Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

Abstract

The corrosion inhibition of nanoparticulates zinc ferrite (NZF) pigment was studied. The steel samples were immersed in the NZF pigment extract in 3.5 wt. % NaCl. Electrochemical tests such as electrochemical impedance spectroscopy (EIS) and polarization as well as surface analysis were employed to evaluate the effect of NZF on the steel corrosion. The concentration of Zn and Fe in the pigment extracts before and after immersion of mild steel samples was evaluated by inductively coupled plasma-optical emission spectrometry (ICP-OES). EIS results in total agreement with results of polarization test demonstrated superiority of NZF as an anticorrosion pigment. In the case of samples exposed to NZF extract, the higher resistance and lower double layer capacitance extracted from impedance spectra as well as lower current density from polarization results might be attributed to precipitation of an inhibitive layer on the surface. This was also supported by SEM/EDS and ICP-OES results.

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe2O4/NiO nanocomposites

“…Among different ferrite materials, zinc ferrites (ZnFe 2 O 4 ), belonging to the spinel ferrite family, are a class of semiconductors characterized by a narrow bandgap, excellent visible light response, magnetic loss capability with a moderate saturation magnetization, enhanced mechanical hardness, and superior chemical and thermal stability [2,3]. Furthermore, ZnFe 2 O 4 NPs are practically used in vast areas such as corrosion inhibitor [4], photocatalysis [5], gas sensors [6], magnetic resonance imaging (MRI) [7,8], and drug delivery technology [9]. However, the high recombination rate of the photo-generated electrons and holes lowers its photocatalytic activity [10].…”

“…4 . Recently, a similar behavior was observed by Aridi et al[39] for ZnFe 2 O 4 /Mn 2 O 3 NCs and Varpe et al[40] for…”

Complex oxides – non-toxic pigments for anticorrosive coatings

“…The best protective performances have been found for the following binder/ferrite pigment combinations: organically diluted epoxy estera pigment with needle-shaped particle form (on goethite basis), water soluble epoxy oligomer pigment with isometric particle shape (on magnetite basis) and water dispersion styrene acrylate dispersionpigment with lamellar particle shape (on specularite basis). It was found out that not only the shape, but also the particle size of ferritic pigments influences significantly their anticorrosive efficiency (Mahvidi et al, 2017). The results electrochemical evaluation methods of steel corrosion in contact with nanoscale zinc ferrite extract in aqueous (3.5 Wt.%) NaCl solution allowed to make a conclusion about the passivation increase the of the substrate surface with a decrease in pigment dispersion inhibitory ability.…”

Zinc ferrite/polyaniline composite particles: Pigment applicable as electro-active paint

“…However, the chromate modification was eventually discovered to be toxic and the phosphate variation, although showing satisfying results, has not surpassed the chromium protection performance [3]. According to certain studies, zinc ferrites (ZF) seem to offer a satisfying alternative [4,5], especially in a nano-sized form [6,7]. Other studies include a combination of ZF and conductive polymers which also present an attractive direction for further studies.…”