Aluminum Protection by Using Green Zirconium Oxide Layer and Organic Coating: An Efficient and Adherent Dual System

Vitor B. Moreira, Alvaro Meneguzzi, Emilio Jiménez-Piqué, Carlos Alemán and Elaine Armelin
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Vitor B. Moreira: Departament d’Enginyeria Química, Campus Diagonal Besòs (EEBE), Universitat Politècnica de Catalunya, 08019 Barcelona, Spain
Alvaro Meneguzzi: Programa de Pós-graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, Brazil
Emilio Jiménez-Piqué: Department of Materials Science and Engineering, Campus Diagonal Besòs (EEBE), Universitat Politècnica de Catalunya, 08019 Barcelona, Spain
Carlos Alemán: Departament d’Enginyeria Química, Campus Diagonal Besòs (EEBE), Universitat Politècnica de Catalunya, 08019 Barcelona, Spain
Elaine Armelin: Departament d’Enginyeria Química, Campus Diagonal Besòs (EEBE), Universitat Politècnica de Catalunya, 08019 Barcelona, Spain

Sustainability, 2021, vol. 13, issue 17, 1-16

Abstract: In this work, the use of ZrO 2 nanocoating in aluminum substrates, generated by controlled electrochemical chronoamperometry in hexafluorozirconic acid solutions (H 2 ZrF 6 ·5H 2 O), resulted in a lower porous films than that obtained by chemical conversion coating. After the application of an epoxy coating, long-term cyclic immersion corrosion tests and scratch tests proved the superior protection of the dual system and the coating lifespan, thanks to the enhanced adhesion of ZrO 2 intermediate layer and the organic coating. As zirconium-based electrolytes are considered more friendly bath if compared to that of other conversion coating processes, like chromating, phosphating or anodizing processes, the study opens new insights to the protection of structural metals in sectors such as automotive, naval and aerospace industries. The main advantages are the employment of lightweight intermediate pre-treatment (nanoscale), compared to conventional ones (microscale), and reduction of waste slurry (electrolyte bath free of additives).

Keywords: zirconium conversion coating; green coating; organic coating; hardness test; corrosion analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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