Corrosion Behavior and Mechanism of Carbon Ion-Implanted Magnesium Alloy

Coatings

Banglong Yu¹  Jun Dai¹  Qingdong Ruan²  PaulK. Chu²  Zili Liu³ 

[1] Changshu Institute of Technology, School of Automotive Engineering, Changshu 215500, China;Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China;School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China;

关键词: magnesium alloy;    carbon nanolayer coating;    plasma ion implantation;    first-principle calculation;    corrosion resistance;   

DOI  :  10.3390/coatings10080734

来源: DOAJ

【 摘 要 】

Carbon ion implantation was conducted on an AM60 magnesium alloy with fluences between 1 × 10¹⁶ and 6 × 10¹⁶ ions/cm² and an energy of 35 keV. The microstructure and electrochemical properties of the samples were systematically characterized by X-ray photoelectron spectroscopy, X-ray diffraction, Raman scattering, scanning electron microscopy, transmission electron microscopy, and electrochemical methods. These studies reveal that a 250 nm-thick C-rich layer is formed on the surface and the Mg₂C₃ phase embeds in the ion-implanted region. The crystal structure of the Mg₂C₃ was constructed, and an electronic density map was calculated by density-functional theory calculation. The large peak in the density of states (DOS) shows two atomic p orbitals for Mg₂C₃. The main electron energy is concentrated between −50 and −40 eV, and the electron energy mainly comes from Mg (p) and Mg (s). The electrochemical experiments reveal that the E_corr is −1.35 V and I_corr is 20.1 μA/cm² for the sample implanted with the optimal fluence of 6 × 10¹⁶ ions/cm². The sample from C ion implantation gives rise to better corrosion resistance.

【 授权许可】

Unknown