冷喷涂TC4合金涂层性能研究

冷喷涂技术由于处理温度低，在制备易氧化和热敏感材料方面有很大的优势，特别是制备钛合金涂层能保持钛不被氧化发蓝。不锈钢受氯离子影响在海洋环境中点蚀风险极大，影响了其在海洋环境的应用，钛合金涂层则可以有效的解决这个问题。本文采用冷喷涂方法在不同工艺参数下在304不锈钢表面制备了Ti-6Al-4V(TC4)合金涂层，利用微观方法观察了涂层的形貌、组织结构，并利用电化学方法研究了涂层的腐蚀电化学特征。研究结果表明，冷喷涂制备的TC4合金涂层表观形貌较为粗糙，且内部组织结构不够紧密，氧化程度没有明显增加，但是腐蚀电化学行为与TC4基体相当，是理想的表面处理技术，作为涂层材料可大大提升不锈钢在海洋环境下的耐点蚀性能，具有广阔的应用前景。

Study on Properties of Cold Sprayed TC4 Alloy Coating

Cold spraying technology has great advantages in preparing easily oxidizable and heat-sensitive materials due to the low processing temperature. Especially, the preparation of titanium alloy coating can keep titanium from being oxidized and bluish. The impact of chloride ions on the corrosion of stainless steel in the marine environment is extremely high, which affects its application in the marine environment. The titanium alloy coating can effectively solve this problem. In this paper, the TC4 alloy coating was prepared on the surface of 304 stainless steel by cold spraying under different process parameters. The morphology and microstructure of the coating were observed by microscopic methods, and the electrochemical characteristics of the coatings were studied by electrochemical methods. The research results show that the TC4 alloy coating prepared by cold spraying has a rough appearance, and the internal structure is not tight enough, and the degree of oxidation has not increased significantly. However, the corrosion electrochemical behavior is equivalent to that of the TC4 substrate. It is an ideal surface treatment technology. The coating material can greatly improve the pitting resistance of stainless steel in the marine environment, and has broad application prospects.