Localized corrosion of aluminum alloys for OTEC heat ...
@article{osti_5323221, title = {Localized corrosion of aluminum alloys for OTEC heat exchangers}, author = {Dexter, S C}, abstractNote = {The effects of dissolved oxygen, pH and temperature on the rate of initiation and growth of pitting and crevice corrosion of aluminum alloy 5052 and pure aluminum have been determined. Variations in pH and temperature rather than dissolved oxygen are shown ...
Localized corrosion of aluminum alloys for OTEC heat ...
Localized corrosion of aluminum alloys for OTEC heat exchangers. Technical Report Dexter, S C. The effects of dissolved oxygen, pH and temperature on the rate of initiation and growth of pitting and crevice corrosion of aluminum alloy 5052 and pure aluminum have been determined. Variations in pH and temperature rather than dissolved oxygen are ...
FOR OTEC
LOCALIZED CORROSION OF ALUMINUM ALLOYS FOR OTEC HEAT EXCHANGERS Stephen C. Dexter Argunlncr National Laboratory 97190 South Cass Avenue Prepared for the I U. S. Department of Energy Division of Central Solar Technolafly - - Argonne, Illinois 80439 ' .under Contract W-31-109-Eng-38 SOLAR EWIERGY I ' .i
Localized corrosion of aluminum alloys for OTEC heat ...
The impact of these results on the use of aluminum for OTEC heat exchanger tubing and on possible approaches to corrosion control are discussed. The effects of dissolved oxygen, pH and temperature on the rate of initiation and growth of pitting and crevice corrosion of aluminum alloy 5052 and pure aluminum have been determined.
FOR OTEC
LOCALIZED CORROSION OF ALUMINUM ALLOYS FOR OTEC HEAT EXCHANGERS Stephen C. Dexter Argunlncr National Laboratory 97190 South Cass Avenue Prepared for the I U. S. Department of Energy Division of Central Solar Technolafly - - Argonne, Illinois 80439 ' .under Contract W-31-109-Eng-38 SOLAR EWIERGY I ' .i
Localized corrosion of aluminum alloys for OTEC heat ...
The impact of these results on the use of aluminum for OTEC heat exchanger tubing and on possible approaches to corrosion control are discussed. The effects of dissolved oxygen, pH and temperature on the rate of initiation and growth of pitting and crevice corrosion of aluminum alloy 5052 and pure aluminum have been determined.
Localized corrosion of aluminum alloys for OTEC heat ...
Localized corrosion of aluminum alloys for OTEC heat exchangers . By S C Dexter. Cite . BibTex; Full citation; Publisher: Office of Scientific and Technical Information (OSTI) Year: 2014. DOI identifier: 10.2172/5323221. OAI identifier: Provided by: MUCC (Crossref) ...
Hawaii National Marine Renewable Energy Center (HINMREC)
corrosion on aluminum alloys being considered for OTEC heat exchangers. Makai has developed a setup in which pit growth can be observed in-situ by optical imaging and ultrasonic scanning. Pitting sites are identified and corrosion product accumulation on the metal surface is observed using imagery.
OTEC biofouling and corrosion study at the Natural Energy ...
Oct 01, 1990 The major objective was to determine optimal biofouling-control methods. The results of the Phase 1 research were published in a report in 1985. The major objective of the Phase 2 research has been to develop a technical data base for the qualification of aluminum alloys for ocean thermal energy conversion (OTEC) heat-exchanger applications.
Ocean thermal energy conversion—materials issues ...
S.C. Dexter, “Localized Corrosion of Aluminum Alloys for OTEC Heat Exchangers,” ANL/OTEC-BCM-009 (Argonne National Laboratory), January 1979; S.C. Dexter: “On the Localized Corrosion of Aluminum Alloys for OTEC Heat Exchangers,” inProceedings OTEC Biofouling and Corrosion Symposium, Oct. 10–12, 1977.
Qualification of aluminum for OTEC heat exchangers - NASA/ADS
Structural design criteria of aluminum tube heat exchangers to be used in OTEC are discussed. A number of aluminum alloys are considered for further study based on the requirements of the OTEC environment. The requirements include the resistance to penetration by pitting and crevice corrosion. The design considerations include the effects of vibration and fluid velocity, the dimensions of ...
