Biopolymer Composites and Nanocomposites for Corrosion Protection of Industrial Metal Substrates
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Taylor & Francis Group
Abstract
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Corrosion is a critical problem that can be found in all industries worldwide. Corrosion is particularly
serious in the petroleum industry, due to the large amounts of metallic based assets located throughout
the entire supply chain. Annual costs of corrosion and its consequences are estimated to be 3 – 5 % of
GDP for developed countries of the world. Corrosion mitigation strategies adopted by some industries
include materials selection, coatings and linings, cathodic protection and the use of corrosion inhibitors
amongst others. The use of biopolymers for corrosion protection of industrial metal substrates
particularly as corrosion inhibitors has generated interest globally because they are considered as
environmentally friendly in addition to the possession of multiple adsorption centres. However, it is
found that most biopolymers studied function as moderate corrosion inhibitors. Some of the steps taken
to offset this drawback include copolymerization, addition of substances to exert synergistic action as
well as the incorporation of inorganic substances in nano-size into the biopolymer matrix in order to
improve the corrosion inhibition performances of the biopolymers. The application of biopolymer
composites and nanocomposites as anticorrosion materials has shown promising results and is believed
to form metal chelate which could block metal surfaces from aggressive ions present in corrosive media.
In this chapter, the application of composites and nanocomposites of biopolymers such as chitosan,
carboxyl methylcellulose, gum Arabic, Xanthan gum for corrosion protection of industrial metal
substrates in different corrosive media is discussed.
Keywords
QD Chemistry