Effects of the Chain Length of Tris(carboxyalkylamino)triazine on Corrosion Inhibition Properties

Abstract

The corrosion behavior of mild steel was studied in 1 M HCl solution containing varying amounts of triazine derivatives having amine groups and alkyl carboxylic acid groups. The synthesized triazine derivatives were characterized by Fourier transform infrared (FT-IR) spectroscopy, NMR, mass spectroscopy, and elemental analysis (EA), and their corrosion inhibition properties were determined by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. We found that the triazine derivatives acted as mixed-type inhibitors by their adsorption on the metal surface. We also proposed that the Langmuir adsorption isotherm model could be used to explain the adsorption of triazine derivatives. In addition, when the alkyl chain length of the triazine derivative was relatively long, we also obtained a high-adsorption equilibrium constant and low Gibbs free energy of adsorption. Thus, we conclude that the alkyl chain length plays an important role in the corrosion inhibition properties of triazine derivatives.

Natural Product-Derived Phosphonic Acids as Corrosion Inhibitors for Iron and Steel

“…For this purpose, our phosphonic acids were neutralized with triethanolamine (TEA, a standard alkaline additive for acidic corrosion inhibitors) in water or saline, and the protective effect was compared to commercial octylphosphonic acid ( OPA ) and 1,3,5-triazine-2,4,6-triaminocaproic acid ( TC ). The latter is a tricarboxylic acid used in many aqueous industrial MWFs, and is thus used as a benchmark corrosion inhibitor for iron and steel [ 44 ]. We are aware of the fact that MWFs are usually complex mixtures containing various additives (vide supra), which often have an additional impact on the overall performance of the MWFs in metal processing.…”

“…The tricarboxylic acid TC rapidly establishes a constant OCP, reflecting the fast formation of protective layers on steel. A mechanistic investigation of TC and close derivatives has, to the best of our knowledge, been performed in acidic media only, making extrapolation to alkaline systems difficult [ 44 ]. However, as a polar tricarboxylic acid derivative of heteroaromatic triazine, it most likely has complex adsorption properties on metal surfaces, with contributions from the carboxylic acids, amines and the heteroaromatic system.…”

Glucamines as green alternatives to conventional amino alcohols in metalworking fluids

“…Each amino alcohol was combined with the acidic corrosion inhibitor 1, a tricarboxylic acid, which is a powerful commercial corrosion inhibitor for application in hard water. [18,24] S235JR-steel slide coupons were used as test specimens. A summary of data derived from potentiodynamic polarization measurements is given in Table 1.…”

Ultrasound‐assisted synthesis of substituted triazines and their corrosion inhibition behavior on N80 steel/acid interface

“…The presence of lone pair of electrons on nitrogen atoms, π‐electron on the phenyl ring, is the important structural features through which they can easily adsorb on the metal surface and bring down corrosion. A few triazine derivatives have been reported as corrosion inhibitors . A perusal of literature shows that there is no report on the use of triazines as corrosion inhibitors for N80 steel in 15% HCl.…”