Al-Mg-Zn合金自腐蚀电位一成分三元图的建立及牺牲阳极保护试验

摘要

A series of Al-Mg-Zn alloys were prepared by flux melting in the atmosphere. The as-prepared alloys were investigated by electrochemical performance testing and anodic protection experiment. Al-Mg-Zn electrode potential-component ternary plot was established. The results show that when x and y were equal to 0.2-0. 6 and 0-0.4 respectively, the corrosion current density and free corrosion potential of alloys were very low, Ecorr was between -1.03 Vand -1.25 V（vs. SCE）, Jcorr was between 8. 7×10^-7 A/cm^2 and 5. 01×10^-5 A/cm^2. At the same time, Al0. 2 Mg0. 2 Zn0. 6 and Al0. 6 Mg0. 2 Zno. 2 alloys had a good protective effect for Q235 steel in the solution of 3.50% NaCl.%设计了系列成分的Al-Mg-Zn三元合金，采用大气造渣保护熔炼技术制备了Al-Mg-Zn合金铸锭，进行了电化学性能测试和阳极保护试验，建立了ALMg-Zn三元合金自腐蚀电位一成分图。发现Al，MgyZn1-x-y合金当32-0．2～0．6，y=0～0．4时，具有较低的自腐蚀电位和自腐蚀电流密度，分别为-1．03～-1．25V（vs．SCE）和8．7×10^-7-5．01×10^-5A／cm^2；同时，Al0.2Mg0.2 Zno6和Al0.6 Mg0.2 Zn0.2合金在3．5％NaCl溶液中对Q235钢具有良好的保护作用。