Abstract
New phosphorus–titanium–nickel composites were deposited on steel substrate by using sol gel spin coating technique for application as anticorrosion coatings. Along with the synthesis, the effects of annealing temperature and various number of coating layers on anticorrosion properties were looked into. The corrosion behavior of deposited and annealed coatings was evaluated by salt spray testing in a neutral mist (ASTM B117-85 NSS) of 5% NaCl at 35 °C for 300 h. Titanium tetra-isopropoxide, tri-methyl phosphate and Nickel (II) nitrate hexahydrate were used as precursors. To characterize the coatings and powder various techniques were used: Thermogravimetric Analysis coupled to Differential Scanning Calorimetry, Fourier Transform Infrared Spectroscopy, X-Ray Diffraction, Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX) analysis, Elemental Analysis ICP and X-ray photoelectron spectroscopy (XPS). The microstructure and elemental identification were done by SEM with EDX and XPS analysis. XPS analysis confirmed that Ti, Ni, P, and O elements are present in the surface. The functional groups were identified by FTIR analysis. Finally, steel plates coated with TiO2–NiO–P2O5 composite displayed satisfactory anticorrosion properties under simulated seawater environment. The results of the study revealed that the annealing temperature at 450 °C and after six layers had a great impact on the anticorrosion properties of 57.5TiO2–12.5NiO–30P2O5 composite.
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