固溶处理对Al-Zn-In-Mg-Ti-Mn合金电化学性能的影响

EFFECT OF SOLUTION TREATMENT ON ELECTROCHEMICAL PERFORMANCE OF Al-Zn-In-Mg-Ti-Mn ALLOYS

研究了510℃×10 h固溶处理对Mn含量不同的Al-Zn-In-Mg-Ti-Mn合金在人造海水中的腐蚀电化学性能的影响.结果表明:固溶处理使该合金的电流效率下降,但对其自腐蚀电位影响不大;当合金中Mn含量较高时,固溶处理可改善其腐蚀过程中的表面腐蚀状况,降低工作电位,而电流效率下降不大;等效电路RS(C1(C2Rt)(QR)(L1Rad1)(L2Rad2)(L3Rad3))能较好地拟合该合金在3%NaCl溶液中腐蚀的EIS谱,基本反映了其电化学腐蚀过程.

Al-Zn-In-Mg-Ti-Mn alloys containing different manganese contents as anode materials were solution treated at 510℃ for 10 h. The effect of heat treatment on electrochemical performance of the alloy such as operating potential, dissolution of anode and current efficiency, as well as their electrochemical bebavior in artificial seawater were researched. The results show that solution treatment reduces the current efficiency of aluminum alloys, but the effect of solution treatment on the open circuit potential is not ap- parent. When the manganese content is high, solution treatment can improve the surface dissolution status and decrease the operating potential with the current efficiency dropped little. EIS of A1-Zn-In-Mg-Ti-Mn alloy in 3% NaC1 solution are farewell fitted with an equivalent circuit Rs （C1 （C2R1）（QR） （L1Rad1 ） （ L2Rad2 ） （ L3Rad3 ） ） precisely ,which can primarily reveal the nature of electrochemical corrosion process.