J. Mater. Sci. Technol. ›› 2020, Vol. 59: 117-128.DOI: 10.1016/j.jmst.2020.04.041

• Research Article • Previous Articles     Next Articles

Electrochemical characterization and microstructure of cold sprayed AA5083/Al2O3 composite coatings

Xiawei Yanga, Wenya Lia,*(), Siqi Yua, Yaxin Xua, Kaiwei Hua, Yaobang Zhaob   

  1. a State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, China
    b Shanghai Aerospace Precision Machinery Research Institute, Shanghai 201600, China
  • Received:2020-01-22 Revised:2020-03-31 Accepted:2020-04-19 Published:2020-12-15 Online:2020-12-18
  • Contact: Wenya Li

Abstract:

This work focused on the role of Al2O3 particles in the corrosion behavior of cold sprayed AA5083 aluminum alloy matrix composite (Al-MMC) coatings. The electrochemical characterization of the coatings was investigated in a 3.5 wt.% NaCl solution as a function of time. The results show that fragmentation of Al2O3 particles is not clearly observed in the case of AA5083/20 vol.% Al2O3 coating, while the broken Al2O3 particles can be seen clearly in AA5083/40 vol.% Al2O3 and AA5083/60 vol.% Al2O3 coatings. The addition of 20 vol.% Al2O3 particles yield the coating with the lowest porosity, and different volume fractions of Al2O3 in the feedstock have important effects on the electrochemical behavior of composite coatings. The Al-MMC coating reinforced with 20 vol.% Al2O3 particles exhibits the highest Ecorr and the lowest icorr compared with the other conditions. The order of current density is as follows: AA5083/20 vol.% Al2O3 < AA5083 < AA5083/40 vol.% Al2O3 < AA5083/60 vol.% Al2O3.

Key words: Cold spray, Aluminum alloy, Alumina particlesComposite coating, Electrochemical characterization