通过失重法、线性电位扫描、动电位扫描、电化学阻抗谱等分析手段,研究 AZ63 镁合金在 NaCl溶液中的孔蚀行为,考察缓蚀剂磷酸钠和复配剂氟化钠对 AZ63 镁合金孔蚀的影响,并用扫描电镜观察 AZ63 镁合金的腐蚀形貌。 结果表明:NaCl 溶液浓度增加会使镁合金的孔蚀倾向增大,但 NaCl 质量分数超过 5 . 5% 后,击穿电位与再钝化电位差值的下降幅度显著减小; Na₃PO₄ 能够有效阻止 AZ63 镁合金在氯化钠溶液中的腐蚀,PO₄^3-浓度增加使 E_b 值增大,2 . 0% Na₃PO₄ 对镁合金的缓蚀率达到 92 . 8% ;NaF 溶液与 Na₃PO₄ 复配可减缓 AZ63镁合金的腐蚀速度,添加 0 . 16% NaF 时,极化电阻增大至 3092 Ω·cm²。

Pitting behavior of AZ63 magnesium alloy in sodium chloride solution was investigated by weight-loss measurement , linear sweep voltammetry ( LSV) , staircase voltammetry ( SCV) and electrochemical impedance spectroscopy ( EIS) .Influence of trisodium phosphate and sodium fluoride on the corrosion inhibition of AZ63 magnesium alloy was observed. The surface morphology of the alloy was observed with scanning electron microscope ( SEM) . The results show that higher Cl concentration results in higher pitting corrosion tendencies. However, the values of E_b-E_rpdecreased gradually when Cl concentration went beyond 5 . 5 % . The pitting corrosion tendencies of the alloy in high sodium chloride concentration solution were greater than in lower concentration solution. The corrosion rate of magnesium alloy could decrease by using trisodium phosphate as corrosion inhibitor, and pitting potential E_bincreased with the increasing of PO^3-₄concentration. When the mass fraction of trisodium phosphate was 2 . 0 % , the inhibitive efficiency of AZ63 magnesium alloy was 92 . 8 % . The corrosion rate of AZ63 magnesium alloy decreased, and the resistance value was 3092 Ω·cm²when 0 . 16 % sodium fluoride and 2 . 0 % Na₃PO₄ were used as compound agent .