Thin Glass Coatings for the Corrosion Protection of Metals ...
Localized corrosion of aluminum alloys for OTEC heat exchangers. ... results on the use of aluminum for OTEC heat exchanger tubing and on possible approaches to corrosion
Localized Corrosion - an overview ScienceDirect Topics
Localized corrosion is the main limiting factor in determining the service life of equipment (such as carbon steel heat exchangers) in industrial water systems. Chapters 6 and 23 (this volume), describe a sensor system designed to monitor the tendency of cooling water to promote localized corrosion based on the galvanically-coupled differential flow cell concept (Yang, 1995, 2000).
@Ocean Thermal Energy Conversion (OTEC) Biofouling and ...
Corrosion OceanThermal Energy Conversion (OTEC) Corrosion Problemsand Possible Solutions (F.LLaQue)-209 On the Localized Corrosion of Aluminum Alloys for OTECHeat Exchangers (S.C.Dexter) 223 Corrosion and Biofouling on the Nonheat Exchanger Surfaces of an OTECPowerPlant: Problems and Present Status (V.J. Castelli) 243 Design Factors Influencing ...
Effect of mechanical cleaning on seawater corrosion of ...
Aluminum alloys 5052, 3004 and Alclad (7072) 3003 and 3004 have been exposed to warm Hawaiian surface sea water and cold, deep ocean water under simulated OTEC heat exchanger conditions for over three years. Flow velocity has been maintained at 1.85 m/s ( 6 fps) through loops of tubular samples which also contained heat transfer monitors.
Internal corrosion testing of aluminum radiator tube alloys
Dec 31, 1998 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.
Surface Treatment difficult-to-plate ... - otec-kk.co.jp
Based on many years of experience and technologies, Otec applies coherent plating to difficult-to-plate materials such as aluminum and titanium. Chrome plating on aluminum Because aluminum and aluminum alloys are lightweight, relatively strong, and inexpensive, they are widely used in
.MASTER
ANL; OTEC-BCM-012 .MASTER A STUDY OF THE EFFECTS OF INTERLEAKAGE OF AMMONIA AND SEAWATER ON CORROSION AND SCALING OF CANDIDATE MATERIALS FOR OTEC HEAT EXCHANGERS Final Report W. D. Grimes, C. F. Schrieber, and J. A. Manning . ' ' ' -~~ Argonne National Laboratory 9700 South Cass Avenue Prepared for the
Localized corrosion of aluminum alloys for OTEC heat ...
Localized corrosion of aluminum alloys for OTEC heat exchangers . By S C Dexter. Cite . ... pH and temperature on the rate of initiation and growth of pitting and crevice corrosion of aluminum alloy 5052 and pure aluminum have been determined. Variations in pH and temperature rather than dissolved oxygen are shown to account for increased ...
Localized corrosion of aluminum alloys for OTEC heat ...
Localized corrosion of aluminum alloys for OTEC heat exchangers . By S C Dexter. Cite . BibTex; Full citation; Publisher: Office of Scientific and Technical Information (OSTI) Year: 2014. DOI identifier: 10.2172/5323221. OAI identifier: Provided by: MUCC (Crossref) ...
Studies of Localized Corrosion in Welded Aluminum Alloys ...
STUDIES OF LOCALIZED CORROSION IN WELDED ALUMINUM ALLOYS BY THE SCANNING REFERENCE ELECTRODE TECHNIQUE INTRODUCTION Overall corrosion rates of welded aluminum alloys are generally higher than the parent metal, based on previous electrochemical studies 12 made with 2219-T87 A1-Cu and 2195 A1-Li alloys, both
@Ocean Thermal Energy Conversion (OTEC) Biofouling and ...
Corrosion OceanThermal Energy Conversion (OTEC) Corrosion Problemsand Possible Solutions (F.LLaQue)-209 On the Localized Corrosion of Aluminum Alloys for OTECHeat Exchangers (S.C.Dexter) 223 Corrosion and Biofouling on the Nonheat Exchanger Surfaces of an OTECPowerPlant: Problems and Present Status (V.J. Castelli) 243 Design Factors Influencing ...
