Max R Yaffe

US Patent:

60154845, Jan 18, 2000

Filed:

Nov 26, 1997

Appl. No.:

8/978837

Inventors:

Gregory A. Martinchek - Langhorne PA
Max R. Yaffe - Maple Glen PA

Assignee:

Gamry Instruments, Inc. - Warminster PA

International Classification:

G01N 2726

US Classification:

2057755

Abstract:

Apparatus and methods for monitoring localized or pitting corrosion of metal or other material are described. A probe having a working electrode made of the same material as the material being monitored is located in the same corroding environment as the material being monitored. The electrochemical noise detected between the working electrode and other electrodes is processed to provide an indication of the state of localized corrosion of the material being monitored. An anodic bias voltage is applied to the working electrode. This bias voltage accentuates localized corrosion at the working electrode, improving sensitivity and permitting more accurate evaluation of the electrochemical noise signals.