Long-term tests of dissimilar metal crevice corrosion in filtered seawater

Journal Article · Thu Mar 31 23:00:00 EST 1994 · Materials Performance; (United States)

OSTI ID:7045422

Maurer, J R ^[1]

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1. Allegheny Ludlum Corp., Brackenridge, PA (United States). Technical Center

Dissimilar metal crevice (DMC) corrosion has been found in condensers in which superferritic stainless steel tubes have been expanded into type 316 stainless steel (UNS S31600) tube sheets. Low-pH corrosion products, which formed in the tube-to-tube sheet crevice, cause depassivation and attack of the superferritic alloy. Long-term tests in filtered natural seawater confirm DMC corrosion of several superferritic alloys, including one containing 2% nickel, when in contact with type 316. Superaustenitic 6% molybdenum alloys in contact with type 316 did not show DMC corrosion. As expected, type 316 corroded in these exposures. When superferritic and superaustenitic alloys were tested in contact with each other, neither was attacked.

• OSTI ID: 7045422
• Journal Information: Materials Performance; (United States), Journal Name: Materials Performance; (United States) Vol. 33:4; ISSN MTPFBI; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CONDENSERS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CREVICE CORROSION
FERRITIC STEELS
HEAT RESIS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXYGEN COMPOUNDS
PASSIVITY
SEAWATER
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
WATER