Stimulating effect of phosphate ions on the dissolution kinetics of iron oxides in an acidic medium

Kuzin, A. V.; Горичев, И. Г.; Lainer, Yu. A.

doi:10.1134/s0036029513090073

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…Accordingly, in 2 M HClO 4 and 2 M HBr, the potentials of the platinum electrode are close to the reference values. Similar data on the decrease in the oxidative ability of the same 1 N acids, containing an equimolar mixture of Fe(III) and Fe(II), were reported in[16].…”

supporting

confidence: 81%

Effect of anionic composition of solutions of mineral acids containing Fe(III) on their oxidizing properties

Avdeev¹,

Andreeva²,

Panova³

et al. 2019

Int. J. Corros. Scale Inhib.

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Solutions of HClO 4 , HBr, H 2 SO 4 , HCl, H 3 PO 4 , HF and some of their mixtures containing Fe(III) and Fe(II) cations were studied at 20-95°C by potentiometry. The oxidizing ability of such solutions of individual acids decreases in the series: HClO 4  HBr  H 2 SO 4  HCl  H 3 PO 4  HF. This effect is the result of the enhancement in this series of the ability of anions of acids to bind Fe(III) cations into complex compounds that are less prone to reduction in comparison with its aqua complexes. To decrease the oxidative ability of acid solutions (HCl and H 2 SO 4 ) with a weak ability of anions to bind Fe(III) cations to complex compounds, it is possible to add acids (H 3 PO 4 or HF) that generate anions binding Fe(III) into stable and hardly reducible complexes. In the H 2 SO 4 -H 3 PO 4 -H 2 O, H 2 SO 4 -HF-H 2 O, HCl-H 3 PO 4 -H 2 O, and HCl-HF-H 2 O systems containing Fe(III) and Fe(II), the dependence of the redox potential of the Fe(III)/Fe(II) couple on the anionic composition of the medium showed that H 3 PO 4 is the most promising additive that reduces the oxidizing properties of HCl and H 2 SO 4 in solutions. In the HCl-H 3 PO 4 -H 2 O system taken as an example, the main regularities of changes in the oxidizing properties of two-component acid mixtures containing Fe(III) and Fe(II) are revealed. Variation in the total content of an equimolar Fe(III)+Fe(II) mixture (C = 0.01-0.10 M) in 1 M HCl + 1 M H 3 PO 4 nearly does not affect its oxidative ability. Conversely, an increase in the relative content of Fe(III) in the system considerably increases its oxidative potential. At a fixed concentration of the Fe(III) + Fe(II) mixture (0.04 M) in the HCl + H 3 PO 4 system, an increase in the concentration of these acids from 1 to 4 M slightly reduces the oxidative properties of the system. Improving the corrosion protection of steel in HCl or H 2 SO 4 solutions containing Fe(III) salts with a composite inhibitor (IFKhAN-92 + KNCS + hexamine) can be effective when H 3 PO 4 is added. This effect is largely determined by the binding of Fe(III) cations to phosphate complexes, which have a lower oxidizing capacity compared to its aqueous, sulfate and chloride complexes.

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supporting

confidence: 81%

Effect of anionic composition of solutions of mineral acids containing Fe(III) on their oxidizing properties

Avdeev¹,

Andreeva²,

Panova³

et al. 2019

Int. J. Corros. Scale Inhib.

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“…Among these, pyridinium is a class of heterocyclic cationic compounds that contain a six-membered ring with five carbon atoms and one nitrogen atom, and multiple ILs based on pyridinium have been considered as corrosion inhibitors of carbon steel in 1.0 M HCl solution. For example, one ionic liquid based on pyridinium (1-(3-bromopropyl)-4-(dimethylamino)pyridiniumbromide) was synthesized and characterized (using 1 H NMR and 13 C NMR and DEPT spectroscopies) by Aoun et al [176]. Next, they studied the adsorption and inhibition effect of the IL inhibitor on carbon steel in a 1.0 M HCl solution by WL, PDP, and EIS.…”

Section: Ionic Liquidsmentioning

confidence: 99%

“…The media used to study the corrosion inhibition ability of corrosion inhibitor in different literature were mainly 1.0 M HCl solution, which is primarily because most metal chlorides are easily soluble in water. The treatment of the rusty metal with HCl solution is capable of dissolving a wide range of corrosion products on metal, while the HCl solution is used for chemical cleaning processes as an acid detergent in which the concentration is exactly 1.0 M. Moreover, in carbon steel/HCl solution systems, the reaction rate of iron oxide with HCl is over three times faster than that of iron oxide with H 2 SO 4 , which is far more than that of iron oxide with HNO 3 , HClO 4 , citric acid, formic acid, and acetic acid [ 13 ]. Therefore, the use of efficient, safe, and low-cost HCl as an acid detergent is well recognized.…”

