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为抑制AZ31镁合金在3.5%Na Cl溶液中的腐蚀,提高其活化性能,用电化学等方法研究酒石酸钾钠(KNa C4H4O6)对AZ31镁合金电化学行为的影响。结果表明:KNa C4H4O6能抑制AZ31镁合金的腐蚀,但极化程度有所增大;当KNa C4H4O6的质量分数为1.0%,AZ31的缓蚀率高达61.2%,自腐蚀电流密度最小(0.005 6 m A/cm2),腐蚀后其表面均匀,且活化性能有所改善;在-1.0 V下合金的电流密度高达41.1 m A/cm2,开路电位Eocp负移程度最大(-1.594 V),活化电位Eact负移程度也最大(-1.30 V)。试验结果为AZ31镁合金作为电极材料提供参考。
In order to inhibit the corrosion of AZ31 magnesium alloy in 3.5% NaCl solution and improve its activation performance, electrochemical methods were used to study the influence of sodium potassium tartrate (KNa C4H4O6) on the electrochemical behavior of AZ31 magnesium alloy. The results show that KNa C4H4O6 can inhibit the corrosion of AZ31 magnesium alloy, but the degree of polarization increases. When the mass fraction of KNa C4H4O6 is 1.0%, the corrosion inhibition rate of AZ31 is up to 61.2% and the corrosion current density is the smallest (0.005 6 m A / cm2). The surface of the alloy was uniform after etching and its activation performance was improved. Under -1.0 V, the current density of the alloy was as high as 41.1 m A / cm2, the open circuit potential Eocp had the largest negative shift of -1.594 V and the activation potential Eact Negative shift is also the largest (-1.30 V). The test results provide reference for AZ31 magnesium alloy as electrode material.