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Dealloying/selective leaching

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091378
EISBN: 978-1-62708-219-8
... Perforation Piping C28000 UNS C28000 Dealloying/selective leaching A 12.7 mm (0.5 in.) diam tube was removed from a potable water supply due to leaks. The tube wall thickness was 0.711 mm (0.028 in.) with a thin layer of chromium plate on the OD surface. The tube had been in service for approximately...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
... valves Leakage Nuclear reactor components Welded joints ASME SB148 C95200 UNS C95200 C95400 UNS C95400 Dealloying/selective leaching Background Visual Examination of General Physical Features Testing Procedure and Results Discussion Conclusion and Recommendations...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047335
EISBN: 978-1-62708-219-8
... typical of cast iron pipe. Chemical analyses of the porous region had a substantial increase in carbon, silicon, phosphorus, and sulfur. The porous appearance and the composition of the soft porous residue confirmed graphitic corrosion. The selective leaching of iron leaves a residue rich in carbon...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047332
EISBN: 978-1-62708-234-1
... from the continuous erosion of the residue by action of the water within the pump. Corrosion products Erosion Residues Sand castings Gray iron Dealloying/selective leaching Deterioration of the vanes and a wearing away of the area surrounding the mainshaft-bearing housing of the pump...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001409
EISBN: 978-1-62708-229-7
... the tube wall thickness. Condenser tubes Dezincification Steam turbines 80Cu-20Zn 70Cu-30Zn Dealloying/selective leaching Dezincification is a particular form of corrosive attack which may occur in a variety of environments and to which some brasses are susceptible. It is favoured by waters...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001653
EISBN: 978-1-62708-219-8
... to use components made of different alloys in the same valve, but this is not the best approach for all applications. Dezincification Valves Water pipelines Leaded red brass Silicon brass Dealloying/selective leaching Galvanic corrosion After six years of service, three water valves...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001373
EISBN: 978-1-62708-215-0
... corrosion Dealloying/selective leaching Background Testing Procedure and Results Conclusion and Recommendations Selected Reference Selected Reference • Forms of Corrosion , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 761 – 795 10.31399...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091384
EISBN: 978-1-62708-219-8
.... Ductile iron or coated and lined steel pipe, generally not susceptible to graphitic corrosion, were suggested as suitable replacement materials, and cathodic protection was also considered as a possibility. Galvanic corrosion Graphitization Piping Gray iron Dealloying/selective leaching...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001651
EISBN: 978-1-62708-229-7
... to eliminate sulphates, ammonia, etc., and to run trials on one unit with tubes of other alloys such as 80-20 Cu-Ni or 70-30 Cu-Ni to evaluate their performance prior to any large scale retubing operations. Admiralty brass Stress-corrosion cracking Intergranular corrosion Dealloying/selective leaching...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001439
EISBN: 978-1-62708-235-8
... in these units indicated severe service conditions, a proprietary alloy similar to AG1, but containing 3% nickel, was recommended. Brazed joints Brazing alloys Heating equipment Intermetallic phases Cu-14Ag-5P 90Cu-10Ni Joining-related failures Dealloying/selective leaching Persistent leakage...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001410
EISBN: 978-1-62708-220-4
.... The helical mode of the cracking was probably due to the torsional stresses which would be imposed on the elbow by thermally induced movements of the coil in service. Dezincification Heat distributing units Steam Stresses Torsion 60Cu-40Zn 70Cu-30Zn 80Cu-20Zn Dealloying/selective leaching...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001165
EISBN: 978-1-62708-234-1
... of the “sulfate” found in the scrubbing water was actually sulfide (including hydrogen sulfide) and was the main cause of corrosion. Graphitic corrosion Pump impellers Sulfides Gray iron Dealloying/selective leaching A Cast iron pump impeller showed strong corrosion after an operating period...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046469
EISBN: 978-1-62708-229-7
... for this application; however, this alloy is not as resistant to impingement attack as copper alloy C68700. Air compressors Dezincification Tubes C27000 Yellow brass, 65% Cu UNS C27000 Dealloying/selective leaching After about 17 years in service, copper alloy C27000 (yellow brass, 65% Cu) innercooler...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001411
EISBN: 978-1-62708-234-1
... joints 60Cu-40Zn 80Cu-20Zn 70Cu-30Zn Dealloying/selective leaching Dezincification is a particular form of corrosive attack which may occur in a variety of environments and to which some brasses are susceptible. It is favoured by waters having a high oxygen, carbon dioxide, or chloride content...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001045
EISBN: 978-1-62708-214-3
... a dezincification-resistant alloy was recommended. Cooling systems Dezincification Hydroelectric power generation Lubrication systems Yellow brass, 65% Cu UNS C27000 Dealloying/selective leaching Background Visual Examination of General Physical Features Testing Procedure and Results...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046926
EISBN: 978-1-62708-232-7
... that the cause of failure of each of the three salt pots was severe intergranular corrosion accompanied by substantial chromium depletion. No recommendations were made. Dechromizing Salt baths Salt pots RA-330 UNS N08330 Dealloying/selective leaching Intergranular corrosion High-temperature...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046737
EISBN: 978-1-62708-229-7
.... Replacement bolts and nuts should be made from copper alloy C65100 or C65500 (wrought silicon bronze). Castings Cooling towers Dezincification UNS C86300 C86300 C86200 C46400 UNS C86200 UNS C46400 Stress-corrosion cracking Dealloying/selective leaching After 14 months of service, cracks...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001684
EISBN: 978-1-62708-225-9
... of penetration was consistent with dezincification rates reported in the literature for such brasses in salt water if the valve had been in service about 55 years. Dezincification Marine environments Tug boats Valve seats Alpha brass Alpha-beta brass Dealloying/selective leaching Introduction...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001536
EISBN: 978-1-62708-229-7
... corrosion cracking (IGSCC) Nuclear power plants Nuclear reactor coolant piping Nuclear Pump seal wear rings Pump shaft cracking Stress corrosion cracking 304 UNS S30400 Cemented carbide Stress-corrosion cracking Dealloying/selective leaching 1. Introduction 2. Radioactivity Considerations...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
..., uniform corrosion, pitting and crevice corrosion, intergranular corrosion, and velocity-affected corrosion. The article contains a table that lists combinations of alloys and environments subjected to selective leaching and the elements removed by leaching. corrosion crevice corrosion...