DOI: 10.5176/2251-189X_SEES13.72
Authors: D. Jayaperumal and ST.Selvamani
Abstract:
The inhibition efficiencies of Cyclo hexylamine (CHAM) and n-Octylamine (NOAM) on the corrosion of mild steel in 15{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} commercial hydrochloric acid have been evaluated by mass loss method, electrochemical techniques and surface analysis techniques with 0-1{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} inhibitor concentration at 30oC and 105oC. Both CHAM and NOAM are excellent inhibitors for the above-mentioned system at 30oC. But at 105oC, they are good inhibitors. CHAM gives 83{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} and 34{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} inhibition efficiencies at 30oC and 105oC respectively for 1{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} inhibitor concentration where as NOAM gives 99{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} at 30oC and 61{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} at 105oC efficiencies respectively for 0.6{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} inhibitor concentration. Polarization studies confirm that CHAM and NOAM are mixed type inhibitors. CHAM and NOAM obey Tem kin’s adsorption isotherm at both the temperatures. UV reflectance, FT-IR and SEM studies confirm that the surface of mild steel is not affected at the maximum concentration of CHAM and NOAM and at 30oC where as at 105oC, there are some surface changes on the mild steel.
Keywords: Cyclo hexylamine, n-Octylamine, mild steel, commercial hydrochloric acid, Oil well acidization.
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