Hot corrosion of a novel NiO/NiFe2O4 composite coating thermally converted from the electroplated Ni-Fe alloy

摘要

A novel NiO/NiFe2O4 composite coating thermally converted from an electroplated Ni-Fe alloy was suc cessfully fabricated. The composite coating consisted of a NiO matrix and homogeneously distributed criss-cross intragranular and intergranular NiFe2O4 precipitates, with a very dense and flat structure. The composite, compared to bare Ni metal, exhibited increased hot corrosion resistance under an atmo sphere of Na3AlF6-AlF3-CaF molten salts and air at 960 °C, mainly because of the dense structure and well-adhered, homogeneously dispersed intragranular and intergranular NiFe2O4 precipitates.