304不锈钢表面冷喷涂TC4钛合金涂层性能研究

Research on Cold Sprayed TC4 Titanium Alloy Coating on 304 Stainless Steel

摘要:

采用冷喷涂技术在304不锈钢表面制备了TC4钛合金涂层,通过扫描电子显微镜观察了涂层的形貌、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钛合金涂层致密性存在较为明显的梯度现象,靠近基体的涂层密度明显高于表面;涂层喷涂过程没有出现明显氧化现象,与基体的结合强度可达20 MPa左右;涂层的耐腐蚀性能优于304不锈钢,可大大提升不锈钢材料在海洋环境中的耐点蚀性能。

Abstract:

The TC4 titanium alloy coating was prepared on the surface of 304 stainless steel by cold spray technology.The morphology and structure of the coating were observed by scanning electron microscope. The electrochemical characteristics of the coating were studied by electrochemical methods. The results show that the density of TC4 alloy coating prepared by cold spray has obvious gradient,the density of the coating near the substrate is significantly higher than the surface; the coating spraying process does not produce significant oxidation,and the bonding strength with the substrate can reach about 20 MPa; the corrosion resistance of the coating is better than 304 stainless steel,which can greatly improve the corrosion resistance of stainless steel materials in the marine environment.