Effect of TiN/Ti multilayer coatings with different microstructure on corrosion and wear properties of high-strength steel

摘要

High-strength steel, which is widely used in aircraft bearing components, are challenged by corrosion and wear when exposed to the marine environments. In this work, the TiN/Ti multilayer coatings with two types of microstructures were prepared on the surface of 30CrMnSiA high -strength steel using arc -ion plating. The two coatings had the same modulation ratio (TiN and Ti = 9 : 1), thickness (17 μm), but different modulation periods of 3.5 μm (4 layers) and 1.2 μm (12 layers), respectively. The electrochemical results showed that the open circuit potentials of 4-layer and 12- layer coating were 147 mV and 255 mV higher than the substrate. The corrosion potentials and corrosion current densities of 4 layers and 12 layers were -0.52 V, 5.03 E-8 A/cm2 and -0.41 V,4.60 E-9 A/cm2, respectively. And the corrosion current density of 12 layers was 77.5% lower than that of the substrate. The wear results showed that the coefficient of friction (CoF) of 4 layers and 12 layers coatings were 0.55 and 0.49, respectively, with a reduction of 21.4% and 30% compared to the substrate. The wear results showed that the multilayer coatings obviously improved the anti-wear properties of steel. The thinner modulation period of the TiN/Ti multilayer coating could inhibit the penetration of corrosive media into high-strength steels and increase the toughness of the multilayer coatings, thereby improving the corrosion and wear resistance of the steel.