J. Mater. Sci. Technol. ›› 2020, Vol. 49: 224-235.DOI: 10.1016/j.jmst.2020.01.046

• Research Article • Previous Articles     Next Articles

Corrosion resistance of an amino acid-bioinspired calcium phosphate coating on magnesium alloy AZ31

Xiao-Li Fana, Chang-Yang Lia, Yu-Bo Wanga, Yuan-Fang Huoa, Shuo-Qi Lia, Rong-Chang Zenga,b,*()   

  1. a Corrosion Laboratory for Light Metals, College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    b School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China
  • Received:2019-10-08 Revised:2020-01-04 Accepted:2020-01-13 Published:2020-07-15 Online:2020-07-17
  • Contact: Rong-Chang Zeng

Abstract:

An l-cysteine-bioinspired calcium phosphate (Ca-P) coating is prepared upon magnesium alloy AZ31 in a water bath at 60 °C. FE-SEM, FTIR, XRD, electrochemical characterization, hydrogen evolution tests and XPS were used to evaluate the microstructure, chemistry and corrosion performance of the samples. Results indicate that l-cysteine promotes the nucleation process of the coating and significantly increases its thickness. This can be attributed to the complexation of the carboxyl group and mercapto group of l-cysteine with calcium ions. Indeed, the obtained Ca-P coating possesses higher corrosion resistance than that prepared in l-cysteine-free bath.

Key words: Magnesium alloys, Phosphate, Coating, Corrosion resistance, Amino acid