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Amphiphilic maleic acid copolymers as corrosion inhibitors for aluminum pigment
Author(s) -
Müller B.,
Paulus A.,
Lettmann B.,
Poth U.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980912)69:11<2169::aid-app8>3.0.co;2-e
Subject(s) - copolymer , maleic acid , polymer chemistry , aqueous solution , ethyl acrylate , acrylate , monomer , styrene , maleic anhydride , materials science , chemistry , corrosion , acrylic acid , organic chemistry , polymer
Aluminum pigments react in aqueous alkaline media (e.g., water‐borne paints) by the evolution of hydrogen. Maleic acid copolymers, which were synthesized by copolymerization of maleic acid anhydride, styrene, and acrylic esters (ethyl‐, n ‐butyl‐, n ‐hexyl‐, n ‐dodecyl‐, and n ‐octadecyl acrylate) inhibit this corrosion reaction. With the increasing chain length of the ester alcohol of the acrylate monomer, the evolved hydrogen volume decreases (i.e., the corrosion inhibiting effect increases). There seems to be a potential correlation between the number of carbon atoms of the ester alcohol of the copolymers and the evolved hydrogen volumes. With the addition of 0.5 wt % of the copolymers with n ‐butyl, n ‐hexyl, n ‐dodecyl‐, and n ‐octadecyl acrylate no hydrogen evolution was observed at pH 8 within 21 days (complete corrosion inhibition). Conductivity measurements of aqueous copolymer solutions indicate that with an increasing chain length of the ester alcohol, the copolymers possibly associate by hydrophobic bonding. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 2169–2174, 1998