Thiazole derivatives as corrosion inhibitors for C-steel in sulphuric acid solution

Abstract

KEYWORDS5-phenylazo-2-thioxo-thiazolidin-4-one and four of its derivatives have been investigated as corrosion inhibitors for C-steel in 1 M sulphuric acid solution using weight-loss and galvanostatic polarization techniques. The efficiency of the inhibitors increases with increase in inhibitor concentration but decreases with a rise in temperature. The conjoint effect of the thiazole derivatives and KBr, KSCN and KI has also been studied. The apparent activation energy (Ea*) and other thermodynamic parameters (ΔS*, ΔH* and ΔG*ads) for the corrosion process have also been calculated. The galvanostatic polarization data indicated that, the inhibitors were of mixed-type, but the cathode is more polarized than the anode. The slopes of the cathodic and anodic Tafel lines (ßc and ßa) are approximately constant and independent of the inhibitor concentration. The adsorption of these compounds on C-steel surface has been found to obey the Temkin's adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.Corrosion inhibitors C-steel Weight loss Synergistic effect Polarization Thiazole derivatives

Lornoxicam & Tenoxicam Drugs as Green Corrosion Inhibitors for Carbon Steel in 1 M H2SO4Solution

“…This may be due to adsorption of the inhibitor over the corroding surface 47) iii) the slopes of the anodic and cathodic Tafel lines (β a & β c ) were slightly changed on increasing the concentration of the tested compounds. This indicates that there is no change of the mechanism of inhibition in presence and absence of inhibitors and that the inhibitor affects both anodic and cathodic reactions 48) i.e. mixed-type.…”

Lornoxicam & Tenoxicam Drugs as Green Corrosion Inhibitors for Carbon Steel in 1 M H2SO4 Solution

“…were slightly changed on increasing the concentration of the tested compounds. This indicates that there is no change of the mechanism of inhibition in presence and absence of inhibitors and that the inhibitor affects both anodic and cathodic reactions 48) i.e. mixed-type.…”

Corrosion Inhibition of Aluminum–Silicon Alloy in Hydrochloric Acid Solutions Using Carbamidic Thioanhydride Derivatives

“…The slopes of the anodic and cathodic Tafel lines (b a , b c ) were slightly changed on increasing the concentration of the investigated compounds. This means that there is no change of the mechanism of the inhibition in presence and absence of inhibitors and those inhibitors affects both anodic and cathodic reactions [38], i.e., it is mixed-type inhibitors. Inhibition efficiency (% g) and degree of surface coverage (h) were calculated using the following equation:…”