摘要：利用噴霧干燥法制備了不同Ni含量的團聚型Zn-Ni復合粉末，并在此基礎上用氧乙炔火焰噴涂工藝制備了Zn-Ni復合涂層。通過動電位極化和電化學阻抗測試，并結合SEM、EDS和XRD分析，研究涂層在海水介質中的防護性能和腐蝕機理。結果表明：涂層的自腐蝕電位穩定值在-0.98至-0.95 V，Ni可起到穩定Zn(OH)2，抑制其向疏松ZnO轉化的作用，腐蝕產物的堆積使得涂層電阻Rc和電荷轉移電阻Rt不斷增大，腐蝕電流不斷減小；不同Ni含量涂層的耐蝕性存在明顯差異，其中Ni含量為20 mass%的涂層耐蝕性能最好。

       Abstract：In order to improve the corrosion resistance of coating and prolong its life in the marine environment. Zn-Ni composite coatings including different nickel content were prepared by oxyacetylene flame spraying process, with Zn-Ni composite powders which were prepared by spray-dried process. The protection performance and corrosion mechanism of the Zn-Ni composite coatings in seawater were tested by means of potentiodynamic polarization and electrochemical impedance, and with the analysis of SEM, EDS and XRD. Results shown that the stable corrosive potential of the coatings finally ranges from -0.98 V to -0.95 V. The presence of nickel can play a role that restrain the dense Zn(OH)2 to be converted into the loose ZnO. At the same time, the coatings resistance Rc and charge transfer resistance Rt are both being increased and causing the coatings corrosion current being decreased gradually with the accumulation of corrosion products. Corrosion resistances of these coatings with different nickel content are obviously different, and the anti-corrosion properties of the coating with 20 mass% Ni is best.

       Key Word：oxyacetylene flame spraying,Zn-Ni composite coating,potentiodynamic polarization,electrochemical impedance,corrosion resistance