Potentiodynamic study of Al-Mg alloy with superhydrophobic coating in photobiologically active/not active natural seawater

Colloids and Surfaces. B, Biointerfaces
Alessandro BenedettiMichele Ferrari

Abstract

Superhydrophobic coating technology is regarded as an attractive possibility for the protection of materials in a sea environment. DC techniques are a useful tool to characterize metals' behavior in seawater in the presence/absence of coatings and/or corrosion inhibitors. In this work, investigations concerning Al-5%Mg alloy with and without a sprayed superhydrophobic coating were carried out with potentiodynamic scans in photobiologically active and not active seawater (3 weeks of immersion). In not photobiologically active seawater, the presence of the superhydrophobic coating did not prevent pitting corrosion. With time, the coating underwent local exfoliations, but intact areas still preserved superhydrophobicity. In photobiologically active seawater, on samples without the superhydrophobic coating (controls) pitting was inhibited, probably due to the adsorption of organic compounds produced by the photobiological activity. After 3 weeks of immersion, the surface of the coating became hydrophilic due to diatom coverage. As suggested by intermediate observations, the surface below the diatom layer is suspected of having lost its superhydrophobicity due to early stages of biofouling processes (organic molecule adsorption and ...Continue Reading

References

Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew J B Milne, A Amirfazli
Dec 17, 2010·Biofouling·M P SchultzW M Hertel
Dec 3, 2014·Colloids and Surfaces. B, Biointerfaces·Eduardo GuzmánLibero Liggieri
Mar 12, 2015·Advances in Colloid and Interface Science·Michele Ferrari, Alessandro Benedetti
Oct 1, 2008·Journal of Phycology·Kevin J FlynnYao Xue

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Citations

Nov 10, 2020·Advances in Colloid and Interface Science·Michele Ferrari, Francesca Cirisano
Jan 21, 2021·Materials·Anna DobkowskaHalina Garbacz

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