Effect of single Si1−xCx coating and compound coatings on the thermal conductivity and corrosion resistance of Mg–3Sn alloy

Abstract

A single Si1−xCx coating and compound coatings were deposited on Mg–3Sn matrix alloy by magnetron sputtering method. Compound coatings included Mg or Mg/AlTi intermediates between Mg–3Sn substrate and Si1−xCx coating. The thermal conductivity of the Mg–3Sn alloy after coating was enhanced at room temperature. The results showed that the Mg–3Sn alloy coated with Mg/AlTi/Si1−xCx displayed higher thermal conductivity, its thermal conductivity after corrosion was 90.1 W/(m K) and 108.4 W/(m K) at 25 °C and 100 °C, respectively. Meanwhile, it was revealed that the Mg/Si1−xCx and Mg/AlTi/Si1−xCx compound coatings had nobler Ecorr and much lower icorr, higher Rp, compared with the bare Mg–3Sn and Mg–3Sn/Si1−xCx system, and improved the corrosion resistance of the magnesium substrate.

Keywords

• Si1−xCx coating
• Compound coatings
• Thermal conductivity
• Corrosion resistance