Effects of yttrium on the oxidation behavior of 304 stainless steel with coating by laser remelting in high temperature water

Abstract

Effects of Y 2 O 3 on the oxidation behavior of 304 SS with coating by laser remelting after exposed to 290°C water containing 3 ppm O 2 for 72 h were investigated. It was found that the corrosion behavior of remelted layer on 304 SS with the addition of Y 2 O 3 was completely different from that of 304 SS and remelted layer on 304 SS without the addition of Y 2 O 3 . More Cr 2 O 3 hematite oxides were formed around strengthening phase near the Y 2 O 3 particles. With increasing exposure time, a little number of Fe 3 O 4 spinel oxides were continuing formed on the surface outside the Mn/Si enrichment area. The growth of Fe 3 O 4 spinel oxides were hindered because of the massive Cr 2 O 3 hematite oxides around the Y 2 O 3 particles. Some small Fe 3 O 4 spinel oxides were formed. Finally, the types of oxide film formed on the surface of the remelted layer with the addition of Y 2 O 3 were mainly Cr 2 O 3 hematite oxides and a few of fine FeCr 2 O 4 spinel oxides. The addition of Y 2 O 3 in laser remelting layer can obviously change the corrosion behavior of 304 SS exposed to high temperature water and the related mechanisms are also discussed.

Effect of laser remelting treatment on Al85Ni8Y4Ce3 amorphous coating

“…In addition, laser remelting is widely used to prepare amorphous coatings with compact structure and excellent properties. The formation of the molten pool during the remelting process is conducive to the mutual diffusion between the coating and the substrate, forming a metallurgical bond, which can greatly reduce the porosity of the coating and further improve the properties of the amorphous coating [19,20]. Al-based amorphous alloy coating has a potential market prospect in the field of surface coating because of its low cost and excellent wear and corrosion resistance.…”