Coating Terms

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Description
Coating defect described by the insufficient adhesion observed between the successive layers of a coating system. Successive application of chemically incompatible layers, and degradation of surface active compounds due to overbaking of lower layers can be typical factors causing intercoat adhesion failure.
Test performed to measure the degree of adhesion of the organic coating film to the surface after application and drying of the coating. Adhesion performance is checked by adhering a tape to the thoroughly cut coating film and pulling away rapidly to determine whether the coating comes off and if it does, to what extent it does.
State in which two surfaces (i.e., solid-liquid or solid-another solid) held together by attractive forces. Components that results in adhesion are: (a) mechanical component, (b) chemical component, (c) dispersion component, (d) electrostatic component and (e) diffusion component. In any adhesion event, all or some of the components play a role.
Primers applied as a thin layer to promote interlaminar adhesion on surfaces difficult to adhere. The surfaces difficult to adhere are mainly polyolefinic structured plastic surfaces like polyethylene and polypropylene etc. and some aluminium alloy surfaces. Examples of adhesion promoters are chlorinated polyolefin, organosilanes and polyvinylbutyral based primers.