Preparation and characterization of phosphate-nickel-titanium composite coatings obtained by sol–gel process for corrosion protection

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 TiO 2-NiO-P 2 O 5 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 57.5TiO 2-12.5NiO-30P 2 O 5 composite.

Tuning Brønsted and Lewis acidity on phosphated titanium dioxides for efficient conversion of glucose to 5-hydroxymethylfurfural

“…36,40 Several bands assignable to phosphoric acid were found including 2328 cm À1 (P-H vibration band), 1402 cm À1 (stretching vibration of the P] O), 1265 cm À1 (asymmetric stretching vibration of PO 2 À ), 910 cm À1 (stretch vibration of P-OH), and 526 cm À1 (PO 4 3À vibrational band). [41][42][43] The FTIR spectra of phosphate functionalized TiO 2 calcined at 600 C for 6 h are shown in Fig. 2b.…”

Effect of 6-Aminohexanoic Acid Released from Its Aluminum Tri-Polyphosphate Intercalate (ATP-6-AHA) on the Corrosion Protection Mechanism of Steel in 3.5% Sodium Chloride Solution

“…Degrad. 2021, 2, FOR PEER REVIEW 8 (~289 eV) (green and blue, Figure 5) correspond to carbon double-bonded oxygen C=O [23]. Moreover, the Na 1s spectrum could be fitted to one component at 1071.1 eV that is related to the presence of Na + -ions [24].…”

“…The peak observed at 286 eV(purple, Figure 5), known as single bonded carbon C-C, is generally related to the contaminants that are common in XPS analysis due to the hydrocarbons that are present in the environment [22]. However, the two peaks observed at higher energy (~289 eV) (green and blue, Figure 5) correspond to carbon double-bonded oxygen C=O [23]. Moreover, the Na 1s spectrum could be fitted to one component at 1071.1 eV that is related to the presence of Na + -ions [24].…”

“…The O-peak from 6-AHA is likely included in the OH peak at 532.5 eV, as the O 1s peak of organic molecules has been reported to appear at this energy level [25]. The C 1s spectrum contain three components overall: (a) 285.5 eV (brown, Figure 6) corresponding to the covalent C-C bond of the adsorbed organic molecule [25] and carbon adsorbed from contaminants [22]; (b) 286 eV (purple, Figure 6) associated with C-H bonds [26]; and (c) 288.9 eV (green and blue, Figure 6) for carbon double-bonded to oxygen C=O [22,23]. The P 2p spectrum of the protective film consists of a single component with a binding energy value of 133.41 eV.…”

Evaluation of Abrasive WearRate and Machining Behaviors of Synthesized Nitinol Composite

“…The continuous formation of surface has been developed through deposited layers. The homogeneous surface mainly depends on the number of layers formed among the alloying elements 24 . The composition of alloying elements with tungsten carbide has been validated through EDAX and the same is shown in Figure 2.…”