New imidazole‐based dimers as potential inhibitors for mild steel corrosion in acidic media: Electrochemical and DFT evaluation

Abstract

We report the synthesis and corrosion inhibition performance of two imidazole‐based materials, 1,1′‐(4‐methyl‐1,3‐phenylene)bis(3‐(3‐(1H‐imidazol‐1‐yl)propyl)urea) (PIP) and 1,1′‐(hexane‐1,6‐diyl)bis(3‐(3‐(1 H‐imidazol‐1‐yl)propyl)urea) (HIP) dimers, in 1.0 M HCl. Electrochemical assessments indicated that the synthesized dimers facilitated the formation of a protective layer at the metal‐electrolyte interface and, as a result, blocked the active corrosion sites. At a concentration of 100 ppm, PIP behaved as a potential mixed‐type anticorrosive material with an overall efficiency of 99%. Density functional theory calculations showed that the aromaticity existing in the PIP backbone plays a major role in facilitating the corrosion‐inhibition role.

Comparative study on two imidazolium‐based ionic liquid surfactants as corrosion inhibitors for N80 steel in 15% hydrochloric acid solution

“…[39] As exhibited in Table 1, all corrosion potential (E corr ) values do not considerably change and only slightly shift to more negative values after adding either [DDMIM]Cl or [BDMIM]Cl, which suggests that both inhibitors are representative mixed-type inhibitors and may simultaneously restrain anodic steel dissolution and cathodic hydrogen evolution only by simple adsorption on the steel surface. [40,41] As shown in Figure 2 and Table 1, after the addition of either [DDMIM]Cl or [BDMIM]Cl, the current density decreases, and the corrosion inhibition efficiency increases with an increase in the inhibitor concentration. However, the appropriate concentration ranges of the two inhibitors vary, and the concentration ranges of [DDMIM]Cl and [BDMIM]Cl are 0.1-1 mM and 0.005-0.1 mM, respectively.…”

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

“…As a consequence, the industrial sector is following the trend to not only look for efficient and stable CIs but also to pay attention to environmental aspects. [11][12][13] Organic compounds exhibiting functional groups with nitrogen, sulfur, oxygen and phosphorus heteroatoms, and/or π-electron, [11,[14][15][16] may facilitate their chemisorption and/or physisorption on metallic surfaces creating a protective barrier; thus, such compounds have been investigated as potential inhibitors for various metals in different environments, mainly in acidic solutions.…”

Técnicas experimentais e teóricas aplicadas ao estudo de inibidores orgânicos de corrosão em meio ácido

“…Em recente publicação foi relatado um estudo teórico e experimental de formas diméricas de imidazol (Abdulazeez, Al-Hamouz, Khaled, & Al-Saadi, 2020). Os estudos teóricos mostraram que a presença do anel aromático na estrutura 1,1'-(4-metil-1,3-fenileno)bis(3-(3-(1H-imidazol-1-il)propil)ureia) facilita seu papel anticorrosivo.…”