OTEC Power System Developments
8 Biofouling and Corrosion Biofouling Was a Major Technical Barrier • No significant difference in biofouling behavior for aluminum alloys and titanium or Al-6X stainless steel • Warm water biofouling is controlled by 70 ppb to 100 ppb applied for one hour per day • Negligible biofouling is expected for deep-ocean cold water • Biofouling of non-circular flow passages of plate-fin and ...
OTEC Heat Exchanger Program: 2013 Progress Reports
3.1. ALUMINUM ALLOY PITTING RESULTS The uncoated aluminum alloy 2024 sample developed the most pits. The algorithm was able to identify the majority of these pits by the white corrosion product that was produced. The number of pits detected increased rapidly during the first three days and then began to slowly decrease as shown in Figure 3-1.
Comparison Of Aluminum Alloys And Manufacturing Processes ...
May 03, 2010 The initial results from corrosion testing of six aluminum alloys (Al 5052, 3003, 6063, 1100 and two proprietary alloys) in warm surface and cold deep seawater sources at the Natural Energy Laboratory of Hawaii Authority (NELHA) on the Big Island of Hawaii will be presented.
Nondestructive Monitoring of Biofouling and Corrosion of ...
Three potential OTEC (open and closed cycle) candidate heat exchanger materials were investigated -- copper-nickel, titanium and aluminum alloys. Results indicate that instantaneous corrosion rates can be determined at low frequencies, changes resulting from biofouling occur at high frequencies, the occurrence of localized corrosion and ...
A literature review of the saturation state of seawater ...
Jan 01, 1979 Among the candidate materials for heat exchanger tubes are aluminum alloys. These alloys are known to corrode in seawater. Aluminum corrosion produces strongly alkaline conditions at the metal surfaces, which are functioning as cathodes due to the reduction of oxygen: 02 + 4e- + 2H20 # 4OH- (1) In a pitting situation, as much as 95-98 ~o of the ...
Mechanism of localized corrosion of aluminum–silicon ...
In marine environments, more pits develop on SiC reinforced aluminum alloy composites than on their unreinforced counterparts. Although it has been suggested that the SiC plays an active role in composite corrosion by fostering the initiation of pits, this fact has not been conclusively demonstrated. The present paper considers data of two independent investigations concerning the effects of ...
Thin Glass Coatings for the Corrosion Protection of Metals ...
Localized corrosion of aluminum alloys for OTEC heat exchangers. ... results on the use of aluminum for OTEC heat exchanger tubing and on possible approaches to corrosion
Localized Corrosion of UNS A95052 Aluminum Alloy for ...
Aluminum alloy UNS A95052 (AA5052) is very attractive for desalination applications because of its good corrosion resistance in seawater at temperatures up to 125°C, low cost, good thermal ...
PUBLICATIONS - jhuapl.edu
sive Blistering in the Localized Corrosion of Aluminum," Corrosion 36, 618-625 (1980). ... Folded-Tube Heat Exchangers for Ocean Thermal Energy Conversion," 3rd Miami International Conf. on Alter ... JHU Folded Tube OTEC Heat Ex ...
OTEC Heat Exchanger Program: 2013 Annual Report
A 100 MW OTEC plant envisioned by Makai would house over 200 individual heat exchangers, each larger than a 20’ shipping container. Small changes in heat exchanger performance will have immense economic consequences, and any failure from corrosion or fouling would be catastrophic to the development of a billion dollar OTEC plant. Early in the ...
@Ocean Thermal Energy Conversion (OTEC) Biofouling and ...
Corrosion OceanThermal Energy Conversion (OTEC) Corrosion Problemsand Possible Solutions (F.LLaQue)-209 On the Localized Corrosion of Aluminum Alloys for OTECHeat Exchangers (S.C.Dexter) 223 Corrosion and Biofouling on the Nonheat Exchanger Surfaces of an OTECPowerPlant: Problems and Present Status (V.J. Castelli) 243 Design Factors Influencing ...
Localized Corrosion of UNS A95052 Aluminum Alloy for ...
Aluminum alloy UNS A95052 (AA5052) is very attractive for desalination applications because of its good corrosion resistance in seawater at temperatures up to 125°C, low cost, good thermal ...
The transition from localized corrosion to SCC of aluminum ...
An investigation was conducted to understand the electrochemical and metallurgical processes governing the transition from localized corrosion attack to SCC initiation involved in Al-Li-Cu alloy AA2096 as a function of isothermal aging heat treatment. SCC screening conducted on bluntly notched specimens in 0.6 M NaCl alternate immersion revealed two distinct and separate windows of IGSCC ...
