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Adherence of coatings: determination - problems - examples

Alexis, Joël and Etcheverry, Bernard Adherence of coatings: determination - problems - examples. (2007) In: 21st international conference on surface modification technologies, 24 September 2007 - 26 September 2007 (Paris, France).

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Abstract

There exist more and more multi-layer coatings worked out to meet multipurpose needs. The reliability of each interface between the layers must be studied. So that the coatings can fulfil their roles (corrosion, esthetics, wear, optics….). The optimization of adherence is thus a crucial stake for the industry of the surface treatments. However, the experimental determination of the layer’s adhesion is still badly controlled. Indeed, many questions remain. First, all the authors do not grant the same direction under the terms “adhesion” and “adherence”. Moreover, a multitude of experimental tests make their choice difficult. Some are qualitative, other are quantitative ones… Moreover, each test comprises experimental parameters which can influence the results. It seems difficult to compare the results for the same coating. Finally, the results of adherence are significant only if the interface between two layers or a layer and the substrate are requested. Consequently, a fractographic and physico-chemical study postmortem prove to be necessary in many cases to check the localization of the rupture. The presented work concerns the study of the adherence of “thick” electrolytic coatings of Zn-Ni and NiP on aluminium and steel substrates. These coatings are developed to replace coatings implementing carcinogenic baths containing of hexavalent chromium. Those seem moreover representative of the electrolytic coatings in general. Because their thicknesses, their mechanical properties and their adherence vary in a broad range. The influential parameters of the three tests used (scratch test, bending test and tensile test) are presented. The limits and the potentialities of each test will be highlighted.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Deposited By: Joël ALEXIS
Deposited On:16 Jan 2014 15:09

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