Characterization of self‐assembled layers made with stearic acid, benzotriazole, or 2‐mercaptobenzimidazole on surface of copper for corrosion protection in simulated urban rain

Abstract

Two procedures (one‐step and two‐steps) of combining stearic acid and corrosion inhibitor (1H‐benzotriazole or 2‐mercaptobenzimidazole) to produce self‐assembled layers on surface of copper to protect it against corrosion in simulated urban rain were studied. The contact angle measurements showed that surfaces of layers made with combination of stearic acid and 2‐mercaptobenzimidazole or 1H‐benzotriazole and layers only made with stearic acid were hydrophobic. Energy dispersive X‐ray spectroscopy and glow discharge optical emission spectroscopy analyses clearly highlighted that both stearic acid and organic inhibitors are involved in the protective film formation. Potentiodynamic curves confirm that one‐step combinations (self‐assembling in a mixture of stearic acid and inhibitor) exhibit better protection compared to layers made with individual inhibitors only and compared to two‐steps procedure (self‐assembling by successive immersion in inhibitor and stearic acid), regardless the type of inhibitor employed. Fast process of self‐assembling under optimal conditions produces thin, hydrophobic protective layers on copper suitable for use under conditions of atmospheric corrosion. The tests in spray chamber show that the corrosion protection of Cu is provided after long‐term exposure to simulated urban rain.

Electrochemical, Surface-Analytical, and Computational DFT Study of Alkaline Etched Aluminum Modified by Carboxylic Acids for Corrosion Protection and Hydrophobicity

“…27 Furthermore, stearic (octadecanoic) acid, being the most efficient among the investigated CAs, was also combined with benzotriazole and 2-mercaptobenzotriazole to produce mixed inhibitor layers showing both corrosion resistance and hydrophobicity. [28][29][30][31] Myristic (tetradecanoic) acid was also tested as a promising treatment for protection of copper and bronze artefacts. 32,33 Long-chain CAs have been previously used in other studies to fabricate corrosion resistant and/or hydrophobic surfaces on different metals such as Cu, 34 Mg, 35 and Zn.…”

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.…”

Bronz Yapıtların Atmosferik Korozyonunda Hava Kirleticilerin Etkisi ve İnhibitörle Korunması

“…Makroyapı tamamen homojen ve kusursuz görünmesine rağmen, 20.000 büyütme ile mikro yapıda kusurların görünmesi, moleküler arası etkileşmelerin ve metal yüzeyine tutunmayı sağlayan adhezyon kuvvetlerine bağlı ortaya çıkan olağan bir durumdur. Hem ME hem de AET, sahip oldukları -SH grubu üzerinden metal atomların (özellikle bakır) boş d orbitalleri ile koordinasyona girerek, yüzeyde polimer benzeri çok ince bir film oluşturabilirler [20]. Ancak, AET sahip olduğu amin grubu elde edilen polimerik ince filmlerin morfolojisi üzerinde önemli fark yaratmaktadır.…”