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Tuesday, 14 August 2018
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Raw materials & technologies, Applications

Superhydrophobic coatings for higher corrosion resistance of aluminium

Friday, 9 February 2018

Scientists found a simple method to fabricate superhydrophobic coatings for combating bacterial colonization on aluminum with relevance to marine and medical applications.

Superhydrophobic coatings have excellent corrosion resistance of aluminum used in marine applications. Quelle: JensEnemark / Pixabay.

Superhydrophobic coatings have excellent corrosion resistance of aluminum used in marine applications. Quelle: JensEnemark / Pixabay.

Aluminum and its alloys are widely used in almost all industries and for marine and medical applications. However, their surfaces are easily colonized by bacteria that form biofilms and corroded by chemical reactions. The scientists report a simple method to fabricate polyaniline/chitosan/zinc stearate superhydrophobic coatings on aluminum with a micro–nanosurface structure by polymerization of aniline and deposition of chitosan and zinc stearate coating.

Suitable for marine and medical applications

The fabricated coatings have been characterized by ATR-IR, XRD, FE-SEM, and EDX. The superhydrophobic surface shows the highest water-repellent property with contact angle of 150.7°, which is responsible for antiadhesion of bacteria, antiicing property, and excellent corrosion resistance of aluminum. The corrosion behavior of the coating in the 3.5% NaCl solution was investigated by EIS and potentiodynamic polarization. The efficacies of the different coatings against bacteria that are commonly encountered in marine (Desulfovibrio desulfuricans) and medical applications (Staphylococcus aureus and Escherichia coli) are demonstrated.

The study is published in: Journal of Coatings Technology and Research  January 2018, Volume 15, Issue 1, pp 51–64.

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