Attain insensitivity to chlorine ions in magnesium alloys by impeding the diffusion process
Yuyang Chen, Guodong Fan, Xinchen Xu, Yiwen Chen, Tao Ying, Yangxin Li, Hong Zhu, Wanting Sun, Yang Gao, Zongyang Yang, Weiwei Song, Xiaoqin Zeng
Abstract
Abstract To serve in a more aggressive chlorine (Cl − ) ions-containing environment, a chlorine ions insensitivity Mg-Nd-Zr alloys is fabricated, exhibiting a stable corrosion resistance in either 3.5wt.% or 10 wt.% NaCl solution. Unlike pure Mg who exhibit a negligible protection of the matrix, a distinct “hindering effect” of Cl − diffusion caused by doping elements within the corrosion film was observed. Its underlying mechanism is demonstrated by X-ray photoelectron spectroscopy (XPS) and Density functional theory (DFT) analysis. The introducing with Nd and Zr elements can effectively passivate vacancies and alter diffusion energy of chlorine ions.