Bimetal and Multimetal Galvanic Corrosion Prediction Using Long- and Short-Term Polarization Curves
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 volts/hour 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1984
- Accession Number
- ADA139893
Entities
People
- David W Taylor
- John R. Scully