Corrosion Inhibition of Aluminum in Hydrochloric Acid Solution Using Potassium Iodate Inhibitor

Abstract

Abstract:The inhibition effect of potassium iodate on the corrosion of aluminum in 2M HCl has been studied by weight loss, polarization and electrochemical impedance spectroscopy (EIS) measurements. It has been found that KIO 3 acts as an excellent inhibitor. Inhibition efficiency with 100 ppm inhibitor was very high. Polarization curves reveal that the used inhibitor is a mixed type inhibitor. The surface adsorption of KIO 3 leads to a decrease of double layer capacitance as well as an increase of polarization resistance. The adsorption of the inhibitor on the aluminum surface is in agreement with Temkin adsorption isotherm.

The Corrosion Inhibition Effect of Triazinedithiol Inhibitors for Aluminum Alloy in a 1 M HCl Solution

“…The inductive loop is generally attributed to the relaxation process in the oxide film covered on metal surface [26]. The reasons behind the deviations from perfect semicircles are usually involved with the frequency dispersion of interfacial impedance, which can be attributed to various kinds of physical phenomena such as active sites, surface roughness, and non-homogeneity of the solids [27]. The diameter of the capacitive loop is enlarging gradually with increasing concentrations of inhibitor, indicating that the charge transfer resistance is increased and the adsorbed inhibitor forms a more compact monolayer on metal surface with an increasing amount of inhibitor.…”

Evaluation of pawpaw leaves extract as anti-corrosion agent for aluminium in hydrochloric acid medium

“…They are used as reaction vessels, pipes, machinery and chemical batteries because of their advantages; low cost, lightness and good corrosion resistance at moderate temperatures [1,2,3]. It has been reported that passive oxide film formed on aluminium surface is responsible for its resistance to corrosion, but the surface film is amphoteric and dissolves substantially when the metal is exposed to high concentrations of acids or basses [2,4]. Aluminium dissolves readily in hydrochloric acid to form aluminium chloride and hydrogen.…”

“…Synthetic chemical substances have been used for the corrosion inhibition of aluminium in corrosive media. The inhibition effect of potassium iodate on the corrosion of aluminium in HCl has been reported [2]. Weight loss, polarization and impedance spectroscopy techniques were employed in the study.…”

Corrosion Inhibition of Aluminium in HCl by Amine Modified Epoxy Resin

“…Several authors have reported good correlation between this technique and gasometric, impedance, and polarisation techniques [16][17][18][19][20]. The corrosion rate of aluminium in HCl at 60 ∘ C ( Figure 2) increased at a rate which decreased with exposure time and was maximum at 8.6 × 10 −2 mm/yr at 10 hours.…”

“…For the calculation of corrosion rates, the relationship in (1) as described by Jones [1] and other authors [15][16][17] was employed CR = 87.6Δwt…”