摘要
目的 通过冷喷涂技术在铜基体上制备了具有高致密高硬度的Cu/AlN涂层,并研究化学镀预处理工艺对冷喷涂Cu/AlN复合涂层微观形貌、力学性能和耐腐蚀性能的影响。方法 采用冷喷涂技术在铜基体表面分别沉积Cu、Cu-AlN(球磨混合)和Cu-Cu@AlN(化学镀包覆)涂层,通过扫描电子显微镜(SEM)观察了涂层截面的微观形貌,通过能谱仪(EDS)对涂层元素组成进行了检测,并计算了涂层中AlN的沉积量。借助维氏硬度计和电化学工作站分别对涂层进行了显微硬度和电化学腐蚀行为测试。结果扫描电镜结果显示,Cu-Cu@AlN和Cu-AlN涂层有着比纯Cu涂层更加致密的微观组织,并且与基体的结合更好,孔隙更少。能谱仪结果显示AlN在涂层中分布均匀,并且Cu-Cu@AlN涂层中AlN的含量明显大于Cu-AlN涂层。Cu-Cu@AlN涂层具有最高的显微硬度(151.8HV),相比基体提升71%。在模拟海洋环境中的电化学测试结果表明,Cu-Cu@AlN涂层的自腐蚀电位最高(-0.1667V),表明其腐蚀倾向最低,自腐蚀电流密度最低(1.18μA/cm^(2)),相比Cu-AlN涂层降低了1个数量级,表明其具有最佳的耐腐蚀性能。电化学阻抗谱(EIS)测试结果表明,Cu-Cu@AlN涂层具有最高的电荷转移电阻(1625?·cm^(2)),证实其具有最佳的耐蚀性,这与动电位极化测试的结果一致。结论 通过化学镀预处理的粉体制备出的Cu-Cu@AlN涂层致密,AlN含量高,该涂层的显微硬度和耐腐蚀性能最好,有望应用在铜及铜合金制备的船舶构件,从而延长其在海洋环境中的服役寿命。
The deposition temperature of cold spray is relatively lower than that of thermal spray,thus the coatings prepared by cold spray technology can effectively avoid coating oxidation and thermal stress damage of substrate.Cold spray technology is a kind of solid deposition technology of materials which has developed rapidly in recent years.The work aims to prepare Cu/AlN coatings with high density and high hardness on Cu substrate by adding AlN ceramic particles and study the effects of different feedstock powder pretreatment processes on the microstructure and properties of cold sprayed Cu/AlN composite coatings.100 mm×100 mm×3 mm Cu substrate was taken as the base material.Cu powder and AlN powder were used as raw materials.Cu-AlN mixed powder and Cu-Cu@AlN mixed powder were prepared by ball milling process and electroless plating process as spraying materials,respectively.During the cold spray process,N2(3.5 MPa,600℃)was used as the carrier gas,and the distance between the spray gun nozzle and the substrate was 30 mm.The microstructure and porosity of the coating section was analyzed by scanning electron microscope(SEM).The composition of coating elements was characterized by energy dispersive spectrometry(EDS),and the amount of AlN deposited in coating was calculated.The microhardness and electrochemical corrosion properties of the coating were measured by Vickers hardness tester and electrochemical workstation.The effects of different pretreatment processes(ball milling and electroless plating)on the microstructure,mechanical properties and corrosion resistance of the coatings were studied.The SEM results showed that Cu-Cu@AlN and Cu-AlN coatings had denser microstructure,fewer pores and better bonding with substrate than pure Cu coating.The deformation of Cu particles was strong,while the deformation of AlN particles was not due to the high hardness and low ductility.The EDS results showed that AlN was uniformly distributed in the coating,and the content of AlN in Cu-Cu@AlN coating was significantly higher
作者
周胜
王金芳
张孟
杨淑娟
唐宁
邵玲
陆青松
戴晟
张勇
ZHOU Sheng;WANG Jinfang;ZHANG Meng;YANG Shujuan;TANG Ning;SHAO Ling;LU Qingsong;DAI Sheng;ZHANG Yong(College of Textile Science and Engineering,Zhejiang Sci-tech University,Hangzhou 310018,China;Zhejiang Provincial Key Laboratory for Cutting Tools,Taizhou University,Zhejiang Taizhou 318000,China;School of Materials Science and Engineering,Taizhou University,Zhejiang Taizhou 318000,China;Zhejiang YINLUN Machinery Company Limited,Zhejiang Taizhou 317200,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第22期72-81,共10页
Surface Technology
基金
国家自然科学基金(52201187)
浙江省重点研发项目(2023C01082)
台州市农业与科技重点研发项目(NYJBGS202201)。
关键词
冷喷涂
化学镀
铜基涂层
ALN
微观形貌
耐腐蚀性能
cold spray
electroless plating
Cu-based coating
AlN
microstructure
corrosion resistance
