Study of the effects of interleakage of ammonia and seawater on corrosion and scaling of candidate materials for OTEC heat exchngers. Final report

Technical Report · Tue Jul 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/7016750· OSTI ID:7016750

Grimes, W D; Schrieber, C F; Manning, J A

Assessment has been made on the effect of small concentrations of ammonia in seawater and varying concentrations of seawater in anhydrous ammonia upon corrosion and scaling of candidate OTEC heat exchanger materials - A1-5052, Alclad 3003, copper alloys 706, 715 and 722, AL-6X stainless steel and CP titanium. Results are presented. AL-6X stainless steel and CP titanium showed exceptional corrosion resistance to all test environments. Alclad alloy 3003 showed satisfactory performance in seawater and seawater plus ammonia environments. Only minimal pitting was observed and this was limited to the sacrificial cladding in seawater plus ammonia only. Cladding alloy 7072 showed unacceptable corrosion resistance in anhydrous ammonia containing low seawater concentrations. Al-5052 tubes showed unsatisfactory corrosion behavior in the presence of seawater flow with ammonia interleakage. Copper alloys considered showed unacceptable corrosion resistance in all seawater environments containing ammonia. Low pressure differentials between seawater and anhydrous ammonia in the tube testing unit resulted in scaling and moderately efficient plug seal formation at the artificial leak sites of the tubes. It is recommended that Alclad 3003, CP titanium and AL-6X stainless steel tubes be assessed for suitability in the presence of probable OTEC cleaning systems.

• Research Organization: Dow Chemical U.S.A., Freeport, TX. Texas Div.
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7016750
• Report Number(s): ANL/OTEC-BCM-012
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140800* -- Solar Energy-- Ocean Energy Systems
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
AMMONIA
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
ELEMENTS
EXPERIMENTAL DATA
FOULING
GRAPHS
HEAT EXCHANGERS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LEAK TESTING
LEAKS
MATERIALS TESTING
METALS
NICKEL ALLOYS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
OCEAN THERMAL POWER PLANTS
OXYGEN COMPOUNDS
PERFORMANCE
PERFORMANCE TESTING
PITTING CORROSION
POWER PLANTS
SCALING
SEAWATER
SOLAR POWER PLANTS
STAINLESS STEELS
STEELS
TESTING
THERMAL POWER PLANTS
TITANIUM
TRANSITION ELEMENTS
TUBES
WATER
WEIGHT MEASUREMENT