冷喷涂Ni/Al2O3复合涂层在海洋大气环境下的腐蚀行为研究

目的 研究海洋大气环境对冷喷涂Ni/Al2O3复合涂层腐蚀损伤行为的影响,为提高合金钢的耐腐蚀性能提供依据.方法 采用冷喷涂技术在合金钢30CrMnSi表面制备Ni/Al2O3复合涂层,在万宁近海岸户外和海洋平台分别暴露6个月后,采用扫描电镜、电化学工作站等分析检测技术,研究Ni/Al2O3复合涂层在万宁海洋大气环境下...

Corrosion Behavior of Cold Sprayed Ni/Al2O3 Coating in Marine Atmosphere Environment

To provide a basis for improving the corrosion resistance of alloy steel, the effect of marine atmosphere environment on the corrosion damage behavior of cold sprayed Ni/Al2O3 composite coatings was studied. Cold spray technology was used to fabricate Ni/Al2O3 coating on the surface of alloy steel 30CrMnSi. After 6 months of exposure in Wanning offshore and offshore platforms, scanning electron microscope, electrochemical workstation and other analysis techniques was used to investigate corrosion behavior of Ni/Al2O3 composite coatings. After 6 months of outdoor exposure near the coast, the surface of the sample was evenly covered with salt, and light reddish-brown corrosion rust appeared in some areas. After 6 months of exposure to the offshore platform, the surface was unevenly covered with salt, and no overlapping characteristics of the sprayed coating were observed, and the coating surface was powdered. Results indicated that after 6 months of outdoor exposure near the coast of Wanning, the cold sprayed Ni/Al2O3 coating only corroded slightly on the surface, the main structure was relatively complete, and it could still effectively protect the substrate from corrosion. And after 6 months of exposure to the offshore platform, a large number of Al2O3 particles peeled off and the corrosive medium further spread, and cracks appeared in the coating, which greatly accelerated the corrosion of the coating.