Corrosion can be controlled by providing a barrier against the passage of ions,oxygen and water. The lower the permeability of the coating for these species, the better the barrier properties. It is important to realize that a barrier coating cannot repair corrosion products or other surface impurities already present on the metal surface. For corrshield properties, these coatings use a new pure epoxy system technology. They either reduce or eliminate the pre-treatment necessity. It is zinc rich epoxy based on thermosetting powder coating designed to enhance the Rust resistance of steel items. It has been designed as a base coat for powder top coats. Zinc Primer has a multitude of users over steel objects. If chemical treatment is difficult, a zinc base powder primer provides the solution on shot blasted steel.
Rusting starts when the coating is damaged, the underlying metal could be exposed and the presence of water and aggressive species induces the onset of corrosion.Corrosion is defined as an electrochemical deterioration of a metal due to the reaction with its environment involving the oxidation of a metal.
The local atmosphere and special stresses of the structure greatly affect the durability of corrosion.
Classifies atmospheric environments into following categories:-
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