Corrosion rates of green novel hybrid conversion coating on aluminium 6061

The use of chromate conversion coatings have been limited by several protocols as a result of their carcinogenicity and toxicity towards humans and the environment. Searches are ongoing for chromate replacement in coating baths and processes. This paper describes the comparison among the corrosion r...

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Bibliographic Details
Published in:Results in engineering 2020-09, Vol.7, p.100159, Article 100159
Main Authors: Oki, M., Adediran, A.A., Ikubanni, P.P., Adesina, O.S., Adeleke, A.A., Akintola, S.A., Edoziuno, F., Aleem, A.
Format: Article
Language:English
Subjects:
Aluminium
Corrosion performance
Hybrid conversion coating
Polarization
Sabdariffa calyx
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Summary:The use of chromate conversion coatings have been limited by several protocols as a result of their carcinogenicity and toxicity towards humans and the environment. Searches are ongoing for chromate replacement in coating baths and processes. This paper describes the comparison among the corrosion rates of a novel hybrid conversion coating derived from water extracts of hibiscus sabdariffa calyx in conjunction with ammonium molybdate, a molybdate conversion coating and the so-called chromate conversion coating. Potentiodynamic polarization measurement in 3.5 ​wt% sodium chloride solution was employed in ranking the coatings as sabdariffa molybdate being more corrosion resistant than chromate, which in turn out performed molybdate. •Novel hybrid coating from Sabdariffa calyx and molybdate was developed on aluminum.•The performance ranking of coatings was Sabdariffa molybdate ​> ​chromate ​> ​molybdate.•Sabdariffa calyx enhanced the performance of molybdate coating on aluminum.
ISSN:2590-1230
2590-1230
DOI:10.1016/j.rineng.2020.100159