Development of Flower Like Hierarchical Thiourea Loaded Titania–Poly Vinyl Alcohol Nano Composite Coatings for the Corrosion Protection of Mild Steel in Hydrochloric Acid

摘要: A stable, thiourea doped titania–poly vinyl alcohol (PVA) hybrid nanocomposite anticorrosion coating on mild steel has been developed via sol–gel dip-coating method. For comparative studies, bare titania is coated over and evaluated using electrochemical methods. To investigate structure morphology of coating, fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrometry (EDX), diffraction (XRD), UV absorbance spectra, atomic force (AFM) techniques were employed. Effect drying temperature samples at 100, 200 300 °C the corrosion protection nature was analysed. The dried 200 °C exhibit maximum ability. Thiourea 1, 1.4, 1.8 wt% incorporated into titania–PVA ability these coatings by weight loss, impedance spectroscopic studies (EIS), polarization measurement in 1 M HCl solution. FESEM shows that modifier PVA results cracked to a flower like hierarchical distribution all surface steel, AFM analysis revealed found be spiky with roughness root mean square (rms) value 0.33 µm better resistance M HCl study reveal there an optimum (1.8 wt%) loading for beneficial effects increase efficiency significantly (97%).This simple, facile eco-friendly method great potential replace environmentally hazardous chromate conversion coatings. Moreover modified metal offers attractive extending exposure period 70 days, which far superior conventional losses day day. protective layer consists compact PVA–titania rich molecules offering significant physical barrier against attack corrosive ions from acid