Corrosion Protection using Polymer Solution Coating

Abstract

Solvent-based polymeric coating prepared by ex-situ addition of crosslinked poly(styrene-codivinyl benzene) in poly(styrene)-ethyl benzene solution was used for corrosion protection of mild steel in simulated water equivalent to sea water and acid rain. Electrochemical impedance spectroscopy (EIS) technique was used to determine the corrosion resistance behavior of prepared polymeric coatings in 3.5 weight % of NaCl aqueous solution. EIS analysis suggested that the sample solution prepared by adding 1% cross-linked polymer in poly(styrene)-ethyl benzene solution, has better corrosion resistance as compared with the sample solution prepared by adding 3% and 2% of crosslinked polymer in poly(styrene)-ethylbenzene solution. Scanning electron microscopy (SEM) revealed that substrate coated with polymeric solution prepared by adding 1% of cross linked polymer in poly(styrene)-ethyl benzene solution showed less corrosion as compared with substrates coated with sample solutions prepared by adding 3% and 2% of crosslinked polymer in poly(styrene)-ethyl benzene solutions.