NaCl-induced hot-corrosion behavior and mechanism of TiSiCN/Ag nanocomposite coatings by arc ion plating

TiSiCN/Ag nanocomposite coatings were deposited on the surface of titanium alloys by multi-arc ion plating. Under thermal-salt coupling, the coatings' hot corrosion behavior was studied. The corrosion resistance of titanium alloys can be greatly enhanced by the TiSiCN/Ag nanocomposite coatings. The reason is that the introduction of Ag can prevent the growth of columnar crystals and obtain a dense nanocomposite coating, thus reducing the invasion channels of Cl- and O2. Secondly, Ag can efficiently bind Cl- and prevent its diffusion, protecting the coating and titanium substrate from Cl- damage.