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采用浸泡法、电化学方法研究了海藻酸钠浓度对AZ91D镁合金新型复合缓蚀剂缓蚀效果的影响。利用极化曲线、交流阻抗(EIS)和失重法评价了该缓蚀剂的缓蚀作用。通过扫描电镜和能谱分析了试样的腐蚀形貌以及缓蚀机理。研究表明,随着海藻酸钠浓度的提高,缓蚀效率先增后减,当浓度为0.03mol/L时,缓蚀效率最高。海藻酸钠在试样表面形成吸附膜,与其他两种成分产生协同作用,从而提高了镁合金的耐蚀性。
The effect of sodium alginate concentration on corrosion inhibition of a new type of composite corrosion inhibitor AZ91D magnesium alloy was studied by immersion method and electrochemical method. The corrosion inhibition of the corrosion inhibitor was evaluated by polarization curve, alternating current impedance (EIS) and weight loss method. The corrosion morphology and corrosion inhibition mechanism were analyzed by SEM and EDS. The results showed that with the increase of sodium alginate concentration, the inhibition efficiency first increased and then decreased. When the concentration was 0.03 mol / L, the inhibition efficiency was the highest. Sodium alginate forms adsorption film on the surface of the sample and synergizes with the other two components to improve the corrosion resistance of the magnesium alloy.