Investigation of the Accelerated Corrosion of Cupro-Nickel Piping.
Abstract
The accelerated corrosion (erosion) of 70/30 cupro-nickel alloy was investigated as a function of environment using a laboratory recirculation loop. The environments utilized were unpolluted artificial sea water and artificial sea water polluted with sulfides (Na2S) and two different levels of ammonium ion (NH4Cl). The use of ferrous sulfate (FeSO4) as an inhibitor was also briefly examined. The results indicated that S and NH4+ acting synergistically increased the amount of localized corrosion observed, and the higher level of NH4+ in conjunction with S was even more detrimental, compared to the amount of localized corrosion observed due to S acting alone. Ferrous sulfate treatment of the polluted environment on an intermittent basis reduced the amount of pitting observed, but did not prevent it. Samples were examined visually and microscopically, and surface films identified by use of Energy Dispersive X-Ray Analysis. Micrographs are included and a discussion of possible mechanisms presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA097300
Entities
People
- Martin Richard Brown Jr
Organizations
- Naval Postgraduate School