Yakatumirwa pa 2018-08-09 1. Imwe neimwe yezinc uye aluminium mu zinc aluminium coating iri mu passive state , nepo galvanized layer ine passivation layer ye 0.05 ~ 0.2μm pamucheto wekunze;2. Iyo zingi nealuminium mapepa mu zinc aluminium coating inotamba yakazara roll ...