Azole derivatives as inhibitors for the corrosion of irradiated and non‐irradiated carbon steel in HNO₃ solution

Abstract

PurposeThe purpose of this paper is to investigate the effects of several azole derivatives on the corrosion inhibition of irradiated and non‐irradiated plain carbon steel in 0.5 M nitric acid (HNO3) solutions at 30‐60°C and to study the mechanism of their inhibitive action.Design/methodology/approachThe inhibition efficiency was evaluated by means of weight‐loss determinations and polarization techniques at different temperatures. The type of adsorption isotherm, inhibition efficiency, surface coverage and kinetic data were determined.FindingsThe results showed that azole derivatives inhibit the corrosion of irradiated and non‐irradiated carbon steel in acidic solution. The inhibition efficiency increased with the inhibitor concentration and was greater in the case of irradiated carbon steel than for the non‐irradiated one. Kinetic parameters were calculated. The adsorption of inhibitors obeyed the Temkin Isotherm model. Thermodynamic parameters of activation were calculated in the presence of inhibitors.Research limitations/implicationsElectrochemical studies such as electrochemical impedance spectra will throw more light on the mechanism of inhibition.Practical implicationsAzole derivatives can be used as inhibitors in acid medium and addition of halides can improve their inhibition efficiency.Originality/valueThe investigation revealed the possible application of azole derivatives as environmentally friendly inhibitors for corrosion prevention under specific conditions.

Ethoxylated fatty amines as corrosion inhibitors for carbon steel in hydrochloric acid solutions

“…2 (5) where R corr is the rate of corrosion from weight loss, A is Arrhenius constant, R is the gas constant and T is the absolute temperature. Figure 3 represents Arrhenius plot (log R corr vs. 1/T ) for uninhibited and inhibited 1 M HCl containing 1000 ppm of the studied compounds.…”

“…Inhibitors are generally used in these processes to control the metal dissolution. Most well-known acid inhibitors for steel corrosion are organic compounds containing hetero atoms [2][3][4][5][6][7][8][9][10][11][12]. To be effective, an inhibitor must also displace water from the metal surface, interact with anodic or cathodic reaction sites to retard the oxidation and reduction corrosion reaction, and prevent transport ion of water and corrosion active species on the surface [13].…”

Corrosion Inhibition of Mild Steel with Tolyltriazole

“…As widely applicable organic corrosion inhibitors, azoles derivatives have various applications in the industries of copper [5][6][7][8] , aluminum [9][10][11] and their alloys with the exposure to corrosive medium. Azoles derivatives can be applied for a wide range of steels [12][13][14] in acidic or alkaline solutions along with chloride ions. Among the group of azole derivatives, Tolyltriazole (TTA, C 7 H 7 N 3 , with a chemical structure given in Figure 1 5 ) is the most widely used corrosion inhibitor for copper and copper alloys, in cooling water systems, because of its low cost and high performance in corrosion inhibition 5,7,[15][16][17][18][19][20][21][22] .…”

Electrobioremediation of Patagonian Soils Contaminated with Hydrocarbons

“…Weight loss measurements were performed using compounds of the dimensions (3 x 3 x 0.1) cm 3 . For galvanostatic polarization, a cylindrical rod embedded in araldite with exposed surface area of 0.2 cm 2 was used.…”

“…The use of inhibitors is one of the most practical methods for protection against corrosion especially in acid solutions to prevent metal dissolution and acid consumption [1]. Most well known acid inhibitors for steel corrosion are organic compounds containing [2][3][4][5][6][7][8][9][10]. It has been observed that most of the organic inhibitors act by adsorption on the metal surface [11].…”