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用冷喷涂技术制备Cu-Cu2O涂层,研究了其在不同海水环境下的极化行为,并建立了涂层的腐蚀过程数学模型。结果表明:在浸泡的初期Cu2O促进了涂层的局部腐蚀;随着浸泡时间的增加局部腐蚀产物进一步促进了表面氧化膜的形成;在非搅拌的静态环境下,涂层的腐蚀受CuCl2-扩散的控制;Cl-促进了涂层的腐蚀,阻碍氧化膜的形成,且Cl-对CuCl的络合是Cl-浓度的一级反应;在CuCl向Cu2O转变的过程中产生H+,使电极表面附近溶液的pH值降低,阻碍氧化膜的形成和降低耐久性,而在溶液中加入Na2B4O7-H3BO4缓冲体系,能有效地提高氧化膜的击破电位。根据本文提出的反应过程数学模型进行计算的结果,与实验结果具有很好的相符性。
The Cu-Cu2O coating was prepared by cold spraying technique and its polarization behavior under different seawater conditions was studied. A mathematical model of the corrosion process of the coating was established. The results showed that Cu2O promoted the local corrosion of the coating in the initial stage of soaking. The local corrosion products further promoted the formation of the surface oxide film with the increase of immersion time. The corrosion of the coating was affected by CuCl2-diffusion Cl- promotes the corrosion of the coating and hinders the formation of the oxide film, and the complexation of Cl- to CuCl is the first-order reaction of Cl- concentration; H + is generated during the conversion of CuCl to Cu2O so that the vicinity of the electrode surface The pH value of the solution decreases, hinder the formation of oxide film and reduce the durability, and Na2B4O7-H3BO4 buffer system in the solution, can effectively improve the breakdown voltage of the oxide film. According to the mathematical model of the reaction process proposed in this paper, the results are in good agreement with the experimental results.