4.7 Article

Corrosion resistance mechanisms of detonation sprayed Fe-based amorphous coating on AZ31B magnesium alloy

期刊

JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 576, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jnoncrysol.2021.121276

关键词

Magnesium alloy; Fe-based amorphous coating; Detonation gun; Passivating film; Corrosion mechanism

资金

  1. National Natural Science Foundation of China [51901092, 52075234]
  2. program of Science and Technology International Cooperation Demonstrative Base of Metal Surface Engineering along the Silk Road [2017D01003]
  3. 111 project [D21032]
  4. Key Research Program of Education Department of Gansu Province [GSSYLXM-03]
  5. Natural Science Foundation of Gansu Province [20JR5RA431, 20JR10RA196]
  6. Hongliu Distinguished Young Talent Support Program of Lanzhou University of Technology
  7. Open Fund Project of Hunan Province Key Laboratory of Electromagnetic Equipment Design and Manufacturing, Hunan Institute of Technology [DC202001]

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The microstructure and corrosion mechanisms of detonation sprayed Fe-based amorphous coating on AZ31B magnesium alloy substrate were studied. The coating presented a typical amorphous structure and had a low porosity. Its excellent corrosion resistance was mainly attributed to its unique disordered structure, uniform chemical composition, and the formation of a uniform passive film on the surface.
The microstructure and corrosion mechanisms of the detonation sprayed Fe-based amorphous coating on AZ31B magnesium alloy substrate were studied in detail by potentiodynamic polarization tests in 3.5 wt.% NaCl solution. The results show that the coating presents a typical amorphous structure, a fairly low porosity of less than 1%. Benefit from these structural advantages, the corrosion current density and impedance modulus are about 1/20 and 70 times that of AZ31B, respectively, which shows excellent corrosion resistance and protection. This distinguished corrosion resistance is mainly attributed to its unique disordered structure, uniform chemical composition, and the formation of uniform passive film on the surface, which hinders the invasion of chloride ions and prevents the further occurrence of corrosion. In addition, the ultra-high density of detonation sprayed coating also further hinders the penetration of corrosive media such as chloride ions, and provides a good corrosion protection for AZ31B.

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