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dealloying

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001772
EISBN: 978-1-62708-241-9
.... After a thorough examination, it was concluded that the part had failed due to dealloying via desiliconification. pump impeller corrosion erosion cast silicon bronze porosity microstructural analysis chemical composition Silicon bronze alloy UNS C86700 Introduction A corroded pump...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001809
EISBN: 978-1-62708-241-9
... dealloying. The dealloying corrosion was exacerbated by erosion because the pump was slightly oversized. The investigation recommended better heat treating procedures and closer evaluation to ensure that new pumps are properly sized. pump impeller corrosion dealloying nickel-aluminum bronze pitting...
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
... fitting and two ASME SB-148 CA 954 valve bodies) and an entire valve assembly. The leaks were found to be in the socket-weld crevice area and had resulted from dealloying. It was recommended that the weld joint geometry be modified. Control valves Cooling systems Cooling water Hydraulic valves...
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Published: 01 December 2019
Fig. 5 Photomicrographs displaying the dealloying taking place at the various surfaces of the part. ( a ) at the tip of a corroded fin, ( b ) in the middle of the same fin, ( c ) a high magnification of the surface in the fin, and ( d ) at the external side of the base on the top half More
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Published: 01 December 2019
Fig. 6 Photomicrograph illustrating the dealloying process observed. The Si-rich phase is preferentially attacked (dealloying) and the Cu constituents are depositing back onto the surfaces More
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Published: 01 December 2019
Fig. 4 Selectively attacked region near the surface contained dealloying ( a ) 12.5× and ( b ) 50×, etchant: 45 mL nitric acid and 45 mL acetic acid. Figure 5 is a higher magnification image of the boxed area in image b More
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Published: 01 December 2019
Fig. 5 Selectively attacked region near the surface contained dealloying ( a ) 100× and ( b ) 500×, etchant: 45 mL nitric acid and 45 mL acetic acid. Figure 6 is a electron micrograph of the boxed area in image b More
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Published: 01 December 2019
Fig. 6 SEM image revealed selective grain attack and dealloying, etchant: 45 mL nitric acid and 45 mL acetic acid. The aluminum concentration was significantly lower than in the bulk material in the area of grain attack More
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Published: 01 December 1993
Fig. 8 Dealloying in a valve section. 31.5× More
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Published: 01 December 1993
Fig. 9 Cross section of valve with well-defined area of dealloying. Etched More
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Published: 01 December 1993
Fig. 6 Micrograph of first valve, showing preferential dealloying of the β phase along an interface. Etched with NH 4 OH/H 2 O 2 . 315× More
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Published: 01 December 1993
Fig. 11 EDS line scan for zinc. As the trace crosses the dealloying interface of the unaffected β grain, the line intensity increases, illustrating the selective removal of zinc from the β phase. More
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Published: 01 December 2019
Fig. 7 EDS elemental dot map of one of the dealloyed regions that had been plated with copper More
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Published: 01 December 1993
Fig. 7 Appearance of γ 2 phase in dealloyed area (arrows). 332× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0006898
EISBN: 978-1-62708-233-4
... after 42 days of exposure to NaNO3 + Ca(NO3)2 solution. None of the cupro-nickel specimens failed, but among those exposed to NH4NO3, 17% displayed crack initiation and 83% showed partial dealloying after 42 days. Based on the test results, the fuse material was changed from nickel silver to cupro...
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Published: 01 January 2002
Fig. 7 Copper-nickel alloy heat-exchanger tubes that failed from denickelification due to attack by water and steam. (a) Etched section through a copper alloy C71000 tube showing dealloying (light areas) around the tube surfaces. Etched with NH 4 OH plus H 2 O. 3.7×. (b) Unetched section More
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Published: 30 August 2021
Fig. 7 Copper-nickel alloy heat-exchanger tubes that failed from denickelification due to attack by water and steam. (a) Etched section through a copper alloy C71000 tube showing dealloying (light areas) around the tube surfaces. Etched with NH 4 OH plus H 2 O. Original magnification: 3.7×. (b More
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
... by intergranular attack and slight dezincification of the inner bore surface of the fitting. Dezincification and intergranular attack were attributed to excessive exposure to nonoxidizing acids in the pickling bath. Dezincification Inert gas service CDA 377 UNS C37700 Intergranular corrosion Dealloying...
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Published: 01 December 1993
Fig. 10 EDS scans of various areas on elbow specimen. (a) Pipe material. (b) Dealloyed area. (c) Casting material More
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
... 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 having a high...