Interfacial characteristic and microstructure of Fe-based amorphous coating on magnesium alloy

Due to the susceptibility to corrosive environment, it is necessary for the surface protection of magnesium alloy. Fe-based amorphous coatings are deposited on the surface of WE43 magnesium alloy with a Ni60 interlayer which is fabricated by the high velocity oxy-fuel (HVOF) spraying. The interfacial characteristic, microstructure and properties as bonding strength, wearing and corrosion resistance of the amorphous coating are investigated. The results indicate that the Fe-based amorphous coating with high amorphous content and low porosity is attained on WE43 magnesium alloy, and a metallurgical bonding between the lamellar structures is identified by transmission electron microscopy (TEM). The bonding strength between amorphous coating and magnesium substrate exceeds 56 MPa. Comprehensive corrosion resistance of coatings is superior than stainless steel in 0.1 mol/L HC1 solution. The coefficient of friction is only half of that WE43 magnesium alloy. Therefore, the Fe-based amorphous coating shows a potential application for surface protection of magnesium alloy in chloride environment.

Automated summary

The study found that by depositing a high amorphous content and low porosity Fe-based amorphous coating on the surface of WE43 magnesium alloy, excellent corrosion resistance and bonding strength are achieved, showing potential application in chloride environments.