The adhesion of epoxy cataphoretic coating on phosphatized hot-dip galvanized steel

Abstract

The influence of hot-dip galvanized steel surface pretreatment on the adhesion of epoxy cataphoretic coating was investigated. Phosphate coatings were deposited on hot-dip galvanized steel and the influence of fluoride ions in the phosphating plating bath, as well as the deposition temperature of the plating bath, were investigated. The dry and wet adhesion of epoxy coating were measured by a standard pull-off method. The surface roughness of phosphatized galvanized steel was determined, as well as the wettability of the metal surface by emulsion of the epoxy resin in water. The adhesion of epoxy coatings on phosphatized hot-dip galvanized steel was investigated in 3wt.%NaCl.

U radu je ispitivana modifikacija površine pocinkovanog čelika fosfatnim prevlakama na adheziju epoksidne prevlake na fosfatiranom pocinkovanom čeliku. Površina pocinkovanog čelika je modifikovana hemijskim taloženjem fosfatnih prevlaka, pri različitim koncentracijama fluoridnog jona u rastvoru za fosfatiranje, kao i na različitim temperaturama rastvora za fosfatiranje i praćena je pramena adhezije epoksidne kataforetske prevlake na njoj, pre i tokom delovanja korozionog agensa. Ispitivana je hrapavost modifikovanih površina pocinkovanog čelika, kao i njihova kvašljivost emulzijom epoksidne smole u vodi. Adhezija epoksidih prevlaka na fosfatiranom pocinkovanom čeliku je ispitivana u rastvoru 3mas.% NaCl.