The surface modification of Ti6Al4V alloy using a TIG re-melting process with a non-consumable electrode under Ar and Ar + N2 shielding gases has been investigated. The re-melted layers were characterized using optical and scanning electron microscopy and x-ray diffraction. The corrosion behavior of samples was also examined by potentiostat analysis. Based on the results, the TIG surface re-melting process of Ti6Al4V alloy under Ar shielding gas has negative effects on hardness and corrosion behavior of coatings. In contrast, Ti6Al4V/TiN composite coatings were successfully formed during TIG re-melting process in the presence of N2 in shielding gas. The prepared coatings showed the hardness value of about 890-910 Hv which was over four times higher than the substrate (220 Hv). The hardness showed an increasing tendency by increasing the TIG current up to 115 A. By annealing the produced coatings, the metastable TiN phase was transformed into a stable Ti2AlN phase, and the hardness value increased to about 980 Hv. Moreover, the corrosion resistance of re-melted coatings was improved during the annealing process.