Kinetics of the reaction of hydrogen evolution on steel in a hydrochloric acid solution containing corrosion inhibitors

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The kinetics of cathodic reduction of hydrogen on low-carbon steel in 2 M HCl (t = 25 °C) containing corrosion inhibitors – catamine AB and IFKhAN-92 – was studied. The main rate constants for the stages of hydrogen gas evolution and the introduction of hydrogen atoms into steel are determined. The additions of catamine AB and IFKhAN-92 inhibited the cathodic reduction of hydrogen and its permeation into steel in an HCl solution. The most effective inhibitor of hydrogen absorption is IFKhAN-92. The inhibitory effect of this compound is due to a decrease in the ratio of the hydrogen concentration in the metal phase to the degree of hydrogen filling of the surface. IFKhAN-92 reduction of hydrogen concentration in the volume of metal determines the preservation of the plastic properties of steels during corrosion in HCl solutions. The high efficiency of IFKhAN-92, as an inhibitor of cathodic reduction of hydrogen and its absorption, is the result of chemisorption of this compound on the surface of the steel and the formation of a polymolecular protective layer.

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Ya. Avdeev

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

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Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

T. Nenasheva

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

A. Luchkin

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

A. Panova

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

A. Marshakov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

Yu. Kuznetsov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: avdeevavdeev@mail.ru
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Cathodic polarization curves on steel (a) and potential dependence of hydrogen introduction rate (b) in 2 m hcl solution containing 5 mm ir.

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3. Fig. 2. Polarization curves on high-strength steel in 2 M HCl solution (1) with 5 mM AB catamine (2) and IFCHAN-92 (3) additives.

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4. Fig. 3. Equivalent electrical diagram and Nyquist diagrams of steel electrode in 2 M HCl solution (1), taken after introduction of 0.01 mM IFCHAN-92 into the solution with exposure time (min): 2 - 5, 3 - 15, 4 - 60, 5 - 120, 6 - 180.

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5. Fig. 4. Adsorption isotherm of IFCHAN-92 on steel (E = -0.30 B) in 2 M HCl solution.

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6. Fig. 5. Standard RFE electron spectrum of Fe(2p) surface of steel (spin orbital splitting - duplet), after pre-adsorption of the inhibitor with 2 M HCl + 5 mM IFCHAN-92 for 24 h.

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7. Fig. 6. XRD electron O(1s) spectra of the steel surface after pre-adsorption of the inhibitor 2 M HCl + + + 5 mM IFCHAN-92 for 24 h.

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8. Fig. 7. RFE spectra of N(1s) electrons of steel surface after preliminary adsorption of inhibitor 2 M HCl + 5 mM IFCHAN-92 for 24 h followed by washing in an ultrasonic bath.

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