Marine Corrosion Studies: The Effects of Dissimilar Metal Couples and Toxicants from Antifouling Paints on the Corrosion of 5086 and 6061 Aluminum Alloys and Their Response to Cathodic Protection
Abstract
Aluminum alloy 5086-H32 when not coupled to dissimilar metals was observed to be corrosion resistant in seawater or in the Potomac River at Washington, D.C. Severe corrosion occurred in seawater however when coupled to any of the following dissimilar metals: copper nickel, 10%; yellow brass; 304 stainless steel; or mild steel. This galvanic corrosion could not be completely prevented by cathodic protection. A magnesium anode also caused severe corrosion of the aluminum in seawater. Aluminum alloy 6061-T6 was severely corroded when continuously immersed in quiescent seawater or in the Potomac River. In seawater corrosion caused by the cuprous oxide toxicant was not as severe as that observed on uncoated and unprotected 6061-T6 aluminum, but in the Potomac River the depth of corrosion was significantly increased by the cuprous oxide antifouling coating.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1972
- Accession Number
- AD0746099
Entities
People
- J. A. Smith
- M. H. Peterson
- R. E. Groover
- T. J. Lennox Jr.
Organizations
- United States Naval Research Laboratory