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Title: In-situ process for the monitoring of localized pitting corrosion

Abstract

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.

Inventors:
; ; ;
Issue Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1531426
Patent Number(s):
5888374
Application Number:
08/855,707
Assignee:
The University of Chicago (Chicago, IL)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 1997-05-08
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pope, Daniel H., Lin, YuPo J., St. Martin, Edward J., and Frank, James R. In-situ process for the monitoring of localized pitting corrosion. United States: N. p., 1999. Web.
Pope, Daniel H., Lin, YuPo J., St. Martin, Edward J., & Frank, James R. In-situ process for the monitoring of localized pitting corrosion. United States.
Pope, Daniel H., Lin, YuPo J., St. Martin, Edward J., and Frank, James R. Tue . "In-situ process for the monitoring of localized pitting corrosion". United States. https://www.osti.gov/servlets/purl/1531426.
@article{osti_1531426,
title = {In-situ process for the monitoring of localized pitting corrosion},
author = {Pope, Daniel H. and Lin, YuPo J. and St. Martin, Edward J. and Frank, James R.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {3}
}

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