Abstract

Oxidation behaviour of low carbon and low alloyed steels at different Ni-Cr coatings thickness are studied, and also investigated the resistance offered by different coating thickness. Hardness of low alloy steel was increased from 202 to 342 VHN whereas that of mild steel was increased from 148 to 309 VHN after the application of coatings. Parabolic rate constant (Kp) for high temperature oxidation of bare, 200-250µm, and 250-300µm thick Ni-Cr coated low alloy steel were calculated to be 787.192, 0.235608, and 0.501787 (×10-10g2cm-4s-1) respectively, whereas that of mild steel were calculated to be 1104.49, 0.0309172, and 0.0978113 (×10-10 g2cm-4s-1) respectively.

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