On the theory of the coulostatic pulse technique as applied to redox electrodes with two consecutive charge transfer steps

Kopistko, O.A.; Наурызбаев, М. К.

doi:10.1016/s0022-0728(97)00568-8

Cited by 2 publications

(1 citation statement)

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“…Since then, the practical application of coulostatic measurements has been progressively extended from the ideal conditions of its early derivation to more and more complex systems. [10][11][12][13][14][15][16][17][18][19][20][21][22] In this method, a known small amount of charge is instantaneously applied to a working electrode in the equilibrium state then the overpotential decay curve is recorded for analysis. This method has some advantages in the study of electrode processes because there is no current between the working and reference electrodes while recording the overpotential decay curve and the electrical double layer capacitance can be determined.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Rapid evaluation of corrosion inhibitors in acidic solution using the coulostatic method

Yong-Tao¹,

Guo²,

Dong³

2004

Corrosion Engineering, Science and Technology

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A monitoring method for the corrosion rate of metal based on the coulostatic principle and a new mathematical model for the evaluation of Tafel coefficients from coulostatic experimental data are presented in this paper. Different kinds of equivalent circuit models involving R(CR(RL)) and R(RC) have been applied to examine the characteristics of the response curves to coulostatic and AC perturbations. In addition, weight loss and electrochemical impedance spectroscopy (EIS) experiments on Q235 mild steel in 0 . 5 M H 2 SO 4 solutions with and without thiourea as inhibitor have been used to verify the results from the coulostatic method. It was found that the coulostatic technique can not only determine values of R p and C d quickly, but also the Tafel coefficients in the acidic solution with and without inhibitor. Moreover, since coulostatic measurements can always assume R p equal to R t in this system, the corrosion rate calculated by the coulostatic method is free of confusion between R p and R t . This facilitates the rapid calculation of corrosion current density based on the Geary-Stern equation, and provides a simple procedure for the evaluation of corrosion and corrosion inhibitors.CEST/2143

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