The High-Temperature Oxidation Behavior of the Fe-Ni Based Alloy Coating Produced by Plasma Cladding

摘要

In the paper the efficient and low-cost plasma cladding technique has been used to prepare Fe-Ni based alloy coatings on the surface of low carbon steel. The high-temperature isothermal oxidation behavior of the specimens has been tested at 700°C and 800°C in air using an electrical furnace for 100 h. The elements distribution, phase composition, and morphology of the alloy coatings after the oxidation test have been characterized by SEM/EDS and XRD. Isothermal oxidation test show that the Fe-Ni based alloy coating has excellent high temperature oxidation resistance at 700°C and 800°C. The oxidation rate of Fe-Ni based coating at 800°C is higher than that of at 700°C. At 800°C, the oxidation kinetics basically follows the parabolic rate law before 80 h. A protective Fe_(0.99)Fe_(1.97)Cr_(0.03)Ni_(0.01)O_4 and Cr_(1.3)Fe_(0.7)O_3 based oxide film has been formed on the surface of the coating after oxidation.