Corrosion Protection by Novel Conversion Coatings on Structural Al 6061

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Published: Nov 2, 2022
DOI: https://doi.org/10.14416/j.asep.2022.03.005
Keywords:
Conversion coatings Molybdate Vanadate Chromate Aluminium alloy

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Makanjuola Oki
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria
Adeolu Adesoji Adediran
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria
Anyim Ikechukwu
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria
Charles O. Onokohwomo
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria
Chuka Bosa
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria
Sarah A. Akintola
Department of Petroleum Engineering University of Ibadan, Ibadan, Nigeria
Olanrewaju Seun Adesina
Department of Mechanical Engineering, College of Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria

Abstract

Chromate conversion coatings have witnessed limited acceptability in recent times. The coatings contain Cr (VI) species that have been classified as environmental hazards and injurious to human health. Thus, the use of environment-friendly and non-carcinogenic novel inorganic-inorganic hybrid conversion coatings are being explored. Vanadate (VCC), hybrid Vanadate/Molybdate (HCC) conversion coatings on Al6061 have been classified in terms of corrosion and adhesion performance with reference to the untreated alloy. Natural exposure tests in the atmosphere and stagnant near-neutral 3.5% sodium chloride solution, as well as potentio-dynamic polarization measurements showed that the corrosion rate for HCC is lower for Vanadate, which in turn outclassed the ‘bare’ alloy. However, clusters of passive incipient pits were revealed on the former after 120 h of exposure in stagnant chloride solution. Both conversion coatings outperformed the untreated aluminium alloy after atmospheric corrosion and adhesion tests.

Article Details

How to Cite
Oki, M., Adediran, A. A., Ikechukwu, A., Onokohwomo, C. O., Bosa, C., Akintola, S. A., & Adesina, O. S. (2022). Corrosion Protection by Novel Conversion Coatings on Structural Al 6061. Applied Science and Engineering Progress, 16(1), 5806. https://doi.org/10.14416/j.asep.2022.03.005
Issue
Vol. 16 No. 1 (2022)
Section
Research Articles

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