EFFECT OF BENDING ANGLES ON THE GALVANIZING AND GALVANNEALING COATINGS ON THE STEEL PLATE COLD COMMERCIAL (SPCC)

Abstract

This study conducted the effect of bending angles on the galvanizing and galvannealing coatings
on the steel plate cold commercial. Both coatings consisted of serial Fe-Zn intermetallic layers
such as ïº-FeZn13, ï¤p-FeZn10, ï¤k-FeZn7 and ï‡-Fe3Zn10 layers with different fraction. The greater
part of the first coating was the ïºï€ phase and in the other was the ï¤ phase. Formable of the
coatings was examined using bending test with angles about 150, 120, 90, 60 and 30 degrees. As
results, the galvanizing coating except for bending angle of 30 degree seems strong for tension
load. By contrast, most galvannealing coatings bent in all angles were cracks running
perpendicular from the steel surface to ï¨-zinc region. Similar to the tension load, compressed
load as resulted of the bending test did not provide any influence to the galvanizing coating, but
significantly lead to cracks in the galvannealing coating both parallel and vertical direction to
the steel surface.