Insight into the microstructural characteristics and corrosion properties of AZ31 Mg alloy coated with polyurethane containing nanostructures of copper metal organic frameworks

Abstract

Herein, the polyurethane (PU) polymer containing of copper metal–organic frameworks (Cu-MOFs) nanostructures coated on magnesium alloy (Mg AZ31) substrates (AZ/Cu-MOFs/PU) was prepared by using simple dip-coating method. Then, different characterizations were performed to determine the composition, morphology, structure, and wettability of the coatings. The compact PU coatings progress the anti-corrosion effect due to the functional groups of surfaces. Based on the electro-chemical tests, prepared coating has superior corrosion behavior compared to bare sample (AZ31). The dense and compact polymer containing Cu-MOFs coatings prevents the penetration of destructive ions to the surface of AZ31 alloy, which leads to the inhibition effect and improved corrosion behavior.