熔盐电镀钽及其耐磨损烧蚀性能  

Wear and Erosion Resistance Properties of Electroplating Ta Coating in Molten Salt

作　　者：王升[1] 熊党生[1] 李建亮[1] 何勇[1] 

机构地区：[1]南京理工大学材料学院,南京210094

出　　处：《中国表面工程》2015年第2期101-107,共7页China Surface Engineering

基　　金：国家自然科学基金(51101087)

摘　　要：为提高火炮身管的磨损、腐蚀和烧蚀性能,在炮钢表面进行熔盐镀钽正交试验。采用极差分析法研究时间、温度、电流密度和镀件粗糙度对镀层厚度的影响,并对镀钽的工艺参数进行优化。利用硬度仪、X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)等分析技术对钽镀层硬度、物相、微观形貌以及化学成分进行了表征;模拟身管内磨损、烧蚀与腐蚀3种工况,分别利用高温摩擦磨损试验机(HT1000)、脉冲激光(YAG-M50)和综合电化学测试方法对钽镀层与铬镀层耐磨损性能、耐烧蚀性和耐腐蚀性能进行对比研究。结果表明:在750℃,0.08A/cm2时可获结晶度不高的硬钽镀层,退火后得到α相钽,硬度下降;表面耐磨性增加,摩擦因数与磨损量较铬镀层分别降低33.3%与55.6%;腐蚀电位相对于铬镀层正移了365mV,大幅提高了其耐蚀性能;脉冲激光测试结果也表明耐烧蚀性能有所提高。Tantalum （Ta） coating was electroplated from Fluoride for better coating of the barrel with orthonal test. The composition, microstructure and morphologies of the coating were analyzed by SEM, EDS, XRD and microhardness tester. Compared with chromium （Cr） coating, the wear resistance, ablation resistance and corrosion properties of Ta coatings on barrel surface were analyzed by high temperature friction wear tester （HT1000）, laser pulse （YAG-M50） and potentiodynamic polarization and electrochemical impedance spectroscopy （EIS）, respectively. The results show that the Ta coating has good properties when the temperature is 750 ~C. The sample is compact and uniform, and binds well with the substrate. Compared with those of the Cr coating, the friction coefficient and the wear volumes decrease by 33. 3% and 55.6%, respectively. The surface activity is reduced, and the corrosion potential shifts 365 mV than that of the Cr coating, which significantly enhances the corrosion properties. At the same time, the laser pulse analysis indicats that the ablative property is also better than the Cr coating.

关 键 词：熔盐镀钽 钽镀层 耐磨损 耐蚀性能 激光烧蚀 

分 类 号：TG174.441[金属学及工艺—金属表面处理]