Abstract: Inhibition action and adsorption behavior of sodium lignosulphonate on Q235 steel in simulated concrete solution were investigated by means of potentiodynamic polarization and surface analysis techniques. The results indicated that sodium lignosulphonate have good pitting corrosion inhibition for Q235 steel in simulated concrete solution. The inhibition efficiency strengthened with increase of sodium lignosulphonate concentration. The adsorption reaction was a spontaneous exothermic process and followed Langmuir isotherm. It belonged to mix-type adsorption mainly dominated by chemisorption. The coadsorption of sulfonic acid group and Ca2+ belonged to physisorption. Carboxyl and benzene ring structure had coordinated with Fe-3d orbitals, which belonged to chemisorption. Adsorption film of sodium lignosulphonate formed on Q235 steel can reduce adsorption of Cl- so pitting corrosion caused by Cl- can be effectively suppressed.
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2019, Vol. 33 
