Accession Number:

ADA139893

Title:

Bimetal and Multimetal Galvanic Corrosion Prediction Using Long- and Short-Term Polarization Curves

Descriptive Note:

Research and development rept.

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD SHIP MATERIALS ENGINEERING DEPT

Personal Author(s):

Report Date:

1984-02-01

Pagination or Media Count:

71.0

Abstract:

Long-term potentiostatic polarization curves of up to 120-days duration were developed for the following materials 90-10 copper-nickel Monel 400 Inconel 625 Navy M-bronze nickel-aluminum-bronze and HY-80 steel. In addition, potentiostatic polarization curves have been developed for Titanium- 50, 70-30 copper-nickel, and anode grade zinc. Also, short-term potentiodynamic polarization curves were developed at four scan rates and two pre-exposure levels on specimens of all but the last three of the above materials. The scan rates utilized ranged from 0.5 to 100 voltshour and pre-exposure times were 1 hour and 120 days. Long-term potentiostatic data was used to predict the behavior of actual two and three metal couples. The predictions had a level of accuracy equal to, or superior than, the conventional galvanic corrosion prediction techniques utilizing galvanic corrosion rate tables or corrosion potential differences. Potentiodynamic data from 120-day pre-exposed, low scan rate tests has demonstrated some utility in predicting bimetal couple behavior.

Subject Categories:

  • Properties of Metals and Alloys
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE