GROWTH STRUCTURE EFFECT ON THE CORROSION RESISTANCE AND MECHANICAL PROPERTIES OF CrNx COATING

Jiaojiao Du, Haibin Zhou, Caixia Sun (), Haijiang Kou (), Zhongwei Ma, Xiaoyan Wang and Jingjie Dai
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Jiaojiao Du: School of Mechanical Engineering, Yangzhou University, Yangzhou 225000, P. R. China
Haibin Zhou: #x2020;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, P. R. China‡Qingdao Center of Resource Chemistry and New Materials, Qingdao 266000, P. R. China
Caixia Sun: #xA7;Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, P. R. China
Haijiang Kou: #xA7;Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, P. R. China
Zhongwei Ma: #xA7;Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, P. R. China
Xiaoyan Wang: #xA7;Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, P. R. China
Jingjie Dai: #xA7;Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong, Qingdao Binhai University, Qingdao 266555, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 01, 1-10

Abstract: A new approach was adopted to improve the corrosion behavior of the chromium nitride (CrNx) hard coating through magnetron sputtering deposition at different nitrogen flow rates. The influence of the nitrogen flow rates on the chemical composition, microstructure, mechanical property and corrosion behavior in artificial seawater of the CrNx coatings was investigated. The results show that with the increase of the nitrogen flow rates, the growth structure of the coatings varied from dense granular growth to coarse columnar growth. Increasing the nitrogen flow rates was helpful to decrease the Cr/N ratio and induce the phase transforming from mixed hexagonal Cr2N and face-centered cubic CrN to single CrN. However, the coatings under different nitrogen flow rates significantly improved the corrosion resistance and hardness of the steel substrate. Furthermore, at high nitrogen flow rate, the coating had high corrosion velocity and low protective capability against the substrate corrosion due to the fast corrosion channels acted by the columnar grain boundaries. While at the middle nitrogen flow rate, the coating with CrN phase, densely granular growth structure and moderate grain size resulted in excellent corrosion resistance and highest hardness.

Keywords: CrNx coating; magnetron sputtering; growth structure; corrosion; hardness (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19500914

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