ÇEĞİL, Özkan Sakarya Üniversitesi - Fen Bilimleri Enstitüsü - Metal Eğitimi Bölümü, Turkey , ŞEN, Şaduman Sakarya Üniversitesi - Mühendislik Fakültesi - Metalurji ve Malzeme Mühendisliği Bölümü, Turkey

Corrosion Behavior of TiN Coated AISI D2 Steel

27654

In this study, the corrosion behaviors of nitride and titanium nitride (TiN) layers deposited on AISI D2 steel samples are reported. Steel was at first nitrided in a nitrogen and ammonia atmosphere at 575 °C for 8 h and then titanium nitride coating treatment was performed in the powder mixture consisting of ferro-titanium, ammonium chloride and alumina at 1000°C for 2h by pack diffusion coating. TiN coating layer thickness realized on the AISI D2 steel is 6,71 ± 0,9 μm. The hardness of TiN layers is 1450±30 HV0.005 which is much higher than that of the hardness of nitrided layers (920 ± 20 HV0,005) and substrates (550±14 HV0,005). Micro-structural investigation, phase analysis and corrosion tests were realized on the titanium nitride coated steel. The corrosion properties of uncoated and coated samples were characterized by potentiostatic polarization test. Nitrided and TiN coated steel specimens exhibited higher corrosion resistance than uncoated steel in 0.5M H2SO4 solution. Conclusively, the application of nitride and TiN films on AISI D2 steel increased surface hardness and corrosion resistance. TiN coating exhibits the highest corrosion resistance.

285

Coating , TiN , Corrosion , Pack diffusion

Afyon Kocatepe University Journal Of Science an‎d Engineering

289