Coating processes – Interior of hollow article coating – Metal base
Patent
1994-10-25
1997-05-27
Pianalto, Bernard
Coating processes
Interior of hollow article coating
Metal base
427327, 427409, 427410, B05D 722
Patent
active
056330383
ABSTRACT:
Carbon steel surfaces, particularly inside wall surfaces of steel pipelines, are treated with an organosilane coupling agent to improve the adhesion of epoxy, vinyl ester and similar polymer-type protective coatings to the surface. The organosilane coupling agent is applied to a cleaned steel surface in an aqueous and/or alcohol solution, the surface is dried to allow the organosilane to cure and the protective coating is then applied to the surface. Steel pipelines are coated in situ by cleaning the interior of the pipeline with hydrochloric acid, fresh water and a passivation agent such as phosphoric acid followed by pumping a slug of the organosilane coupling agent, in solution, through the pipeline between spaced apart pigs. The coupling agent is dried and a polymer coating is then applied by pumping a slug of the coating through the pipeline, also between two spaced apart pigs.
Atlantic Richfield Company
Martin Michael E.
Pianalto Bernard
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