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zinc alloys

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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
... pictured in Fig. 1(a) broke apart in four places. In Fig. 1(b) , the separation second from the left and second from the right are complete breaks that occurred in service. The casting shown in Fig. 1(c) broke into three pieces in service. Fig. 1 Copper-zinc alloy cooling-tower hardware...
Image
Published: 01 June 2019
Fig. 1 Die-cast zinc alloy nuts from a water tap. (a) Nut for the cold-water tap that failed by SCC. (b) Mating nut for the hot-water top that shows only isolated areas of corrosion. (c) Unetched section showing metal in the cold-water tap after corrosion testing. 600× More
Image
Published: 01 June 2019
Fig. 1 Copper-zinc alloy cooling-tower hardware that failed by SCC and dezincification. (a), (b), and (c) Photographs showing some of the castings that broke into two or more parts in service. 1 3 ×. In (b), separations other than those second from left and second from right were More
Image
Published: 01 January 2002
Fig. 11 Die-cast zinc alloy nuts from a water tap. (a) Nut for the cold-water tap that failed by SCC. (b) Mating nut for the hot-water top that shows only isolated areas of corrosion. (c) Unetched section showing metal in the cold-water tap after corrosion testing. 600× More
Image
Published: 30 August 2021
Fig. 11 Die-cast zinc alloy nuts from a water tap. (a) Nut for the cold-water tap that failed by stress-corrosion cracking. (b) Mating nut for the hot-water top that shows only isolated areas of corrosion. (c) Unetched section showing metal in the cold-water tap after corrosion testing More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048620
EISBN: 978-1-62708-225-9
... impurities, such as lead, tin, or cadmium. This composition problem with zinc alloys was recognized many years ago, and particular attention has been directed toward ensuring that high-purity zinc is used. This corrective measure reportedly resulted in virtual elimination of this type of defect...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090971
EISBN: 978-1-62708-222-8
... Abstract A die-cast zinc adapter used in a snowthrower failed catastrophically in a brittle overload manner. The component had a chemical composition similar to standard zinc alloy ZA-27 (UNS Z35840), although the iron content was much higher and the copper slightly lower. The mechanical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001215
EISBN: 978-1-62708-235-8
... Abstract The surface of a hook did not possess the smooth and shiny zinc bloom surface normally observed on hot galvanized steel parts but was matte and rough. Large cracks were observed in the zinc layer. The hook was made of silicon-killed alloy steel 41Cr4. A silicon content of 0.27...
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
... oxygen, carbon dioxide, or chloride content, and is accelerated by elevated temperatures and low water velocities. It is believed that, in the initial stages, solution of the copper-zinc alloy takes place, this being followed by a secondary reaction resulting in the elector-chemical redeposition...
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
.... It is believed that, in the initial stages, solution of the copper-zinc alloy takes place, this being followed by a secondary reaction resulting in the elector-chemical redeposition of the copper. The net result of the process is that sound metal is gradually replaced by a brittle, porous deposit of copper...
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
... was the result of the use of an uninhibited brass that has a high zinc content and therefore is readily susceptible to dezincification. Recommendations The material for the tubes should be replaced with copper alloy C68700 (arsenical aluminum brass), which contains 0.02 to 0.06% As and is highly resistant...
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
..., and is accelerated by elevated temperatures and low water velocities. It is believed that, in the initial stages, solution of the copper-zinc alloy takes place, this being followed by a secondary reaction resulting in the elector-chemical redeposition of the copper. The net result of the process is that sound...
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Published: 01 December 1992
Fig. 2 As-polished specimen of zinc-aluminum alloy Eutectic and proeutectic areas are shown. Black β-zinc precipitates inside proeutectic areas are β-Zn. More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001123
EISBN: 978-1-62708-214-3
... environment in a coastal area. It was recommended that proper chemical analysis of the zinc-aluminum alloy be carried out as a quality control procedure. Die castings Marine environments Zamak 3 Intergranular corrosion Intergranular fracture Background Extensive cracking was found in a batch...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
.... When an alloy is corroded, its component metals go into solution as their respective ions. More importantly, more than one reduction reaction can occur during corrosion. Consider the corrosion of zinc in aerated hydrochloric acid. Two cathodic reactions are possible: the evolution of hydrogen...
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Published: 01 June 2019
Fig. 3 Comparative micrograph showing a zinc layer of the usual thickness with normal structure (controlled galvanisation). The alloy layers are covered by a pure zinc layer with only isolated embedded alloy grains. 200 × More
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Published: 01 June 2019
Fig. 2 Microstructure of the zinc layer on a section taken perpendicular to the surface of the hook at a point at which the zinc layer was still adhering. The pure zinc layer has been consumed by excessive alloy formation. 200 × More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
... particles, and dimpled cellular regions in the matrix. The secondary fracture surface demonstrates similar features of intergranular fracture. aircraft landing gear intergranular fracture overaging cast aluminum-zinc alloy shrinkage porosity fractographic analysis optical emission spectroscopy...
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
... compound, nickel phosphide. The use of a brazing alloy containing phosphorus was unsuitable on two counts and a quaternary alloy containing silver, copper, cadmium and zinc, such as those in group AG1 or AG2 of BS 1845 would be more suitable. However, because corrosive problems experienced in these units...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046079
EISBN: 978-1-62708-233-4
... that prolonged heating of the galvanized steel heater shells caused the zinc-rich surface to become alloyed with iron and reduce the number of layers. Also, heating caused zinc to diffuse along grain boundaries toward the center of the sheet. Zinc in the grain boundaries reacted with iron to form the brittle...