Improvement of Anti‐Corrosion Performance of a Cu‐Ni Bimetallic Organic Framework Smart Coating Using Amino‐Substitution Triazole

Abstract

AbstractIn this study, a smart pH‐sensitive anti‐corrosion coating was fabricated by encapsulating 3‐amino‐1H‐1,2,4‐triazole (3‐AT) as a corrosion inhibitor in a copper‐nickel bimetallic organic framework (BMOF). The corrosion process of the coating was investigated in a corrosive solution of 3.5 wt% NaCl using potentiodynamic polarization (Tafel) plots and electrochemical impedance spectroscopy (EIS). The synthesized 3‐AT@Cu‐Ni‐BTC BMOF has a loading capacity of 20.8 % for 3‐AT. 3‐AT encapsulated in BMOF is released as the corrosion zone becomes acidic and it serves as a corrosion inhibitor. The sensitivity of this coating to pH has been confirmed by the UV‐Vis method. The released 3‐AT inhibitor has an efficiency of 62.5 % to protect stainless steel against corrosion in the corrosive solution with reducing of optimal dosage by a factor of 4. The equivalent concentration of the released inhibitor is less than 1.25×10−3 M after 1 hour. As found in this study, the consumption of the corrosion inhibitor can be significantly decreased in a 3.5 wt% NaCl solution with the pH‐sensitive feature of the 3‐AT@Cu‐Ni‐BTC BMOF smart coating.