在模拟酸性海洋大气环境中锌缓蚀剂的研制

摘要

Objective To inhibit the corrosion of zinc in atmosphere environment by looking for corrosion inhibitor formula-tions.MethodsThe inhibition behaviors of sodium polyphosphate and its mixtures with vanillin, potassium iodide and thiourea individually on zinc corrosion in simulated acidic marine atmosphere were investigated by means of static weight-loss test, po-larization curve method and AC impedance spectroscopy.Results The result of static weight-loss test indicated that sodium po-lyphosphate and its mixtures all protected zinc from corrosion in simulated acidic marine atmosphere. The best quality ratios of sodium polyphosphate with vanillin, potassium iodide and thiourea individually were 3∶1, 1∶2 and 1∶4. Moreover, accord-ing to the result of the electrochemical test, it was found that sodium polyphosphate and its mixtures were mixed-type inhibitors and inhibited both of the cathodic reaction and the anode reaction. Sodium polyphosphate and its mixtures were able to form a layer of protective film on the surface of zinc, so as to inhibit the corrosion of zinc.Conclusion The corrosion inhibitor formula-tions can inhibit atmospheric corrosion of zinc effectively.%目的：寻找有效抑制锌大气腐蚀的缓蚀剂配方。方法采用静态失重法、极化曲线法和交流阻抗法，研究模拟酸性海洋大气环境中，多聚磷酸钠单独使用以及分别与香草醛、碘化钾、硫脲复配使用时对锌腐蚀的缓蚀作用。结果多聚磷酸钠单独使用时对腐蚀介质中的锌具有较好的缓蚀作用，多聚磷酸钠与香草醛、碘化钾、硫脲之间有良好的协同缓蚀效应，最佳质量配比分别为3∶1，1∶2，1∶4。多聚磷酸钠以及多聚磷酸钠复配缓蚀剂属于混合抑制型缓蚀剂；它们能够在锌表面形成一层保护膜，从而抑制锌的腐蚀。结论寻找到的缓蚀剂配方能够有效抑制锌的大气腐蚀。