Section: Introductionmentioning

confidence: 99%

Organic Compounds as Corrosion Inhibitors for Carbon Steel in HCl Solution: A Comprehensive Review

Chen

Zhang

2022

Materials

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Most studies on the corrosion inhibition performance of organic molecules and (nano)materials were conducted within “carbon steel/1.0 M HCl” solution system using similar experimental and theoretical methods. As such, the numerous research findings in this system are sufficient to conduct comparative studies to select the best-suited inhibitor type that generally refers to a type of inhibitor with low concentration/high inhibition efficiency, nontoxic properties, and a simple and cost-economic synthesis process. Before data collection, to help readers have a clear understanding of some crucial elements for the evaluation of corrosion inhibition performance, we introduced the mainstay of corrosion inhibitors studies involved, including the corrosion and inhibition mechanism of carbon steel/HCl solution systems, evaluation methods of corrosion inhibition efficiency, adsorption isotherm models, adsorption thermodynamic parameters QC calculations, MD/MC simulations, and the main characterization techniques used. In the classification and statistical analysis section, organic compounds or (nano)materials as corrosion inhibitors were classified into six types according to their molecular structural characteristics, molecular size, and compound source, including drug molecules, ionic liquids, surfactants, plant extracts, polymers, and polymeric nanoparticles. We outlined the important conclusions obtained from recent literature and listed the evaluation methods, characterization techniques, and contrastable experimental data of these types of inhibitors when used for carbon steel corrosion in 1.0 M HCl solution. Finally, statistical analysis was only performed based on these data from carbon steel/1.0 M HCl solution system, from which some conclusions can contribute to reducing the workload of the acquisition of useful information and provide some reference directions for the development of new corrosion inhibitors.

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“…The phosphoric acid has a rust conversion function for generating a proper painting layer by reaction with iron oxides [29] and has a function for removing oxide scales on steel surfaces [30]. The safety of the phosphoric acid is higher than that of the hydrochloric acid, and the dissolution rate of the oxide scale of steel for the diluted phosphoric acid is higher than that for the diluted hydrochloric acid [31].…”

Section: Introductionmentioning

confidence: 99%

Dual-frequency ultrasonic cleaning with diluted phosphoric acid solution for removing oxide scale of uncoated steel sheets in hot stamping

Nakamura

Mori

Komatsu

et al. 2021

Int J Adv Manuf Technol

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Dual-frequency ultrasonic cleaning with a diluted phosphoric acid solution was developed to remove oxide scales on surfaces of hot-stamped parts from uncoated steel sheets, and conventional shot blasting processes are omitted. The removal of the oxide scale by ultrasonic cleaning is accelerated by the phosphoric acid solution and the dual frequency. The removing time for the phosphoric acid solution was shorter than that for a hydrochloric acid solution, and rust appearing for leaving after cleaning was prevented by generating an iron phosphate layer. In dual-frequency ultrasonic cleaning with the diluted phosphoric acid solution, the oxide scale was dissolved, and then the oxide scales were exfoliated from the thin scale and high-pressure portions. The removing time decreased with decreasing pH and oxide scale thickness and with increasing solution temperature. The surface roughness and distortion of an ultrasonic-cleaned hot-stamped part were smaller than those for shot blasting, and the weldability and paintability were similar. The oxide scale of a hot-stamped part having a nonuniform distribution of oxide scale thickness was successfully removed by dual-frequency ultrasonic cleaning with the diluted phosphoric acid solution.

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Stimulating effect of phosphate ions on the dissolution kinetics of iron oxides in an acidic medium

Cited by 12 publications

References 7 publications

Effect of anionic composition of solutions of mineral acids containing Fe(III) on their oxidizing properties

Effect of anionic composition of solutions of mineral acids containing Fe(III) on their oxidizing properties

Organic Compounds as Corrosion Inhibitors for Carbon Steel in HCl Solution: A Comprehensive Review

Dual-frequency ultrasonic cleaning with diluted phosphoric acid solution for removing oxide scale of uncoated steel sheets in hot stamping

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