挤压态AZ31镁合金板的电化学腐蚀行为  

Electrochemical Corrosion Behavior of As-extruded AZ31 Magnesium Alloy Plate

作　　者：杨秉烨 卜少科 吴博 张桐桐 何永胜[3] 罗文忠[3] YANG Bingye;PU Shaoke;WU Bo;ZHANG Tongtong;HE Yongsheng;LUO Wenzhong(The Second Military Representative Office of the Air Force's Equipment Department in Xi'an,Xi'an 710016,China;Ninth Military Representative Office of the Air Force's Equipment Department in Xi'an,Xi'an 710016,China;Western Superconducting Technologies Co.,Ltd.,Xi'an 710016,China)

机构地区：[1]空装驻西安第二军代室,陕西西安710016 [2]空装驻西安第九军代室,陕西西安710016 [3]西部超导材料科技股份有限公司,陕西西安710016

出　　处：《热加工工艺》2023年第15期34-37,共4页Hot Working Technology

摘　　要：利用电化学测试评价了挤压态AZ31镁合金板材的耐腐蚀性能,对比研究了挤压态AZ31镁合金板材ED-ND面和TD-ND面(ND、TD、ED分别为厚度、宽度、挤压方向)在3.5%NaCl溶液中的腐蚀行为。结果表明:挤压态AZ31镁合金板材TD-ND面的晶粒尺寸更加细小,挤压态AZ31镁合金板两个面上的腐蚀均是从局部丝状腐蚀逐渐转变为点蚀;与ED-ND面的对比,TD-ND面的腐蚀产物分布更均匀、致密,TD-ND面的自腐蚀电位为-1.31 V,高于ED-ND面的自腐蚀电位,TD-ND面展现出更好的耐腐蚀性能,这主要是因为TD-ND面晶粒细小导致表面形成了分布均匀且致密性高的氧化膜,减缓了镁合金表面的电化学腐蚀。The corrosion resistance of as-extruded Az31 magnesium alloy plate was evaluated by electrochemical test,and the corrosion behavior of ED-ND and TD-ND section of as-extruded AZ31 magnesium alloy plate(ND,TD,ED is thickness,width and extrusiondirection respectively)in 3.5%NaCl solution was compared.The results show that the grain size of the TD-ND section of the as-extruded AZ31 magnesium alloy plate is smaller.The corrosion of as-extruded AZ31 magnesium alloy plate on the two sections is gradually changed from local filamentary corrosion to point corrosion.Compared with those of ED-ND section,the corrosion product on TD-ND section is much uniform and dense.The self-corrosion potential value of TD-ND section is-1.31 V,which is higher than that of the ED-ND section.The TD-ND section has higher corrosion resistance.Because the grain refinement leads to the uniformity and compactness of passivation film on the TD-ND section of the alloy,therefore reduces the electrochemical corrosion on the section of the magnesium alloy.

关 键 词：AZ31镁合金 电化学行为 腐蚀 表面形貌 

分 类 号：TG379[金属学及工艺—金属压力加工]