Influencia del “skin–pass” en el comportamiento a la corrosión de acero galvanizado por inmersión en caliente

P.R. SERÉ; W.A. EGLI; C.I. ELSNER; A.R. DI SARLI

Valparaiso

Congreso; 12º Congreso Binacional de Metalurgia y Materiales-CONAMET/SAM 2012; 2012

CONAMET-SAM

The "skin-pass" or temper rolling of galvanized steel is a cold deforming process that is performed after the galvanizing and before the painting processes. Deforming during the "skin pass" is low (0.5-4%). The “skin-pass” process aims are: a) improve the surface appearance by eliminating the "flower" feature of hot-dip zinc coatings, b) reduce the yield stress and eliminate the characteristic Lüders bands of low carbon steels, and c) improve the paint adhesion through the improvement of material roughness. In this paper, the corrosion behavior of hot-dip galvanized steel deformed between 0.8 and 3.5% through the "skin-pass" process, was studied. Potentiodynamic polarization and stripping techniques were applied. Moreover, standardized accelerated corrosion tests were performed. The coatings were characterized by optical and scanning electron microscopy.