Nano-metal-organic frameworks as corrosion inhibitors for strengthening anti-corrosion behavior of carbon steel in a sulfuric acid environment: from synthesis to applications

In order to demonstrate the effect of Nano-metal organic frameworks, [Cu-2(CN)(4)(Ph3Sn) (Pyz2-caH)(2)] (NMOF1) and [(3)(infinity)[Cu(CN)(2)(Me3Sn)(Pyz)]] (NMOF2) as corrosion inhibitors for C-steel in 0.5 M sulfuric acid solutions, the following methods were utilized: mass reduction (MR), potentiodynamic polarization (PDP), and AC electrochemical impedance (EIS). The results of the experiments showed that by increasing the dose of these compounds, the inhibition efficacy (?%) of C-steel corrosion increased and reached 74.4-90% for NMOF2 and NMOF1 at a dose of 25 x 10(-6) M, respectively. On the other hand, the ?% decreased as the temperature range rose. Parameters for activation and adsorption were determined and discussed. Both NMOF2 and NMOF1 were physically adsorbed on the surface of C-steel and conformed to the Langmuir adsorption isotherm model. The PDP studies revealed that these compounds functioned as mixed type inhibitors, i.e. affecting both metal dissolution and hydrogen evolution reactions. Attenuated Total Reflection Infra-Red (ATR-IR) analysis was carried out to determine the morphology of the inhibited C-steel surface. There is good agreement between the findings of EIS, PDP and MR.

Automated summary

In this study, Nano-metal organic frameworks were used as corrosion inhibitors for C-steel in sulfuric acid solutions. The inhibition efficacy of C-steel corrosion increased with the dose of the compounds, reaching 74.4-90% at a dose of 25 x 10(-6) M. The inhibition efficacy decreased with higher temperatures. Activation and adsorption parameters were determined and discussed. Both compounds were physically adsorbed on the surface of C-steel and followed the Langmuir adsorption isotherm model. The compounds functioned as mixed type inhibitors, affecting both metal dissolution and hydrogen evolution reactions. Attenuated Total Reflection Infra-Red (ATR-IR) analysis showed the morphology of the inhibited C-steel surface. The findings of EIS, PDP, and MR were in good agreement.