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

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 ℃.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.