Accession Number:

ADA096865

Title:

Mechanisms of Corrosion of Copper-Nickel Alloys in Sulfide-Polluted Seawater

Descriptive Note:

Final rept. 1 Feb 77-Feb 81

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Personal Author(s):

• Eiselstein, L. E.
• Caligiuri, R. D.
• Wing, S. S.
• Syrett, B. C.

Report Date:

1981-02-01

Pagination or Media Count:

71.0

Abstract:

We have investigated the importance and effects of various variables on the corrosion mechanism of two coppernickel alloys, CA706 90Cu-10Ni and CA715 70Cu-30Ni in seawater. The variables investigated were dissolved oxygen content, sulfide content, pH, flow velocity, sulfide preexposure, various sulfide species, and simultaneous exposure to sulfide and oxygen. The presence of sulfide in seawater was found to prevent formation of the protective corrosion product that normally forms on coppernickel alloys, Therefore, when both sulfide and oxygen were present in the seawater, the corrosion of the alloys was greatly accelerated. A qualitative model was developed to explain the mechanism of uniform corrosion of coppernickel alloys in various seawater environments. Author

Descriptors:

• *CORROSION
• *SEA WATER
• *SULFIDES
• *COPPER NICKEL ALLOYS
• VELOCITY
• ENVIRONMENTS
• EXPOSURE(GENERAL)
• MODELS
• OXYGEN
• CATHODES
• FLOW RATE
• CATHODIC PROTECTION
• POLLUTION
• ANODES

Subject Categories:

• Properties of Metals and Alloys
• Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE