Study on Corrosion Resistance of Ta Alloyed Layer on Pure Tungsten Surface by Plasma

Ta alloying modified layer was prepared on pure tungsten surface by double glow plasma surface alloying technology to improve the corrosion resistance of the material.The effects of different temperature process parameters on the microstructure and corrosion resistance of Ta alloyed layers were studied.The results show that continuous dense Ta alloying modified layer is prepared under different temperature and process parameters. The surface thickness of the alloyed layer improves with the increase of temperature.The alloy layer is mainly composed of pure Ta phase.The self-corrosion potential of Ta alloy layer is higher than that of the substrate, while the self-corrosion current density is lower, which mean that the electrochemical corrosion reaction is more difficult and the corrosion rate is lower in Ta alloyed layer.The corrosion resistance of the alloyed layer at 900℃is best, the corrosion rate reduces to 8.45×10^-3 g·m^-2·h^-1, showing excellent corrosion resistance.