The influence of ageing of epoxy coatings on adhesion of polyurethane topcoats and protective properties of coating systems |
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| Authors: | Ma&#x;gorzata Zubielewicz Agnieszka Krlikowska |
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| Affiliation: | aInstitute for Engineering of Polymer Materials and Dyes, Paint and Plastics Department, Chorzowska 50A, 44-100 Gliwice, Poland;bRoad and Bridge Research Institute, Warsaw, Poland |
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| Abstract: | The dependence of adhesion and protective properties of coating systems on surface properties of epoxy intermediate coatings, aged and non-aged before an application of polyurethane topcoats, were examined. The intermediate coatings were aged 500 h in UV chamber. The surface free energy and polar groups were estimated after ageing. After applying polyurethane topcoats on aged and non-aged epoxy coatings, resistance to salt spray and thermal shocks were tested as well as internal stresses were measured before and after corrosion tests.The results showed that adhesion in coating systems with polyurethane topcoats applied on aged epoxy coatings depends strongly on the degradation degree of epoxy intermediate coatings and the value of generated internal stresses. Coatings with good adhesion retention in corrosion environments have good protective properties even when temporary blistering has occurred. |
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| Keywords: | Epoxy coatings Polyurethane coatings Ageing of epoxy coatings Adhesion Corrosion protection |
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