An eco-friendly green biopolymer blend for copper corrosion inhibition

Copper is a fascinating metal with wide applications since ancient time. Although Copper is resistant to certain environmental factors and several chemicals, aggressive medium could deteriorate the metal leading to its complete damage. The need for an eco-friendly corrosion inhibitor is much relevant in the present scenario. The inhibition efficiency of gum arabic (GA), sodium alginate (SA) and its blend is investigated using weight loss method, potentiodynamic polarization and electroscopic impedance spectroscopy (EIS) analysis in 1.0 M HCl solution. Higher inhibition efficiency is obtained at room temperature for the blend with 6666 ppm GA and 3333 ppm SA. The values of inhibition efficiency obtained are 88.8%, 80.5% and 86.2% using weight loss, potentiodynamic polarization and EIS analysis, respectively. The investigations are complemented by atomic force microscopy and field emission scanning electron microscopy which helped to analyze the physical adsorption of the biopolymer on the metal surface. The adsorption of the biopolymer on Copper obeyed Langmuir isotherm and inhibition efficiency has an inverse relation with temperature.

Automated summary

The inhibition efficiency of gum arabic, sodium alginate, and their blend was studied in a 1.0 M HCl solution. The blend showed higher inhibition efficiency at room temperature, and the values of inhibition efficiency were obtained using various analysis methods.