Surface treatment process for application in zinc coating environmentally friendly

• Grant number: 15/09952-0
• Support Opportunities: Regular Research Grants
• Start date: October 01, 2015
• End date: September 30, 2017
• Field of knowledge: Interdisciplinary Subjects
• Principal Investigator: Célia Regina Tomachuk dos Santos Catuogno
• Grantee: Célia Regina Tomachuk dos Santos Catuogno
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
• Associated researchers: Gustavo Aristides Santana Martinez ; Hélcio José Izário Filho ; Hercílio Gomes de Melo
• Associated research grant(s): 16/50454-6 - Development and characterization of chromium-free layers applied on galvanised steel, AP.R SPRINT

Abstract

The conversion processes are very important, both as a means of protection against corrosion and for the surface preparation for paint application. Many commercial surface treatments currently use electrolytes containing hexavalent chromium salts. However, although effective, these processes should be banned from industrial use due to the toxic and carcinogenic properties of the residues generated. The literature shows that, so far, available processes do not produce surface layers with the same corrosion protection properties as the chromate conversion layers. Besides, the layers formed by the new proposed processes do not offer similar adhesion to organic coatings. The aim of this project is to obtain conversion layers from hexavalent chromium salts free electrolytes, which show similar corrosion protection to that of the hexavalent containing types, in order to meet the environmental demands allowing the use of the installed electroplating lines in galvanic industries. The alternatives to be tested are electrolyte containing cerium salts and / or zirconium salts using either the chemical deposition process. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FERREIRA, JR., J. M.; OLIVEIRA, M.; TRINDADE, G. F.; SANTOS, L. C. L.; TOMACHUK, C. R.; BAKER, M. A.. Development and characterisation of zinc oxalate conversion coatings on zinc. Corrosion Science, v. 137, p. 13-32, JUN 2018. (15/09952-0)

FERREIRA, JR., J. M.; SOUZA, K. P.; ROSSI, J. L.; COSTA, I.; TRINDADE, G. F.; TOMACHUK, C. R.. Corrosion Protection of Electrogalvanized Steel by Surface Treatments containing Cerium and Niobium compounds. International Journal of Electrochemical Science, v. 11, n. 8, p. 6655-6672, AUG 2016. (15/09952-0)

FERREIRA, JR., J. M.; SOUZA, K. P.; QUEIROZ, F. M.; COSTA, I.; TOMACHUK, C. R.. Electrochemical and chemical characterization of electrodeposited zinc surface exposed to new surface treatments. SURFACE & COATINGS TECHNOLOGY, v. 294, p. 36-46, MAY 25 2016. (15/09952-0)