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采用火焰喷涂技术在铜基体表面先后喷涂渗铝层和陶瓷涂层,并加热保温,制备成铜基陶瓷/渗铝复合涂层。用XRD和SEM对涂层进行组织结构分析和形貌观察,并测试涂层的硬度、抗热震性和耐蚀性。结果表明,复合涂层中有Cu9Al4、Cu5Zn8、Cu3Ti等新相生成;渗铝层部分有γ2相(Cu9Al4)析出且涂层与基体结合紧密;复合涂层的硬度为82～87 HRE,其耐热震次数可达50次以上;复合涂层封孔后的耐酸蚀能力提高到基体的16倍,耐盐蚀能力提高到基体的25倍;极化试验表明,复合涂层抗电化学腐蚀能力显著增强,其耐蚀性能远优于纯铜渗铝层和单纯陶瓷涂层。
The flame spraying technique was used to spray the aluminized layer and the ceramic coating on the surface of the copper substrate and then heated and incubated to prepare the copper-based ceramic / aluminized composite coating. The microstructure and morphology of the coating were observed by XRD and SEM. The hardness, thermal shock resistance and corrosion resistance of the coating were tested. The results show that new phases of Cu9Al4, Cu5Zn8 and Cu3Ti are formed in the composite coatings. The γ2 phase (Cu9Al4) is precipitated in the aluminized coatings and the coating is tightly bonded to the substrate. The hardness of the coatings is 82-87 HRE, The number of thermal shock can reach more than 50 times; the acid corrosion resistance of the composite coating after sealing increases to 16 times that of the matrix, and the salt resistance corrosion resistance increases to 25 times of that of the matrix; the polarization test shows that the composite coating is resistant to electrochemical corrosion Significantly enhanced its corrosion resistance is far superior to pure copper aluminized layer and simple ceramic coating.