Corrosion behavior of MgZnFeCuCo alloys in the presence of coumarin

Abstract Mg-11Zn-26Fe-7Cu-4Co, Mg-11Zn-6Fe-0.2Cu-0.3Co, and Mg-19Zn-17Fe-28Cu-18Co are produced by using a powder metallurgical process followed by sintering in an argon atmosphere. Potentiodynamic polarization and electrochemical impedance spectroscopy are applied to study the corrosion behavior and corrosion inhibition by coumarin of Mg-11Zn-26Fe-7Cu-4Co, Mg-11Zn-6Fe-0.2Cu-0.3Co, and Mg-19Zn-17Fe-28Cu-18Co in Hanks’ solution. Potentiodynamic polarization and electrochemical impedance spectroscopy characterization reveal that Mg-19Zn-17Fe-28Cu-18Co high entropy alloys exhibit better corrosion resistance than Mg-11Zn-26Fe-7Cu-4Co, and Mg-11Zn-6Fe-0.2Cu-0.3Co in Hanks’ solution. The addition of coumarin effectively inhibits corrosion of Mg-11Zn-26Fe-7Cu-4Co, Mg-11Zn-6Fe-0.2Cu-0.3Co, and Mg-19Zn-17Fe-28Cu-18Co high entropy alloys in Hanks’ solution.