Лако-красочные материалы — производство

5.2.1

Introduction

Corrosion protection of metallic materials has, for a long time, been one of the key roles performed by organic coatings. The costs of damage incurred by corrosion of metals can be anything up to 5% of the gross domestic product in leading industrial nations [5.48]. Calculations over the past 50 years have shown that from 1800 million tons of iron used for structures, objects, etc., about 800 million tons have been lost through corrosion [5.49]. Itis well known, thatthe performance ofaprotective coating can distinctly be affected by incorporation of anticorrosive pigments. Therefore the choice of anticorrosive pigments used in conjunction with suitable binder systems plays a major role when trying to protect metals from corrosion by means of protective coatings. The most important role of anticorrosive pigments in protective coating technology is probably the control of corrosion, even though the degree of corrosion protection of a coating depends not only on the kind of the anticorrosive pigment used. One of the most important factors besides the pigment used is the resin system selected in order to formulate the coating. Before discussing anticorrosive pigments in detail, it is helpful to review what is actually meant by the term corrosion.

5.2.2