Study of surface morphology and inhibition efficiency of mild steel in simulated concrete pore solution by lactic acid–Zn²⁺ system

• P.N. Devi¹, J. Sathiyabama¹ and S. Rajendran^1,2

¹ PG and Research Department of Chemistry, GTN Arts College, Dindigul-624005, India
² Corrosion Research Centre, Department of Chemistry, St Antony’s College of Arts and Sciences for Women, Amala Annai Nagar, Thamaraipadi (Post), Dindigul – 624 005, Tamilnadu, India

Abstract: The inhibition efficiency (IE) of lactic acid–Zn²⁺ system in controlling corrosion of mild steel in simulated concrete pore solution (SCPS) prepared in well water in the absence and presence of Zn²⁺ has been investigated by weight loss study. The formulation consisting of 250 ppm of lactic acid and 50 ppm of Zn²⁺ provides 94% of inhibition efficiency. Inhibition was found to increase with an increasing concentration of lactic acid and Zn²⁺. Polarization resistance was measured by weight loss method, polarization study. The surface morphology has been investigated by SEM and AFM.

Keywords: concrete corrosion, simulated concrete pore solution, mild steel, lactic acid, well water.

Int. J. Corros. Scale Inhib., 2017, 6, no. 1, 18–31 PDF (942 K)
doi: 10.17675/2305-6894-2017-6-1-2

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