Use of 1-Phenylamino-3-(4-Phenylthiosemi carbazone)-Butane-I,3-dione Derivatives as Corrosion Inhibitors for C-Steel in Acidic Chloride Solutions

Abstract

The corrosion inhibition of nitrogen, oxygen and sulphur containing compounds in acidic chloride solutions was studied by chemical and electrochemical techniques. The percentage inhibition efficiency was calculated from both methods is in good agreement. The corrosion rate was found to be a function of the nature, concentration and temperature of the medium. The increase in temperature was found to increase the corrosion rate. The inhibitors are adsorbed on the C-steel surface according to the Langmuir isotherm. Some themrodynamic functions were computed and discussed. Quantum data were calculated and the results of HOMO and LUMO showed that the increase in energy of HOMO corresponds to an increase in the inhibition efficiency.

Corrosion protection of carbon steel in hydrochloric acid solutions using thiourea derivatives

“…This indicates that there is no change of the mechanism of inhibition in presence and absence of inhibitors and indicates that these compounds acted as mixed type inhibitors, but the cathode is more pref erentially polarized than the anode. The higher values of Tafel slope can be attributed to surface kinetic pro cess rather the diffusion controlled process [32]. The constancy and the parallel of cathodic slope obtained from the electrochemical measurements indicate that the hydrogen evolution reaction was activation con trolled [33] and the addition of these derivatives did not modify the mechanism of this process.…”

“…Hydrazide derivatives offer special affinity to inhibit corrosion of metals in acid solutions [12][13][14][15]. Indole derivatives [32][33][34], benzimidazole derivatives [35][36][37][38][39] were used as corro sion inhibitors for metals and alloys, the purpose of this paper is to compare the corrosion inhibition data derived from EFM with that obtained from Tafel extrapolation, EIS and weight loss techniques. Also, the morphology of carbon steel surfaces was investi gated by SEM and EDX.…”

Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 M H2SO4

“…This means that the thiadiazole derivatives are mixed type inhibitors, but the cathode is more preferentially polarized than the anode. The higher values of Tafel slope can be attributed to surface kinetic process rather the diffusion-controlled process [28]. The constancy and the parallel of cathodic slope obtained from the electrochemical measurements indicate that the hydrogen evolution reaction was activation controlled [29] and the addition of these derivatives did not modify the mechanism of this process.…”

Some Schiff base compounds as inhibitors for corrosion of carbon steel in acidic media

“…The dependence of corrosion current density on the temperature can be expressed by Arrhenius equa tion: (8) where A is the pre exponential factor and is the apparent activation energy of the corrosion process. Arrhenius plot obtained for the corrosion of carbon steel in HCl solution is shown in Fig.…”

“…The highly corrosive nature of aqueous mineral acids on most metals requires degree of restraint to achieve economic maintenance and operation of equipment, minimum loss of chemical product and maximum safety condition. Organic compounds containing nitrogen atoms are commonly used to reduce the corrosion attack on steel in acidic media [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Generally, the heterogeneous organic compounds having higher basicity and electron den sity on the hetero atoms like N, O, S have tendency to resist corrosion.…”