Structure and corrosion resistance of CrTiN coating deposited by arc ion plating

doi:10.13251/j.issn.0254-6051.2021.08.042

Abstract

Abstract: Cr_xTi_1-xN coatings were deposited on H13 mould steel substrate by arc ion plating, and the influence of Cr/Ti atomic ratio on structure, mechanical properties and corrosion resistance of the as-deposited CrTiN coating was investigated. The results show that the CrTiN coating with different Cr/Ti atomic ratios is obtained by adjusting arc current. The CrTiN coating is composed of solid solution fcc-(Cr,Ti)N and CrN phases. With the increase of Cr/Ti atomic ratio from 1.1 to 1.8, the structure of the coating changes from a random orientation to (111) preferred growth. Microhardness of the CrTiN coating is improved as compared with CrN coating and has a maximum value with the change of lattice distortion caused by solid solution. According to electrochemical impedance spectroscopy and potentiometric polarization curve analysis, the dense Cr_0.59Ti_0.41N coating shows the best corrosion resistance when the Cr/Ti atomic ratio is 1.4.

Key words: arc ion plating, Cr/Ti atomic ratio, mechanical properties, corrosion resistance

CLC Number:

TB43

Wang Qishai, Zhang Lin, Li Borong, Zhang Baorong, Zhao Zhiyong. Structure and corrosion resistance of CrTiN coating deposited by arc ion plating[J]. Heat Treatment of Metals, 2021, 46(8): 219-224.

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