Micro arc oxidation and electrophoretic deposition effect on damping and sound transmission characteristics of AZ31B magnesium alloy

Abstract

Micro arc oxidation (MAO) and electrophoretic deposition (EPD) process are employed to fabricate a dense coating on magnesium alloy to protect it from corrosion in engineering application. The EPD film changes the damping characteristic of magnesium alloy, and both the MAO and EPD process change the bending stiffness of samples being treated. Damping loss factor (DLF) test and sound transmission experiments were carried out for AZ31B magnesium alloy with coating fabricated by MAO and EPD processes. The results indicate that DLF is improved in frequency range from 0–850 Hz. Bending stiffness of the samples is improved with MAO and EPD treatment. As a result, the sound transmission loss (L_ST) is improved in the stiffness control stage of the sound transmission verse frequency curve. To the samples by electrophoresis process, the L_ST is improved in frequency range from 2500–3200 Hz, because the damping loss factor is improved with EPD process. The results are useful for the surface treatment to enhance the damping loss factor, L_ST and widespread application of magnesium alloy while improving the corrosion resistance.

Keywords

magnesium alloy / micro arc oxidation / electrophoretic deposition / damping loss factor / sound transmission loss / bending stiffness

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