热水器用AZ31B型镁合金牺牲阳极挤压棒电化学性能测试研究  

Electrochemical properties study of AZ31B magnesium alloy sacrificial anode extruded rod used in water heater

作　　者：赵建峰 钱亚锋 吴洋 ZHAO Jianfeng;QIAN Yafeng;WU Yang(National Centre for Quality Supervision and Inspection of Magnesium and Magnesium Alloy Products,Hebi 458030,Henan,China)

机构地区：[1]国家镁及镁合金产品质量监督检验中心,河南鹤壁458030

出　　处：《化学研究》2023年第2期147-152,共6页Chemical Research

基　　金：国家标准修订(国标委发[2020]6号20200718-T-610)。

摘　　要：采用ICP-AES法、电化学性能14 d测试法测定热水器用镁合金牺牲阳极棒中的合金元素含量、开路电位、闭路电位、实际电容量、电流效率等参数,通过金相显微镜、扫描电镜-X射线能谱分析仪表征腐蚀表面结构。结果表明:镁合金牺牲阳极中合金元素Al、Zn、Mn含量分别为2.887%、0.849%、0.669%,开路电位、闭路电位、实际电容量与电流效率分别为-1.6295 V、-1.5375 V、1327.6 A·h/kg、60.4%,分析测试值均符合GB/T17731-2015规范要求;合金晶粒清晰可见,晶界分明,表面腐蚀较为均匀,表明AZ31B型镁合金牺牲阳极材质结构性能较好。The data of alloying element content,open circuit potential,closed circuit potential,actual capacitance and current efficiency of magnesium alloy sacrificial anode rod for water heater were determined by inductively coupled plasma-atomic emission spectrometry and 14 d electrochemical performance test.The the corrosion surface structure was analyzed by metallographic microscope and scanning electron mictoscopy-X-ray energy dispersive analysis.The results showed that the contents of alloying elements Al,Zn and Mn in sacrificial anode of magnesium alloy were 2.887%、0.849%、0.669%respectively,and the open circuit potential,closed circuit potential,actual capacitance and current efficiency were-1.6295 V,-1.5375 V,1327.6 A·h/kg and 60.4%,respectively,which were according to the requirements of GB/T17731-2015.The grain size of the alloy was clear and the corrosion on the grain boundary surface was uniform,which showed that the material structure performance of AZ31B magnesium alloy sacrificial anode was better.

关 键 词：热水器 镁合金牺牲阳极 挤压棒材 电化学性能测试 ICP-AES法 

分 类 号：O657.12[理学—分析化学]