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July/August 2009

Electrochemical Noise Measurement

James Thomas at Tsinghua University, China

Example of pitting corrosion in drilling equipment.

Localized corrosion, such as pitting, cracking or crevice corrosion, can be destructive to process equipment, but if it is detected early enough, potential damage can be minimized or avoided.

A new ASTM International standard provides a means for electrochemical testing for corrosion. The new standard, G199, Guide for Electrochemical Noise Measurement, was developed by Subcommittee G01.11 on Electrochemical Measurements in Corrosion Testing, part of Committee G01 on Corrosion of Metals.

According to Dawn Eden, a specialist in corrosion solutions with Honeywell Process Solutions, and a G01 member, G199 will serve multiple purposes.

“Aside from the procedure for making electrochemical noise measurements for the detection of general and localized forms of corrosion, the guide provides a number of methods for analyzing the resulting data,” says Eden. “This will be particularly helpful to new users since many data analysis methods have been applied to electrochemical noise over its almost 30-year history, and the brief overview has been assembled with input from many experienced users.”

Eden notes that G199 is primarily geared toward laboratory-based users with an interest in localized corrosion, although it could also be applied to some in-service applications, depending on the certified hazardous area classification of the equipment used.

Subcommittee G01.11 plans to continue its work in the area of electrochemical measurements. Eden says that, while G199 is a guide, there is a great opportunity for interested parties to work toward a test method or practice that includes data recorded from specific cases of localized corrosion, as well as its analysis.

“Active participation in new standards development would be welcomed from all quarters, ideally covering a broad spectrum of application experience in both laboratory and in-service studies,” says Eden.

Sankara Papavinasam, senior research scientist, CANMET Materials Technology Laboratory, and chair of Subcommittee G01.11, says that the subcommittee has developed 17 standards on electrochemical techniques for corrosion measurement and monitoring.

In addition, the subcommittee regularly organizes a symposium to review advancements in electrochemical techniques for corrosion equipment. A special technical publication containing the most recent symposium papers will be published this summer.


Technical Information: Dawn Eden, Honeywell International, Houston, Texas

Phone: 281-444-2282, ext. 31

Sankara Papavinasam, CANMET Materials Technology Laboratory, Ottawa, Ontario, Canada

Phone: 613-947-3603

ASTM Staff: Kevin Shanahan

Phone: 610-832-9737