[a]* Department of Chemistry, Mount Zion college of Engineering and Technology,
Pudukkottai- 622507,Tamil Nadu, India. Email:firstname.lastname@example.org
[b] Department of Chemistry, RVS School of Engineering and Technology, Dindugul-
624 005,Tamil Nadu, India. email: email@example.com
[c] PG and Research Department of Chemistry, GTN Arts College, Dindigul – 624005,
Tamil Nadu, India.
Corrosion resistance of mild steel in simulated concrete pore solution in the presence and absence of 4000 ppm of chloride ion has been evaluated by weight loss method.The experiments have been carried out in presence of corrosion inhibitor such as Tri sodium citrate(TSC). It is observed that when 200 ppm of TSC is added 81% inhibition efficiency is obtained for the 4000 ppm chloride system. In the absence of chloride system, the corrosion inhibition efficiency is 99%. VIBGYOR coloured film were observed on the metal surface. The mechanistic aspects of corrosion inhibition have been investigated by Electrochemical studies such as polarization study and AC impedance spectra. It is observed that in the presence of inhibitor LPR value increases, corrosion current decreases, charge transfer resistance increases, Impedance value increases,Double layer capacitance value decreases. It is concluded that addition of TSC increases corrosion resistance of mild steel in simulated concrete pore solution which is nothing but a saturated solution of Ca(OH)2.
Keywords: Simulated concrete pore solution, mild steel, corrosion inhibition, TSC(Tri sodium citrate), Electrochemical studies.