Structural characterization of heat treated electroless Ni-P-Al2O3 coatings
Abstract
This paper presents the results from the study of the microstructural changes that occur in composite electroless nickel coatings on aluminium, without particles and with the addition of aluminum oxide particles, as they are deposited and after the application of heat treatment at 300°C and 400°C for one hour. The characterization of the coatings obtained was carried out by means of scanning electron microscopy, interferometric microscopy, microhardness, microanalysis and X-ray diffraction. After the heat treatment applied, the coatings undergo a structural change that takes them from an initial amorphous condition to a crystalline condition, accompanied by a precipitation hardening process that causes an increase in the microhardness of the coatings. It is also observed that the presence of aluminium oxide particles, in the proportion used, has no relevant effect on the structural transformations of the deposits, compared to the coating without particles
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Copyright (c) 2022 Arturo Barba Pingarron, Alba Covelo Villar, Miguel Ángel Hernández Gallegos, Gilberto Agredo Díaz; Raúl Valdéz Navarro; Rafael González Parra
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