Appeal No. 2003-0346
Application No. 09/113,925
(b) an impedance measuring instrument in
electrical contact with the electrode.
47. An apparatus for detecting corrosion in an
electronically conducting metal substrate comprising:
(a) a housing having an open end portion;
(b) a solid polymer electrolyte membrane coupled
over the open end portion of the housing and
having a first exposed surface adapted to be
positionable in contact with a surface of the
substrate;
(c) an electrode disposed in the housing and in
electrochemical communication with a second
surface of the solid polymer electrolyte membrane;
and
(d) a voltage source having a first terminal in
electronic communication with the electrode and a
second terminal in electronic communication with
the substrate for providing an AC source voltage
at a selected frequency.
51. An apparatus for detecting corrosion in an
electronically conducting metal substrate comprising:
(a) a housing having an open end portion;
(b) a solid polymer electrolyte membrane coupled
over the open end portion of the housing and
having a first exposed surface adapted to be
positionable in contact with a surface of the
substrate; and
(c) an electrode disposed in the housing and in
electrochemical communication with a second
surface of the solid polymer electrolyte membrane,
wherein the first surface of the membrane is free
from electrodes.
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