A literature review of the saturation state of seawater ...
Jan 01, 1979 Among the candidate materials for heat exchanger tubes are aluminum alloys. These alloys are known to corrode in seawater. Aluminum corrosion produces strongly alkaline conditions at the metal surfaces, which are functioning as cathodes due to the reduction of oxygen: 02 + 4e- + 2H20 # 4OH- (1) In a pitting situation, as much as 95-98 ~o of the ...
(PDF) Overview of metallic materials for heat exchangers ...
Aluminum alloys 1100, 3003, 5052, and 6063 were examined for their compatibility with the proposed working fluids for Ocean Thermal Energy Conversion (OTEC), anhydrous ammonia, Freon 22 and ...
Localized Corrosion Resistance of Dissimilar Aluminum ...
Despite the great interest in FSW, up to now, only few corrosion studies have been carried out for characterization of the corrosion resistance of dissimilar Al alloys welded by FSW. The aim of this study is to investigate the corrosion behavior of aluminum alloy 2024-T3 (AA2024-T3) welded to aluminum alloy 7475-T761 (AA7475-T761) by FSW.
Aluminum Corrosion - an overview ScienceDirect Topics
Zaki Ahmad, in Principles of Corrosion Engineering and Corrosion Control, 2006. 10.11.1 CORROSION BEHAVIOR OF ALUMINUM IN ATMOSPHERE. From the extensive weight-loss studies conducted around the world on aluminum corrosion rates of 0.03 to 4 µm/year have been reported. The corrosivity of a location would depend upon the distance the airborne salt travels, the direction and velocity of the
PUBLICATIONS - jhuapl.edu
sive Blistering in the Localized Corrosion of Aluminum," Corrosion 36, 618-625 (1980). ... Folded-Tube Heat Exchangers for Ocean Thermal Energy Conversion," 3rd Miami International Conf. on Alter ... JHU Folded Tube OTEC Heat Ex ...
Performance of OTEC Heat Exchanger Materials in Tropical ...
The corrosion of several aluminum alloys in flowing Hawaiian surface seawater and water from 600 m depth for exposure periods up to three years has been studied. The alloys tested in cold water were Alclad (7072) 3003 and 3004; and bare 3004 and 5052). All show some pitting. Pit growth is slow, and pits do not penetrate the cladding. In the warm water, only uniform corrosion has been found.
Active corrosion protection of various aluminium alloys by ...
The corrosion resistance of aluminium alloys depends on the hetero-geneous microstructure from the alloying additions and heat treat-ments. The nature, concentration, and distribution of second‐phase ... facilitate cathodic reactions and initiate localized corrosion in the sur-rounding alloy
Ocean Energy SpringerLink
May 13, 2011 LaQue FL (1979) Qualifying aluminum and stainless alloys for OTEC heat exchangers. In: Proceedings of the ocean thermal energy conversion conference 6th,
Effect of Localized Corrosion on Fatigue-Crack Growth in ...
Corrosion and fatigue of aluminum alloys are major issues for the in-service life assessment of aircraft structures and for the management of aging air fleets. The aim of this work was to evaluate the effect of localized corrosion on fatigue crack growth (FCG) resistance of the AA2198-T851 Al-Li alloy (Solution Heat Treated, Cold Worked, and Artificially Aged), comparing it with the FCG ...
Hirofumi ARIMA(Institute of Ocean Energy)
Heat transfer characteristic of a heat exchanger using aluminum alloy plate for OTEC 2018/09 VISUALIZATION OF NUCLEATE BOILING BUBBLES FROM SINGLE CAVITY UNDER FC-72 FORCED CONVECTION FLOW 2017/12 Heat transfer characteristics of plate heat exchanger for desalination using deep seawater in Kume Island 2017/10
Welding, Joining, and Assembly of Aluminum Extrusions ...
Jun 14, 2018 US9777971 — MODULAR HEAT EXCHANGER — Lockheed Martin Corporation (USA) — The present invention relates to energy conversion in general, and, more particularly, to heat exchangers used for ocean thermal energy conversion (OTEC). A heat exchanger comprising a plurality of aluminum plates that are demountably attached to a frame is disclosed.
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