Corrosion protection of brasses and zinc in simulated urban rain. Part II. The combination of inhibitors benzotriazole and 2‐mercaptobenzimidazole with stearic acid

Abstract

Combinations of stearic acid (SA) and organic inhibitor benzotriazole (BTAH) or 2‐mercaptobenzimidazole (2‐MBI) were studied as corrosion inhibitors of brasses Cu10Zn and Cu40Zn and of Zn in simulated urban rain. In Part I, where self‐assembled layers of individual inhibitors (BTAH, 2‐MBI and SA) were studied, the SA layer performed best. Here the properties of layers were also tested with weight loss immersion tests, polarization measurements and electrochemical impedance spectroscopy measurements. Results of the weight loss immersion test, polarization measurements and electrochemical impedance spectroscopy measurement showed that combining organic inhibitor and stearic acid improves the corrosion protection properties of the self‐assembled layers. The contact angles of layers made with combinations of organic inhibitor and SA were higher than for individual SA layers.

Corrosion protection of brasses and zinc in simulated urban rain

“…Inhibitors were first used singly, as presented in this study (Part I), which represents the first part of the two-part article. In Part II the inhibitors were combined to possibly achieve better performance [42].…”

Contemporary Modes of Corrosion Protection and Functionalization of Materials

“…The combination of differ- ent inhibitors can either increase the effect of each inhibitor individually, or bring additional functional property, for examples hydrophobicity. 55,56,57,58,59,60,61 Illustrative example is the combination of classical inhibitors for copper and copper-based alloys-2-mercapto benzimidazole (SH-BimH 2 ) and benzotriazole (BTAH)-and carboxylic acids. 57,58,59,60,61 Immersion of metal in a solution containing carboxylic acid, especially those with long alkyl chain, results in the formation of carboxylate layer at the surface which contributes to hydrophobicity of the surface.…”

Benzimidazole and its derivatives as corrosion inhibitors for mild steel in hydrochloric acid

“…Benzimidazole (BI) and its derivatives were used to inhibit the corrosion of metals in a corrosive medium. [11][12][13][14][15][16][17][18] J. Aljourani et al 11 researched the BI, 2-methylbenzimidazole and 2-mercaptobenzimidazole as corro-sion inhibitors for mild steel in the 1M HCl solution; they found that these inhibitors retarded both the cathodic and anodic processes and that the inhibition efficiency was increased with an inhibitor concentration in the order of 2-mercaptobenzimidazole > 2-methylbenzimidazole > BI. Recently, P. Morales-Gil et al 19 found that the IE of 2-mercaptobenzimidazole for carbon steel in the 1M hydrochloric acid is 99 %, with a concentration of 2 mM.…”