Anticorrosion adhesion promoters

Before applying nonfouling paints, the cleaned surface of the hull is covered with an adhesive sublayer or a layer of adhesion promoter, and anticorrosion paint. In seawater tests panels covered with these paints do not foul even after 27 months of exposition panels covered with normal paints fouled by 100% already after 2 months. The serviceability of paints... 

Uses Corrosion inhibition, dispersants, dewatering, emuisification rhe-oiogy modifiers, adhesion promoters for oii fieids, metai working, paints, inks, anticorrosives, acid cieaning. fioccuiation Trade Names imidazoiine 18 NH... 

The electrochemical action of red lead results from the fact that lead has valencies of 2 and 4 in lead orthoplumbate Pb(IV) compounds are reduced to Pb(II) in the cathodic region [5.147]. The chemical anticorrosive effect is a result of lead soaps that are formed when fatty acids in the binder react with the red lead. The lead soaps permeate the paint film as lamellae, and give good mechanical strength, water resistance, and adhesion to the steel surface. Furthermore, the corrosion-promoting chloride and sulfate ions are precipitated by lead(II) ions [5.148]. 

Lead chromate pigments are mainly used as corrosion inhibitive pigments. These pigments are of low opacity and can be combined with higher-opacity pigments for use in primers. Zinc chromate, also an anticorrosion pigment, is used in metal pretreatments such as wash primer, which also promotes adhesion to aluminum and steel. 

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