Electric Power Research Institute Incorporated

Sri International

Michael C McKubre

Barry C Syrett

Angel Sanjurjo

Marc D Hornbostel

Lawrence H Dubois

Steven Crouch-Baker

Francis Tanzella

Iouri I Balachov

Alexander S Lipilin

An electrochemical cell is provided which has a liquid anode. Preferably the liquid anode comprises molten salt and a fuel, which preferably has a significant elemental carbon content. The supply of fuel is preferably continuously replenished in the anode. Where the fuel contains or pyrolizes to elemental carbon, the reaction C+2O&#x2192;CO+4emay occur at the anode. The electrochemical cell preferably has a solid electrolyte, which may be yttrium stabilized zirconia (YSZ). The electrolyte is connected to a solid or liquid cathode, which is given a supply of an oxidizer such as air. An ion such as Opasses through the electrolyte. If Opasses through the electrolyte from the anode to the cathode, a possible reaction at the cathode may be O+4e&#x2192;2O. The electrochemical cell of the invention is preferably operated as a fuel cell, consuming fuel and producing electrical current.

Liquid anode electrochemical cell

A technique for electrochemical measurement of the corrosion current (corrosion rate) determines the electrochemical parameters that are necessary to calculate the corrosion rate as they are contained in the harmonic current response to a moderate amplitude sinusoidal voltage perturbation applied to the corroding metallic component. The harmonic current response is analyzed at frequencies .sub.1 f, .sub.2 f, .sub.3 f, .sub.4 f, .sub.5 f and the rectification current response of DC current to the presence of a 20-50 mV AC voltage perturbation at a frequency f. The free corrosion current density, the free corrosion potential and the Tafel coefficients are calculated. The Tafel coefficient or Tafel slope is a measure of the exponential dependence at the rate of corrosion in a material. From these data, the dissolution current is calculated, which in turn is integrated with respect to time to yield a cumulative mass loss.

Device for in situ monitoring of corrosion rates of polarized or

A method of monitoring the rate of corrosion of a cathodically protected system, comprising superimposing a sinusoidal voltage on a cathodic protection voltage imposed on a portion of the system, measuring an anodic dissolution current in response to the superimposed voltage, and calculating the corrosion rate from the anodic dissolution current at the cathodic protection voltage potential.

Device for in-situ monitoring of corrosion rate of cathodically

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Menlo Park, CA, United States of America

Michael C McKubre