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Rem: Revista Escola de Minas

Print version ISSN 0370-4467On-line version ISSN 1807-0353

Abstract

SADE, Wagner; NEIVA, Everton G. de; NUNES, Rogério Antônio Xavier  and  BRANCO, José Roberto T.. Avaliação da adesão e da dureza ao risco pelo ensaio de riscamento de recobrimentos químicos de Ni-P. Rem: Rev. Esc. Minas [online]. 2006, vol.59, n.3, pp.341-345. ISSN 0370-4467.  https://doi.org/10.1590/S0370-44672006000300015.

Chemical coatings of Ni-P have been observed in various applications, such as, tools, molds and matrices, mainly to prevent wear and corrosion. In this present work, Ni-P coatings with 8 and 10%P were deposited on steel ABNT 1020 and heat-treated at temperatures between 300ºC and 650ºC for 1h. The microstructures, nickel and phosphates have been examined using a scanning electronic microscope (SEM). Analyses of Differential Scanning Calorimetry (DSC) has been carried out to detect reactions and transformations of the phases. The results of assay scratch revealed a variation of the adhesion of these coatings in function of the heat treatment temperature, as well as of the hardness to the scratch that reached a maximum value to 400ºC.

Keywords : Ni-P; adhesion; hardness to the scratch.

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