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Active mechanical components that work in highly aggressive environments require protection against premature deterioration and, at the same time, it is necessary to ensure a long lifespan. In order to achieve these important features, a protective coating can be added. In this work, a NiCrBSi self-fluxing alloy powder was employed, as feedstock material. The coating was deposited by means of oxyacetylene flame spraying process, achieving a thickness of approximately 1000 mu m and exhibiting a high degree of porosity and a weak mechanical adhesion to the substrate. To improve these characteristics, a remelting process using high frequency currents was applied. After the remelting process, the porosity decreased, from an initial value of approximately 15%, to a final value under 3%. Although the microhardness values did not change significantly, both wear-rate and corrosion behavior improvement, after the electromagnetic remelting, was observed.

Characteristics of Thermally Sprayed Nicrbsi Coatings before and after Electromagnetic Induction Remelting Process