Development and characterisation of zinc oxalate conversion coatings on zinc

Author(s)

Ferreira, Jr., J. M. ^{[1, 2]} ; Oliveira, M. ^[3] ; Trindade, G. F. ^[2] ; Santos, L. C. L. ^[1] ; Tomachuk, C. R. ^[4] ; Baker, M. A. ^[2]

Affiliation

^[1] Univ Fed Bahia, Postgrad Program Chem Engn, R Prof Aristides Novis 2, 2 Andar, BR-40210630 Salvador, BA - Brazil

^[2] Univ Surrey, Fac Engn & Phys Sci, Guildford GU2 7XH, Surrey - England

^[3] CCTM, Energy & Nucl Res Inst, IPEN, Av Prof Linea Prestes, BR-2242 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Engn Sch Lorena, EEL, Environm & Basic Sci Dept, Lorena, SP - Brazil

• Document type: Journal article
• Source: Corrosion Science; v. 137, p. 13-32, JUN 2018.
• Web of Science Citations: 3

Abstract

The interactions between oxalic acid and zinc substrates have been studied through the deposition of zinc oxalate coating by immersion. The corrosion behaviour of zinc was investigated by surface observation and electrochemical impedance spectroscopy (EIS). Better protective properties were observed for samples treated with 10(-1) M oxalic acid compared to other concentrations and the enrichment of corrosion product by Na was observed. The electrochemical results reveal that the oxalate coating increases corrosion protection in corrosive medium. It is proposed that the zinc oxalate coating formed act as a basis for anchoring zinc corrosion products forming simonkolleite improving corrosion resistance. (AU)

• FAPESP's process: 15/09952-0 - Surface treatment process for application in zinc coating environmentally friendly
• Grantee: Célia Regina Tomachuk dos Santos Catuogno
• Support Opportunities: Regular Research Grants