Development and Characterization of bio-based PLA-PU-Garnet coatings towards Anti-corrosion

Although synthetic polymers offer excellent versatility in coating applications, due tointrinsic permeability to gases and vapours, including, but not limited to, oxygen, carbondioxide, and organic vapours, their application is highly limiting. On the other hand, somenatural polymers render great alternative to synthetic polymers in such areas of research. Inthis work, flexible polyurethane is used to make the PLA as flexible coating. Hence, ourpresent study is focussed on the development of PLA-PU hybrid organic polymer with theincorporation of garnet waste powder (in-organic) as coatings deposited by brush-coatingmethod on mild steel. To overcome the brittle nature of the PLA, a small amount ofpolyurethane having a rubbery nature is added along with garnet. The mechanical and barrierproperties significantly improved with the addition of a garnet (5%, 10%, and 15%) inPLA-PU blends. The various characterization techniques like Fourier Transform InfraredSpectroscopy (FTIR), Crosshatch test, contact angle, and morphological analysis by ScanningElectron Microscopy (SEM) and Electrochemical Impedance and Salt-spray and Cross-hatchadhesion tests are checked.