Hot salt corrosion behavior of TiAlN/Cr、TiAlN/CrN and TiAlN/CrAlN multilayer coatings

Abstract

Abstract: The hot salt corrosion of titanium alloys has attracted extensive attention. Metal nitride protective coating is an effective way to extend the service life of titanium alloys. In this study, the TiAlN/Cr coating, TiAlN/CrN coating, TiAlN/CrAlN-5 coating and TiAlN/CrAlN-10 coating were deposited on titanium alloy surface by Multi-arc Ion Plating technology. The differences in hot salt corrosion behavior of four kinds of multilayer coatings were compared by Scanning Electron Microscope (SEM), Energy Dispersion analyzer (EDS), X-ray diffractometer (XRD), Scratch tester and 3D Laser Microscope. Meanwhile, the microstructure and phase composition of the coatings were analyzed before and after hot salt corrosion. The results indicated that the addition of Al element and the optimization of modulation period can improve the surface quality of the coating. Among them, TiAlN/CrAlN-10 multilayer coating shows excellent heat resistance to salt corrosion due to its high interface density.

Key words: hot salt corrosion, TiAlN/CrAlN coating, interface density, corrosion resistance

CLC Number:

TG174.4

HE Ze-nian, WANG Shun-hua, PU Ji-bin. Hot salt corrosion behavior of TiAlN/Cr、TiAlN/CrN and TiAlN/CrAlN multilayer coatings[J]. Journal of Lanzhou University of Technology, 2023, 49(4): 1-10.

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