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dezincification

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Published: 01 January 2005
Fig. 1 Plug-type dezincification cross section in a yellow brass (C26000, cartridge brass) tube. Original magnification 15×. Source: Used with permission of ASTM International More
Image
Published: 01 January 2005
Fig. 2 Layer-type dezincification cross section in yellow brass (C26000, cartridge brass) threaded fastener. Original magnification 15×. Source: Used with permission of ASTM International More
Image
Published: 01 January 2003
Fig. 2 Plug-type dezincification in an α-brass (70Cu-30Zn) exposed for 79 days in 1 N NaCl at room temperature. Note porous structure within the plug. Dark line surrounding the plug is an etching artifact. Total width shown is 0.56 mm (2.2 mils). More
Image
Published: 01 January 2003
Fig. 3 Uniform-layer dezincification in an admiralty brass 19 mm ( 3 4 in.) diameter heat-exchanger tube. The top layer of the micrograph, which consists of porous, disintegrated particles of copper, was from the inner surface of the tube that was exposed to water at pH 8.0, 31 to 49 More
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Published: 01 December 1998
Fig. 35 Micrograph showing difference in dezincification of inside and outside surfaces of a plated copper alloy C26000 (cartridge brass, 70% Cu) pipe for domestic water supply. Area A shows plug-type attack on the nickel-chromium-plated outside surface of the brass pipe that initiated below More
Image
Published: 01 December 1998
Fig. 1 Plug-type dezincification in an α-brass (70Cu-30Zn) exposed for 79 days in 1 N NaCl at room temperature. Note porous structure within the plug. The dark line surrounding the plug is an etching artifact. 160× More
Image
Published: 01 December 1998
Fig. 2 Uniform-layer dezincification in an admiralty brass heat-exchanger tube. The top layer of the micrograph, which consists of porous, disintegrated particles of copper, was from the inner surface of the tube that was exposed to water at pH 8.0, 31 to 49 °C (87 to 120 °F), and 207 kPa (30 More
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Published: 01 January 2002
Fig. 40 Views of a through-wall perforation of a chromium-plated α brass (70Cu-30Zn) tube removed from a potable water system due to dezincification. (a) Macroview of tube. (b) Inside diameter surface of the tube shown in (a), depicting localized green deposits at the areas of dezincification More
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Published: 15 January 2021
Fig. 40 Views of through-wall cracking of an alpha leaded brass (62%Cu-35%Zn-3%Pb) thermowell shank removed from a potable hot water system due to dezincification. (a) Macroview of thermowell. (b) Thermowell after sectioning longitudinally to separate mating fracture surfaces associated More
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Published: 01 January 2002
Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. 3 1 2 ×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region below. 100× More
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Published: 30 August 2021
Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. Original magnification: 3.5×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region More
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Published: 15 January 2021
Fig. 9 Optical microscopy image of cross section of as-polished fracture surface showing dezincification. Original magnification: 64.5× More
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Published: 15 January 2021
Fig. 12 Mounted as-polished cross section of failed unit. Pink region shows the extent of dezincification; yellow region is unaffected brass. More
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Published: 15 January 2021
Fig. 11 Optical microscopy image of as-polished fracture surface showing duplex microstructure and a less-advanced region of dezincification. Original magnification: 520× More
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Published: 01 December 2004
Fig. 43 Alloy C28000 (Muntz metal) ingot, hot-rolled plate. Uniform (layer) dezincification. Alpha grains remain in the corroded area (top). Etchant 1, Table 2 . 90× More
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Published: 01 June 2016
Fig. 18 Copper-zinc partial phase diagram showing the hot working, recrystallization, and stress-relieving temperature ranges for α, α + β, and β brasses. DZR, dezincification resistant. Source: Ref 9 More
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Published: 15 January 2021
Fig. 21 (a) Cartridge brass. Dezincified porous area at left is red copper. (b) Cartridge brass showing plug-type dezincification. Dark areas are red copper. Ferric chloride etch. (c) Two-phase brass with red copper in dezincified area and darker band on the inside diameter. Ferric chloride More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003620
EISBN: 978-1-62708-182-5
... Abstract Dealloying is a corrosion process in which one or more elements are selectively dissolved, leaving behind a porous residue of the remaining elements. This article describes the dealloying in various systems, namely, dezincification, graphitic corrosion, dealuminification, and noble...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003137
EISBN: 978-1-62708-199-3
... in which the more active metal is selectively removed from an alloy, leaving behind a weak deposit of the more noble metal. Copper-zinc alloys containing more than 15% Zn are susceptible to a dealloying process called dezincification. In the dezincification of brass, selective removal of zinc leaves...
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
... denickelification desiliconification dezincification galvanic corrosion graphitic corrosion intergranular corrosion pitting corrosion selective leaching uniform corrosion velocity-affected corrosion CORROSION is the electrochemical reaction of a material and its environment. This article addresses...