Formation by reactive magnetron sputtering of TiN coating on Ti-implanted magnesium alloy

Reactive magnetron sputtering method was used to deposit TiN coating on Ti-implanted magnesium alloy. FESEM, GIXRD and AES were used to investigate this surface system's micro-morphology, crystalline structure and chemical composition, respectively. It showed that TiN coating took on a compact surface morphology and existed as a columnar crystalline structure. The results of the electrochemical test and immersion test showed that the corrosion resistance of AZ31 was greatly improved in 3.5 wt.% NaCl solution by this kind of surface treatment technique. It was mainly due to the combined effect of the dense TiN coating, the Ti-implanted layer and the good adhesion between coating and substrate.