Effect of Combined Trisaminomethane and Hexadecyltrimethyl Ammonium Bromide (Hdtab) Inhibitors on Mild Steel in Nitric Acid

Cleophas Akintoye Loto, Roland Tolulope Loto
2018 Oriental Journal of Chemistry  
The effect of combined trisaminomethane (THAM) and hexadecyltrimethyl ammonium bromide (HDTAB) as chemical inhibitors for corrosion of mild steel in 1 M HNO 3 was investigated at the ambient temperature of 25°C. The investigation was done with gravimetric (weight loss) method and also with the potentiodynamic polarisation technique. A potentiostat, Digi-Ivy potentiostat, connected to a computer for data collection and analysis was used for potentiodynamic polarisation experiment. The effective
more » ... ent. The effective corrosion inhibition of the steel specimens in the HNO 3 test medium, using the combined inhibitors had its best performance achieved with the 6 g/ 250 mL HNO 3 concentration with weight loss of 2.99 g and a corrosion rate of 0.00913 mm/yr at 480 h of the experiment. This was closely followed with the 4 g/ 250 mL HNO 3 with 3.72 g weight loss at 480 h. At this concentration, the experiment also recorded polarisation resistance (Ω) values of 3.11E+01, corrosion rate of 1.95691E-05 mm/yr and current density of 0.000175A cm -2 for the 6 g 250 mL. The calculated inhibition efficiency values are, respectively, 39.2 and 24.3 % for both the 6 and 4 g 250 mL -1 HNO 3 concentrations at 480 h. The potentiodynamic polarisation results of ba and bc indicated mixed type inhibitors.
doi:10.13005/ojc/340347 fatcat:3cb5k3u73beihddpaadbvwzluy