EFFECT OF PASSIVATION TREATMENT ON ADHESION AND PROTECTIVE PROPERTIES OF STEEL COATED WITH POLYMERIC FILM

E. ZUMELZU; C.R. TOMACHUK; A.R. DI SARLI; H.G. DE MELO

NATAL

Congreso; 22 Congresso Brasileiro de Engenharia e Ciência dos Materiais (CBECIMAT 2016); 2016

CBECIMAT

The surface of steel coated with Cr3+-based passivation layer andpolyethylene therephtalate (PET) polymeric film was investigated by X-rayphotoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Thiscoating was applied to the steel surface through a co-lamination industrialprocedure. Aswell, the coated steel porosity was characterized by BET (Brunaer, Emmert,Teller) gas adsorption technique. Basic aspects of the polymer adhesion to thepassivated steel were also studied by determining the force and energy adhesionbetween them. The AFMresults showed that the PET coating presenting roughness in the nanometerscale. XPS diagrams indicated the absence of surface contaminants and flaws onthe applied coating. Moreover, XPS examination after coating removal showed lowcontaminant levels on the Cr layer and absence of Cr6+ peaks. This material can be anon-polluting alternative to replace tinplate and Cr6+ conversionlayer in the food industry, being compatible with the packed product.