Corrosion Inhibition Performance of Nitrogen-Containing Metal Organic Framework Compounds on Copper Flakes in Dilute HCl Medium

In this paper, a small molecular complex {[Cu(2,3-Hpyza)] center dot 2(H2O)} (compound1) was synthesized by solvothermal method from pyrazine dicarboxylic acid and Cu(H3COOH)(2)center dot H2O. A metal organic framework (MOF) compound {[Nd-2(2,3-Hpyza)(3)] center dot 4(H2O)}(n)(compound2) was synthesized by solvothermal method from pyrazine dicarboxylic acid and Nd(NO3)(3)center dot nH(2)O. Weight loss method, electrochemical measurement technique, and scanning electron microscopy technique were used to study the corrosion inhibition behavior of compound2and compound1on copper in 1 mol L-1HCl. At 25 degrees C, compound1and2had the highest corrosion inhibition rate of copper was 91.4% and 87.5% with concentration of 0.5 mmol L-1, respectively. The corrosion inhibition performance of compound2was better than compound1on copper corrosion. Both compound1and compound2were adsorbed on the surface of the copper, and accorded with the Langmuir isotherm adsorption equation.