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Structure and Anticorrosion, Friction, and Wear Characteristics of Pure Diamond-Like Carbon (DLC), Cr-DLC, and Cr-H-DLC Films on AZ91D Mg Alloy

  • Xue-Jun CuiEmail author
  • Chuang-Ming Ning
  • Lun-Lin Shang
  • Guang-An Zhang
  • Xiao-Qiang Liu
Article
  • 19 Downloads

Abstract

This study evaluated the protection against corrosion and wear afforded to AZ91D Mg alloy by coatings of hydrogen-free and low-Cr-doped hydrogenated diamond-like carbon (DLC) films. The microstructure and corrosion resistance were evaluated using scanning electron microscopy, atomic force microscopy, Raman spectroscopy, polarization curves, and neutral salt spraying tests. Wear tests were performed to investigate the friction and wear behaviors of the samples against 9Cr18 in humid air, deionized water, and 3.5 wt.% NaCl solution using a reciprocating sliding test in the ball-on-disk mode. The results showed that the more compact Cr-H-DLC film improved the corrosion resistance of the Mg alloy, whereas the Cr-DLC film accelerated the corrosion in the 3.5 wt.% NaCl solution. All Mg alloy samples coated with DLC films exhibited low coefficient of friction (COF) values and smaller wear volumes compared with those of bare substrate in air, water, or NaCl solution. The Cr-DLC film presented the lowest COF and wear rate in air, but the worst corrosion protection in air and NaCl solution, whereas the converse was found for the Cr-H-DLC film. Unfortunately, all coated samples showed limited protection ability because of pore defects in the films, high galvanic potential between the substrate and the buffer layer or film, and high electrical conductivity, which caused severe tribocorrosion of the Mg alloy during the wear tests in NaCl solution. The corrosion protection ability of DLC films is key to the wear resistance protection of Mg alloys in water or NaCl solution.

Keywords

chromium corrosion resistance diamond-like carbon friction and wear hydrogen-free magnesium alloys 

Notes

Acknowledgment

This work was supported by the Science and Technology Planning Project of Sichuan Province (2016JZ0032), the Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (2018Z01), and the National Natural Science Foundation of China (51865017). The authors thank Lin-Chuan Gu and Yong-Sheng Jiang for their assistance in the experiments.

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringSichuan University of Science and EngineeringZigongChina
  2. 2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouChina
  3. 3.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina

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