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The Effect of 1, 3, 5-trimethyl-2, 6-diphenyl piperidin-4-one oxime on the Electrochemical Behaviour of Mild Steel in HCl Medium

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Author Affiliations

  • 1PG and Research Department of Chemistry, Govt. Arts College, Tiruchirappalli – 22, TN, India
  • 2PG and Research Department of Chemistry, Govt. Arts College, Tiruchirappalli – 22, TN, India
  • 3PG and Research Department of Chemistry, Alagappa Government Arts College, Karaikudi - 630 003 India

Res.J.chem.sci., Volume 6, Issue (3), Pages 16-19, March,18 (2016)

Abstract

Corrosion inhibitive performance of synthesized heterocyclic compound namely 1, 3, 5-trimethyl-2, 6-diphenyl piperidin-4-one oxime (TPO) was tested by weight loss study, electrochemical methods and SEM studies in 1M hydrochloric acid (HCl) medium against mild steel (MS). The weight loss studies were conducted at three different temperatures such as 30oC, 40oC and 50oC for various concentrations (0, 25, 50,100, 200 and 300 ppm) for 2h duration. The study revealed that the inhibition efficiency had positive correlation with enhancing TPO concentration and negative correlation with raising temperature. TPO adsorbs physically over mild steel surface obeying Temkin’s isotherm. Electrochemical parameters such as corrosion potential (Ecorr), corrosion current (icorr) and Tafel slopes (ba and bc) were determined using Tafel plot. The results showed that TPO decreases corrosion current significantly and behaves as mixed mode inhibitor. AC impedance measurement as determined by Nyquist plot were utilized to calculate the charge transfer resistance (Rct) and double layer capacitance (Cdl) whose results tribute each other. SEM studies revealed the film forming ability of TPO in HCl medium.

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