Structure and Properties of Rare Earth Praseodymium Coating on the Surface of AZ31B Magnesium Alloy

Xingxing Peng

doi:10.6919/ICJE.202505_11(5).0014

Authors

Xingxing Peng

DOI:

https://doi.org/10.6919/ICJE.202505_11(5).0014

Keywords:

Praseodymium Nitrate; Potassium Ferricyanide; Corrosion Resistance; Electrochemical Testing.

Abstract

The poor corrosion resistance of magnesium alloys severely limits the industrial application of magnesium alloys in aerospace as well as automotive applications.Therefore, rare earth coatings were prepared on the surface of magnesium alloys by using a mixture of praseodymium nitrate and potassium ferrocyanide in different concentrations in this study. This impregnation method is simple and green. Considering that without destroying the rare earth coating, in order to enhance the bonding force of the rare earth coating as well as the corrosion resistance, potassium ferrocyanide was taken in this study to pretreat the magnesium alloy first in order to facilitate the obtaining of a better rare earth coating. Scanning electron microscope (SEM) and atomic force microscope (AFM) methods were used to characterize the microscopic morphology of the coatings; Raman and X-ray diffraction (XRD) methods were used to determine the composition and structure of the coatings, electrochemical tests were used to test the corrosion resistance of the coatings. The results show that the pretreatment can enhance the adhesion and hydrophobicity of the coatings. The corrosion resistance of the coating can be controlled by changing the content of rare earth praseodymium and potassium ferricyanide. In this experiment, the optimum process parameters for the composite coating on the surface of AZ31B magnesium alloy were as follows: after pretreatment, the concentration of praseodymium nitrate solution was 0.1 mol/L and the concentration of potassium ferrocyanide was 0.1 mol/L. The processing time was 15 min, and its main compositions were O, Pr, Mg, Fe and P.

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