Electrochemical prediction of corrosion susceptibility of zircon

Details Electrochemical prediction of corrosion susceptibility of zircon Electrochemical prediction of corrosion susceptibility of zircon

1982-03-01

1984-01-10

Weisstuch, Aaron

Chemistry: electrical and wave energy

Processes and products

204404, G01N 2746, G01N 2730

Patent

active

044251939

ABSTRACT:
An electrochemical apparatus and a testing procedure are described for predicting the susceptibility of certain zirconium-base alloys to nodular corrosion in boiling water reactor environments. A chemically polished pre-determined area of the surface of the zirconium-base alloy is made the anode in an electrochemical cell. A constant direct current (d-c) having an alternating current (a-c) superimposed thereon is applied to the cell and the quadrature component of the a-c cell voltage is monitored in order to measure the value of the depth of the minimum occurring in the quadrature component of the a-c cell voltage-versus-time relationship after a d-c cell voltage of at least eight volts has been reached. The application of a-c to the cell is stopped and the constant d-c previously applied is decreased by a a step-change to a constant value providing a reduction of at least one-half in the current density. The d-c cell voltage response to this step-change exhibits a transient decrease and the d-c cell voltage response as a function of time is monitored until the cell voltage again starts to rise in order that the magnitude of this transient can be measured. A constant d-c current is then re-applied to the cell and the degree of non-linearity occurring in the relationship between d-c cell voltage and time is measured. The magnitude of a minimum in the quadrature component of the a-c cell voltage, the magnitude of the transient in the d-c cell voltage response to the step-change in d-c current and the degree of non-linearity displayed in the relationship between d-c cell voltage and time (or some other parameter, which directly relates to time) are compared to standardized values and an assessment, or determination, of the corrosion susceptibility of the sample can be made based upon this comparison.

REFERENCES:
patent: 3486996 (1969-12-01), Annand
patent: 4238298 (1980-12-01), Tsuru et al.
patent: 4256542 (1981-03-01), Tytgat
J. Postlethwaite et al., "Electrochemical Flow Cell for Elevated Temperature/Pressure Aqueous Corrosion Studies", Corrosion Science, vol. 10, pp. 885-890, (1970).

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