Relationship between the molecular structure and the inhibition performance of triazole compounds using electrochemical methods

Abstract

Corrosion inhibitors represent the most cost effective and flexible means of controlling internal corrosion associated with oil and gas production. Tests were carried out to demonstrate the structure/effect relationships which are effective in controlling the inhibition efficiency. To illustrate this approach, the substituent field effect at the paraposition of 1(Benzyl)1‐H‐4,5‐Dibenzoyl‐1,2,3‐ Triazole (BDBT) on corrosion inhibition has been investigated. Mild steel rotating cylinder electrode in acid media was used in conjunction with Tafel polarization technique, AC impedance measurements and continuous linear polarization resistance method. The nitro group was found to cause a considerable decrease in the corrosion inhibition of the parent compound BDBT. Owing to the induction effects of Br on the aromatic ring the bromo derivative has better inhibition protection than the methyl derivative. The corrosion rate profiles obtained from on‐line polarization technique showed that the inhibition capacity of the studied substituents at the para‐position increases as follows: NO2 < CH3 < Br < H.

Electrochemical and quantum chemical study of purines as corrosion inhibitors for mild steel in 1M HCl solution

“…In order to evaluate compounds as corrosion inhibitors and to design novel inhibitors, much more research works were concentrated on the studies of the relationship between structural characteristics of the organic compounds and their inhibiting effects [1][2][3][4][5]. It had been suggested that the most effective factors for the inhibiting effects are the electronegative atoms (such as, N, S, P, O, etc.)…”

Effect of the molecular structure of some quinones on their corrosion inhibiting action

“…9 Effect of the molecular structure of some quinones 1.361 C 6,3 -C 5, 4 1.340 C 7,14,2,5 -C 6,5,3, 13 1.484 C 11 -C 12 1.342 C-N 1.365 N-H 0.960 Table 2. Continued structure.…”

“…A considerable number of organic molecules were found to possess such corrosion inhibiting properties. In recent years attempts were made to correlate the protecting efficiency with the molecular structure of the inhibitor molecule [1][2][3][4][5][6][7][8][9][10][11][12]. The hope is, that a detailed knowledge of the effect of the chemical structure of a substance on its protective action would then allow to synthesize inhibitors with tailored properties.…”

Inhibition of carbon steel corrosion by imidazoline in carbon dioxide saturated oilfield brine solution

“…Corrosion inhibitors are widely used in the control of carbon steel corrosion in the oil technology on the basis of its easy application, availability and economical cost [10]. Corrosion inhibitors are the cheapest and most flexible agent in the control of internal corrosion of long pipelines in the oilfields [6,11]. Tests of forty corrosion inhibitors added into oilfield brine have been described [12].…”