紧固件的机械能助渗锌–低铬达克罗复合防护技术  

Protection technology for fasteners by combination of mechanical energy-assisted sherardizing and low-chromium dacromet coating

作　　者：朱孝培 赵麦群[1] 高辉[1] 张金凤[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《电镀与涂饰》2017年第23期1260-1264,共5页Electroplating & Finishing

摘　　要：采用机械能助渗锌–低铬达克罗复合防护技术处理紧固件,采用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)等研究了复合涂层的微观组织结构,表征了它的结合强度和耐蚀性。达克罗涂层中Zn、Al主要以单质形式存在,Cr以非晶态形式存在。复合防护涂层呈层片状结构,能有效阻止腐蚀介质扩散;耐硝酸铵腐蚀时间可达7.8 h,结合强度为5级。The fasteners were treated via mechanical energy-assisted sherardizing followed by low-chromium dacromet coating. The microscopic structure of sherardizing–low chromium dacromet composite coating was studied using X-ray diffractometer(XRD), scanning electron microscope(SEM) and energy-dispersive spectrometer(EDS). Its adhesion and corrosion resistance were characterized. Zn and Al in dacromet coating are mainly existed as simple substances, while Cr is amorphous. The composite coating has a lamellar structure, which can effectively prevent the diffusion of corrosive medium in it. Its corrosion resistance time to ammonium nitrate is up to 7.8 h and its adhesion grade is 5.

关 键 词：紧固件 渗锌 达克罗涂层 微观结构 结合强度 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]