Effects of Annealing Below Glass Transition Temperature on the Wettability and Corrosion Performance of Fe-based Amorphous Coatings

This study investigated the effect of annealing below glass transition temperature (T-g) on the microstructural characteristics, mechanical property, wettability, and electrochemical performance of activated combustion-high velocity air fuel (ACHVAF)-sprayed Fe-Cr-Mo- W-C-B-Y amorphous coatings (ACs). Results showed that Fe-based ACs with a thickness of similar to 300 mu m exhibited a fully amorphous structure with low oxidization. Originating from the reduced free volume, sub-T-g annealing increased the thermal stability, hardness, and surface hydrophobicity of Fe-based ACs. The enhanced corrosion resistance of sub-T-g annealed ACs in 3.5 wt% NaCl solution was attributed to the increased surface hydrophobicity and passivation capability. This finding elucidates the correlation between sub-Tg annealing and the properties of Fe-based ACs, which promotes ameliorating ACs with superior performance.

Automated summary

The study demonstrates that sub-T-g annealing can improve the thermal stability, hardness, and corrosion resistance of Fe-based amorphous coatings, enhancing their performance in 3.5 wt% NaCl solution.