UFC 3-570-06
JANUARY 31 2003
Figure 7-30. Effect of pH on the Corrosion Rate of Steel
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EL ECT RO L YT E p H
7-12.1
Antimony Electrode Test Method
7-12.1.1 Antimony is a unique metal with the characteristic of a direct relationship
between pH and its measured potential. The potential difference or voltage developed
between antimony and a copper/copper sulfate reference electrode varies from
approximately 0.1 volts DC to 0.7 volts DC due to variations in the pH. Consequently, it
can be used to determine the pH of the electrolyte when used together with this
reference electrode.
7-12.1.2 The antimony electrode must be cleaned prior to use. As with the
copper/copper sulfate electrode, special cleaning procedures must be used. Clean the
antimony electrode as per instructions in 7.2.1.1a. Antimony is very brittle; treat it
carefully. The antimony tip must be kept smooth, and there must be no rough surface
or pits.
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