DEVELOPMENT OF COATINGS ADHERENT TO METALS UNDER VIBRATION CONDITIONS
2006
Kronstein, Max
The factors which influence the life of paint systems on steel under saltwater and ultrasonic vibration were studied. The sonic effects were found to differ in their effect which decreases the adherence of the coating system and their effect which influences the coherence of the coatings with resultant cavitation. A study was made of the form in which the transducer energy is distributed through saltwater. The forms of failure which take place are: loosening of parts of the film from the steel substrate, local pinhole formation, and filament formation. Increased adherence has been found to result from: (a) step-by-step surface preparation, which includes surface inhibition and the driving off of entrapped air in the valleys of the surface profile; (b) the use of primers, including the specification wash-primer (F 117) and a red lead or zinc chromate vinyl primer so applied that there is inter-reaction between one application and the next; (c) avoiding solvent retention in each application before subsequent coatings are applied; (d) bringing the paint system to a desirable state of cross-linking, or polymer state, without going so far as to lose coherence in the paint film. A description of the pre-treatments used and experimental coating systems developed is given and discussed.
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