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Four fatty acids were used as a source of alkyl halides. Untraditionally tertiary amines were prepared by ethoxylation of aromatic and aliphatic fatty amines. These alkyl halide and tertiary amines were used to prepare 20 cationic quaternary ammonium surfactants (QAS S ). Their chemical structures were characterized and they tested as corrosion inhibitors for carbon steel in 1M HCl solution...