COMPARATIVE STUDY OF THE CORROSION BEHAVIOR OF HOT DIP GALVANIZED, GALVANNEAL AND GALVALUME COATED STEELS

• Published in: Tecnologia em metalurgia, materiais e mineração Vol. 10; no. 3; pp. 280 - 286
• Main Authors: Álvaro Pritzel dos Santos, Joel da Silva Rodrigues, Luís Frederico Pinheiro Dick
• Format: Journal Article
• Language: English
• Published: Associação Brasileira de Metalurgia, Materiais e Mineração 01-10-2013
• Subjects: Corrosion; Hot dip galvanized; Galvalume; Galvanneal
• ISSN: 2176-1515; 2176-1523
• DOI: 10.4322/tmm.2013.039

Corrosion attack of Hot Dip Zn coatings on steels is comparatively studied. For this, the electrochemical behavior of the coatings hot dip galvanized (GI), galvanneal (GA) and galvalume (Zn55Al) are analyzed in chloride solutions by cyclic voltammetry and by Scanning Vibrating Electrode Technique, with and without the incidence of white light. Coatings were characterized by Scanning Electronic Microscopy and Energy Dispersive X-Ray Spectrometry. The results show that the incidence of white UV-VIS light has a minor influence on the corrosive process, although the coatings contain intermetallic phases with semiconductor nature. The tests show that among the three coatings, GA has the slowest dissolution rate, when in contact with the steel for high exposed areas of steel.