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Open AccessFeature PaperArticle

Study of Electroless Nickel Coatings on EN-GJS-500-7 Spheroidal Graphite Cast Iron

SIMaP, Université Grenoble Alpes, CNRS, Grenoble-INP, Grenoble 38000, France
Author to whom correspondence should be addressed.
Coatings 2018, 8(7), 239;
Received: 25 May 2018 / Revised: 17 June 2018 / Accepted: 4 July 2018 / Published: 6 July 2018
PDF [6563 KB, uploaded 6 July 2018]


EN-GJS-500-7 spheroidal graphite (SG) cast iron was coated with chemical Ni-P. The kinetic study reveals that the limiting step corresponds to a classical surface process, but the morphological study shows, at short times, an imperfect Ni-P coating on the graphite spheroids. The initial Ni-P growth appears to be blocked. This problem has been solved by the application of a cathodic polarization for a few minutes as a pretreatment of the surface. It was observed after this first step that both chemical and electrochemical reduction of nickel cation and hypophosphite on the SG cast iron took place at the same time, leading to the growth of a homogeneous Ni-P scale, in particular on graphite spheroids. View Full-Text
Keywords: covering coatings; electroless nickel; nickel-phosphorus covering coatings; electroless nickel; nickel-phosphorus

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Forestier, I.; Berthomé, G.; Wouters, Y. Study of Electroless Nickel Coatings on EN-GJS-500-7 Spheroidal Graphite Cast Iron. Coatings 2018, 8, 239.

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