The galvanic coupling of UNS NO4400 heat exchanger tubes to carbon steel anodes
Book
·
OSTI ID:109947
- Kuwait Institute for Scientific Research, Safat (Kuwait). Materials Application Dept.
Laboratory study using a specially designed circulating test rig was carried out to investigate the effectiveness of achieving complete cathodic protection of UNS NO4400 heat exchanger tubes in seawater applications. Cyclic polarization of the UNS NO4400 alloy tube material was conducted to determine the pitting and repassivation (protection) potentials prior to the galvanic coupling study. The parameters studies include the potential-time relationship of uncoupled and coupled steel to UNS NO4400 alloy tubes, effect of anode size, galvanic current distribution, effect of water flow direction and galvanic potential distribution at different tube lengths. The results indicated that sufficient sacrificial protection can be achieved to prevent pitting corrosion of UNS NO4400 alloy tubes when coupled to steel anodes in flowing seawater environment.
- OSTI ID:
- 109947
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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