Article | REF: M1506 V1

Protection and decoration through paint - Anti-corrosion paints

Author: Jean-Claude LAOUT

Publication date: December 10, 2009

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ABSTRACT

This article reviews the main properties of anti-corrosion paint films: the air drying paints (such as alkyd, vinylic and silicon paints) and oven drying paints. The specificity of the various air drying paints is that, contrarily to oven drying paints they do not require any energy intake in order to form the protective film. The oven drying paints, be they liquid or powder, are more easily preserved. Furthermore, they allow for the production of paint films with highly improved properties and the acceleration of the reticulation reactions which reduces the required storage space.

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 INTRODUCTION

After defining the main paint constituents in the article [M 1 505] , this dossier examines the general properties of anticorrosive paint films. The variety of binders available makes it possible to design both air-drying and oven-drying paints.

In air-drying paints, the chemical reactions that produce a film-forming layer on the metal substrate take place without any external energy input. In oven-drying paints, on the other hand, energy in the form of heat is essential to enable the cross-linking reactions to take place.

Oven paints have a special feature:

  • to be presented in a single pack, given their stability at room temperature;

  • produce paint films with improved mechanical properties (surface hardness, scratch resistance, etc.) compared to those obtained with air-drying paints;

  • reduce storage areas on production sites, given the speed with which paint film cross-links with metal substrates.

To better understand these differences, the main properties of these paints are summarized in the tables 1 to 5 .

Readers are reminded that a subsequent dossier, [M 1 507] , deals with paint application equipment.

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Paint protection and decoration