中文摘要：

采用电化学阻抗谱（EIS）、极化曲线和微观表面形貌分析研究不同浓度的海藻酸钠对AZ31镁合金在模拟汽车冷却液中的缓蚀作用。结果表明：0．005g／L的海藻酸钠能够明显抑制AZ31镁合金在模拟汽车冷却液中的腐蚀，但随着浓度的继续增加海藻酸钠的缓蚀能力有所下降。海藻酸钠是一种抑制镁合金阴极析氢反应的阴极型缓蚀剂。

英文摘要：

The inhibition of sodium alginate on AZ31 magnesium alloy corrosion in simulated automotive coolant was investigated by electrochemical impedance spectroscopy （EIS） and polarization curves measurement. Results show that sodium alginate of 0. 005 g/L had good inhibitive effect on the corrosion of AZ31 magnesium alloy. Sodium alginate is a cathodic type corrosion inhibitor and retards the hydrogen evolution of AZ31magnesium alloy.