Apparatus for measuring the degree of sensitization of metal articles
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United States of America Patent
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Jan 14, 1986
Grant Date -
N/A
app pub date -
May 29, 1985
filing date -
Jun 1, 1984
priority date (Note) -
Expired
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Abstract
An apparatus for measuring the degree of sensitization of metal articles comprises an electrochemical cell in which the potential of a test-piece of the article with respect to a reference electrode is made to vary linearly with time by feeding currents of suitable intensity from the passivation field to the activation field by means of the counter-electrode; a pair of electrodes moves along the test-piece surface with the respective electrode ends kept equidistant and disposed along an axis substantially perpendicular to the test-piece surface, one of them being in contact with said surface; by measuring the potential difference of this pair of electrodes as a function of their position, the local degree of sensitization of the test-piece is obtained.
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