Analysis of Galvanic Corrosion between a Titanium Condenser and a Copper-Nickel Piping System
Abstract
Tests were conducted in a specially designed seawater-corrosion test loop to evaluate the extent of galvanic corrosion expected from the installation of an all-titanium steam condenser in a shipboard 70-30 copper-nickel piping system. Titanium to copper-nickel area ratios of 1:1, 2:1, and 100:1 were used in the loop. Copper-nickel specimens were exposed to seawater at a velocity of 10 feet per second and temperatures between 75 and 110 F (24 to 43 C). Corrosion rates for uncoupled copper-nickel specimens increased from 0.5 to 2.2 mils per year (0.01 to 0.06 millimeter per year) to 5.1 to 23.5 mils per year (0.13 to 0. 60 millimeter per year) upon coupling to a simulated titanium condenser. Results showed that a change in the area ratio from 1:1 to 100:1 only doubled the corrosion rate of the copper-nickel specimens. No significant difference in corrosion rate was found between seawater inlet and outlet ends of the condenser. Complete corrosion protection was established by the use of sacrificial zinc or impressed-current cathodic-protection systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1976
- Accession Number
- ADA020476
Entities
People
- HP Hack
- Wayne L. Adamson