Issue 21, 2015

Bioinspired adhesive polymer coatings for efficient and versatile corrosion resistance

Abstract

The anticorrosion ability of ultrathin coatings with bio-inspired organic polymers is demonstrated. We prepared a series of catechol-containing poly(alkyl methacrylate)s by free radical polymerization. These copolymers were spin-coated on various corrosion susceptible metal/alloy substrates of magnesium, aluminum, copper and iron without any harsh pretreatment. Several key factors like molecular structure, composition ratio and processing conditions were wisely tailored to afford a transparent, firm and sub-micron polymer coating on those substrates. Corrosion resistance of the polymer-coated substrates was thoroughly investigated by immersion tests in salt-water and acidic solutions, polarization tests, and visual inspection. Formation of an anomalous dense layer of ca. 5 nm thickness adjacent to the metal surface and a remarkable effect of thermal treatment were clearly observed by neutron reflectivity measurements, leading to a highly protective ability against foreign molecules e.g. water or corrosive ions. A key molecular design for anticorrosive polymer coating was revealed to be a combination of strong and versatile binding ability of catechol units and defect free polymer layers formed on the metal substrates in the presence of hydrophobic alkyl chains.

Graphical abstract: Bioinspired adhesive polymer coatings for efficient and versatile corrosion resistance

Supplementary files

Article information

Article type
Paper
Submitted
29 Dec 2014
Accepted
28 Jan 2015
First published
28 Jan 2015

RSC Adv., 2015,5, 15977-15984

Author version available

Bioinspired adhesive polymer coatings for efficient and versatile corrosion resistance

D. Payra, M. Naito, Y. Fujii, N. L. Yamada, S. Hiromoto and A. Singh, RSC Adv., 2015, 5, 15977 DOI: 10.1039/C4RA17196A

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