Abstract
Ceramic oxide powders like alumina and chromia were sprayed on mild steel substrate using flame spraying process. These coatings were remelted using a 2 kW fiber laser. Inherent lamellar structure of the thermal sprayed coatings was found to be obliterated after laser remelting. Columnar grains were found to grow perpendicular to the coating surface upon laser remelting. A reduction in surface roughness of the coatings was found after laser remelting. Mechanical properties like microhardness, Modulus of elasticity of the laser treated layer was found to be higher as compared to the as-sprayed coating. Corrosion resistance of both laser treated and non-treated coating was investigated using boiling H2SO4 solution. Laser treated coating performs better as compared to flame sprayed coating owing to dense coating morphology.
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