Suitable Pre-Treatment of Hot-Dip Zinc to Increase the Adhesion of Organic Coatings

Abstract

The article describes the possibilities of pre-treatment of hot-dip galvanized parts and their influence on the adhesion of organic coating. The main objective of this work was to compare the current possibilities of pre-treatment of hot-dip galvanized parts, this means phosphating, chromating and mechanical pre-treatment by light blasting and compare these technologies with today's alternative pre-treatment technologies based on chemical substances containing fluorozirconates. The basic function of these pre-treatments is to increase the adhesion of the organic coatings and to increase the lifetime of the entire corrosion protection. Another objective is to reduce the environmental impact of these pre-treatments, reduce energy for the technological process of pre-treatment and many other aspects. Last but no least to compare the different types of organic coating systems with using these pre-treatments on the hot-dip galvanized surface.