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Comparison of different pretreatment‐primer systems on hot‐dip galvanized and Galfan coated steel

P. Puomi (P. Puomi is a Research Scientist in the Department of Physical Chemistry, Åbo Akademi University, Åbo, Finland.)
H.M. Fagerholm (H.M. Fagerholm is Project Manager and Assistant Professor, in the Department of Physical Chemistry, Åbo Akademi University, Åbo, Finland.)
J.B. Rosenholm (J.B. Rosenholm is Professor, in the Department of Physical Chemistry, Åbo Akademi University, Åbo, Finland.)
R. Sipilä (R. Sipilä is a Development Engineer at Rautaruukki Steel, Strip Products, Hämeenlinna, Finland)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 June 1999

924

Abstract

The performance of different pretreatment‐primer systems for hot‐dip galvanized (HDG) and Galfan coated steel has been studied. The materials were pretreated with three pretreatment processes; an alkaline oxide pretreatment with either a chromate or a zirconium based post‐rinse, and a zinc phosphating pretreatment. After the pretreatment, the panels were coated with four commercially available primers. The chemically treated substrates were characterized by using ESCA and GD‐OES, and the cured paint films by using FTIR. Paint adhesion of primed panels was determined with a combined cross‐cut and impact test and also with the NMP test. Formability of the panels was tested by T‐bend test and corrosion resistance with a cyclic prohesion test. According to the prohesion test results, primed Galfan coated panels have better edge corrosion resistance than primed HDG panels. Test results also show that the effect of pre‐treatment is not as significant for the corrosion resistance as the effect of primer. However, in the case of zinc phosphated samples, excellent synergistics between the pretreatment and two of the primers was detected.

Keywords

Citation

Puomi, P., Fagerholm, H.M., Rosenholm, J.B. and Sipilä, R. (1999), "Comparison of different pretreatment‐primer systems on hot‐dip galvanized and Galfan coated steel", Anti-Corrosion Methods and Materials, Vol. 46 No. 3, pp. 163-172. https://doi.org/10.1108/00035599910273115

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MCB UP Ltd

Copyright © 1999, MCB UP Limited

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