Effects of alternating seawater flow and stagnant layup conditions on the general and localized corrosion resistance of CuNi and NiCu alloys in marine service

Book · Mon Dec 01 04:00:00 EST 1997

OSTI ID:549892

Kain, R M ^[1]; Weber, B E ^[2]

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1. LaQue Corrosion Services, Wrightsville Beach, NC (United States)
2. NAWC-Aircraft Div., Patuxent River, MD (United States)

From time-to-time seawater handling systems are subjected to lay-up which can produce chemical and biological changes, and conceivably alter the corrosion resistance of metals used in piping and other equipment. In the case of reverse osmosis/membrane technology type desalination equipment, sanitizing agents may be introduced after draining. Simulation tests were conducted to determine any effect of a bisulfite sanitizing treatment when used between periods of normal seawater flow. Corresponding tests were conducted with lay-up comprising non-refreshed seawater which ultimately stagnated. Test results for CuNi alloy C71500 indicted that repeated cycling between seawater exposure and bisulfite treatments was detrimental in reducing that alloy`s resistance to general corrosion, and to a lesser degree its crevice corrosion resistance. The typical pitting and crevice corrosion behavior of NiCu alloy N04400, found upon exposure to slowly moving, aerated seawater was neither diminished or accelerated by cyclic lay-up with either stagnant seawater or the candidate bisulfite-containing solution. However, some increase in general corrosion was observed.

• OSTI ID: 549892
• Report Number(s): CONF-970332--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
COPPER ALLOYS
COPPER BASE ALLOYS
CORROSION RESISTANCE
CORROSIVE EFFECTS
CREVICE CORROSION
EXPERIMENTAL DATA
LIQUID FLOW
NICKEL ALLOYS
NICKEL BASE ALLOYS
PIPELINES
PITTING CORROSION
SEAWATER