目的 开发一种能够在服役期内免维护或少维护的钢结构电弧喷涂合金线材。方法 通过二元相图以及探究试验确定新型Zn-Cu-Ti合金线材的最优配方，通过盐雾试验及电化学实验研究涂层的防腐性能。采用SEM观察金属涂层腐蚀前后的表面形貌，采用XRD谱图表征不同腐蚀状态下涂层表面的化学成分。结果 3.5%NaCl腐蚀溶液浸泡10 d后，涂层表面钝化，腐蚀溶液对涂层的影响趋于平稳。盐雾试验进行1080 h后，腐蚀速率开始下降，2160 h时腐蚀速率降到最低，为0.044 g/(m2?h)。新型Zn-Cu-Ti涂层的腐蚀电位较负，短时间内能发生氧化反应形成钝化膜并保护基体。被腐蚀涂层的X 射线衍射谱图显示，2θ为36.4o、39.1o、54.1o处均出现了Zn的氧化物，主要氧化物包括Zn(OH)2和Zn(OH)8Cl2?H2O，各元素峰强度随腐蚀时间的变长而逐渐减弱。结论 以新型Zn-Cu-Ti合金线材为原料的金属涂层的耐腐蚀性能优异。

The work aims to develop an electric arc spraying alloy wire of steel structure requiring no maintenance or less maintenance during service period. Optimum formula of the new Zn-Cu-Ti alloy wire was determined based upon binary phase diagram and exploratory experiment. Corrosion resistance of the coating was studied by performing salt spray test and electrochemical experiment. Surface morphology of the original and corroded metallic coating was observed with SEM. Chemical composition of the coating surfaces under different corrosion conditions was characterized with XRD. The coating surfaces were completely passivated after immersion in 3.5%NaCl corrosion solution for 10 days, and effects of corrosion solution on the coatings tended to be stable. Corrosion rate began to decrease as salt spray test lasted 1080 h, and reduced to the lowest rate, 0.044 g/(m2?h) at 2160 h. Due to negative corrosion potential of the new Zn-Cu-Ti coating, a passive film might take shape and protect the substrate as a result of oxidizing reaction in a short time. The XRD spectra of the corroded coating showed that Zn oxides were present at 2θ=36.4°, 39.1° and 54.1°. Main oxides included Zn(OH)2 and Zn(OH)8Cl2?H2O, and peak intensity of each element gradually decreased as corrosion time prolonged. The metallic coating made from new Zn-Cu-Ti alloy wire exhibits excellent corrosion resistance.