Materials and fabrication of tunable amorphous metallic coatings

6 Materials and fabrication of tunable amorphous metallic coatings 

High-velocity oxygen-fuel spray (HVOF), CS and PTS methods are possible deposition methods to apply such coatings. PTS utilizes high heating and laige 

2 Map of Al-Co-Ce alloy compositions that yield amorphous, amorphous/crystalline and crystalline nanostructures in the Al-Co-Ce alloy system based on the atomic % Co and Ce present in solid solution Al. The map shown was produced at a high cooling rate and results may differ at different cooling rates. The crystal structures were determined by both XRD and TEM analysis (based on original work by Gao et al., 2007). 

3 (a) XRD spectra of MSRs made from original (all particles less than 10 xm) and refined (particles between 0.5 and 10 im) feedstock powders, and of bulk materials, all target composition AlggCo Cej at%. (b) XRD spectra of an as-deposited PTS coating (composition AlggCo jCe at%) before and after heating at 275°C for 6 hours then 285°C for 3 hours (Tailleart etal., 2012). NACE International 2012. 

Coatings that act as barriers to corrosion are commonly used and date back to the use of noble metal decorative and corrosion resistant coatings (Cramer and Covino, 2005). However, as in the case of sacrificial cathodic protection, barrier properties are often fixed by rather inflexible alloy compositions and stractures. Porosity in coatings is often minimized by mediating coating thickness. 

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