效率和腐蚀形貌等的影响。结果显示:热处理工艺可减小合金元素的偏析程度,改善合金组织的不均匀性;退火处理使合金的电位正移,自腐蚀电流密度和析氢腐蚀速率升高,且电流效率大大降低,溶解形貌虽有改善但仍不均匀;固溶处理可降低该合金的电位,抑制析氢腐蚀,电流效率虽稍降低但能明显改善合金的腐蚀形貌。经固溶处理后该阳极的电流效率达94.6%,工作电位负而稳定,腐蚀形貌均匀,具有较好的综合电化学性能。To improve the corrosion uniformity of A1-7Zn-0. 1Sn-0. 015Ga （mass,%） sacrificial anode, influence of thermal treatment （annealing or solid solution） on microstructure, current efficiency and corrosion morphology of the alloy were investigated by means of scanning electron microscopy （SEM） , galvanostatic and potentiodynamic polarizations. The results show that the heat treatment reduces the grain boundary segregation and improves the uniformity of the alloy. Annealing treatment makes the potential shifts towards positive, the corrosion current density and hydrogen evolution increase, the current efficiency is greatly reduced, the dissolved morphology is improved but still uneven. The solution treatment drops the potential, represses the hydrogen evolution, lowers the current efficiency slightly, and improves the corrosion morphology significantly. The alloy treated by solid solution has a current efficiency of 94.6% , the negative working potential and uniform corrosion feature, indicating better electrochemical properties.

关 键 词：热处理 牺牲阳极 组织 电化学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]