The University of Chicago

James R Frank

YuPo J Lin

Edward J St Martin

Daniel H Pope

Robert W Peters

Xiandong Feng

An electrode design is provided for corrosion monitoring using electrochemical noise measurements. Electrochemical probes are used for sensing electrochemical noise voltage values and electrochemical noise current values. The electrochemical probes include a pair of working electrodes formed of the same material of the monitored metal pipes or storage vessels and a reference electrode formed of a corrosion resistant material. Each of the pair of working electrodes has a defined surface roughness. One of the pair of working electrodes has reduced roughness, whereby sensitivity to sustained localized pitting corrosion is increased in the working electrode with reduced roughness. By reducing the surface roughness of one of the pair of working electrodes, increased sensitivity to sustained localized pitting corrosion is provided while the current noise can be used to accurately measure the general corrosion rate on the unpolished electrode.

Electrode design for corrosion monitoring using electrochemical noise measurements

A method and apparatus are provided for monitoring localized pitting corrosion in metal pipes or storage vessels. Electrochemical probes are used for sensing electrochemical noise voltage values and electrochemical noise current values. The root-mean-square electrochemical noise current and voltage values are calculated and stored for the sensed electrochemical noise voltage values and the electrochemical noise current values. The stored electrochemical noise current and voltage values are processed by transforming the stored electrochemical noise current and voltage values into power spectral density data utilizing a fast Fourier transform. A slope of the power spectral density data relative to frequency is calculated. The electrochemical probes include a pair of working electrodes formed of the same material of the monitored metal pipes or storage vessels and a reference electrode formed of a corrosion resistant material. A linear slope of a low-frequency portion of the power spectral density data is calculated by using a least-square method.

In-situ process for the monitoring of localized pitting corrosion

An in situ method for extraction of arsenic contaminants from a soil medium and remediation of the medium including contacting the medium with an extractant solution, directing the solution within and through the medium, and collecting the solution and contaminants. The method can also be used for arsenate and/or arsenite removal.

Growing community of inventors

Glen Ellyn, IL, United States of America

James R Frank