Unused Augmentin Drug as save corrosion inhibitor for α-brass in Nitric acid solution

Abstract

Unused Augmentin was investigated as save corrosion inhibitor for α-brass in nitric acid solution by different monitoring techniques. The results showed the variation in inhibition performance of the drug with varying concentrations and temperatures. The maximum efficiency was found to be 93.6 % at 300 ppm concentration of the drug for the immersion period of 3 hours at 40C. Temkin was tested to describe the adsorption behavior of the drug on α-brass surface. Potentiodynamic polarization study clearly revealed that this drug acts as mixed type inhibitor. The results of the electrochemical impedance study showed a decrease in double layer capacitance and increase in charge transfer resistance. Chemical adsorption mechanism is proposed from the calculated thermodynamic parameters for the studied drug. The results of various techniques showed good agreements with each other.

Keywords

• corrosion inhibition
• α-brass
• unused augmentin
• temkin isotherm
• hno3