Nanostructured vanadium-based conversion treatment of mild steel substrate: formation process via noise measurement, surface analysis and anti-corrosion behavior

Abstract

The bath pH, vanadia solution concentration and immersion time were optimized for the chemical surface treatment of ST12 mild steel by vanadium-based conversion coating (VCC). Nano-sized vanadium oxide/hydroxide particles were found to form on the steel surface.

Investigation of the Effect of Nanosilica on Rheological, Thermal, Mechanical, Structural, and Piezoelectric Properties of Poly(vinylidene fluoride) Nanofibers Fabricated Using an Electrospinning Technique

“…The work of adhesion and the surface free energy data were calculated by the Young and Neumann (eqs and , respectively) equations. − In these equations, γlv and θ are water surface tension and water contact angle of the electrospun nanofibers, respectively. The values of γ lv and β are 72.8 mJ m –2 and 0.0001247 ± 0.000010 (mJ m –2 ) −2 , respectively . In the first step of the calculation, W a was obtained from eq , and afterward, the γ sv was computed by eq .…”

“…To investigate the effects of SiO 2 nanoparticles on the wettability, surface free energy (γ sv ), and work of adhesion ( W a ) of PVDF, contact angle measurements were performed on the surface of the neat and nanocomposite PVDF films. Values of the surface free energy and work of adhesion were quantified using Young and Neumann equations, respectively, based on a previous study by Motamedi et al . It should be noted that results of surface characterization obtained by the mentioned equations are valid just for the nonporous surfaces.…”

“…The values of γ lv and β are 72.8 mJ m −2 and 0.0001247 ± 0.000010 (mJ m −2 ) −2 , respectively. 55 In the first step of the calculation, W a was obtained from eq 5, and afterward, the γ sv was computed by eq 6. Results disclosed that the addition of SiO 2 caused an increase in the hydrophilicity or wettability of the PVDF films.…”

Modification and characterization of an Iranian montmorillonite as a corrosion/mechanical promoter for epoxy coatings

“…Furthermore, the values of total log |Z| 0.01 Hz of these samples were high, and their θ 100 kHz values (phase angle at high frequencies) were almost –90°, suggesting good barrier protection of these samples after a short immersion time. The log |Z| 0.01 Hz demonstrates the total resistance of the coating system because of almost direct current (DC) conditions at very low frequencies on the Bode plot (Haddadi et al , 2015; Motamedi & Attar, 2016; Mahmoodi & Ebrahimi, 2018). Moreover, the θ 100 kHz shows the tendency for current to pass from the capacitance or resistance elements of the coating.…”

Vanadium Pentoxide-Enwrapped Polydiphenylamine/Polyurethane Nanocomposite: High-Performance Anticorrosive Coating

“…Several reports are available on vanadium-based conversion coatings. Attar and Motamedi have optimized the chemical surface treatment of ST12 mild steel by using vanadium-based conversion coatings . Moreover, the ability of nanostructured V 2 O 5 for the processing of anti-biofouling ship-hull coatings has also been highlighted recently. , In this context, we have exploited the unique property of V 2 O 5 to design anticorrosive coatings.…”