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gold alloys

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0006440
EISBN: 978-1-62708-234-1
... electron microscopy. The corrosion product contained molybdenum and copper with a trace of gold. The base material was analyzed as molybdenum with negligible alloying additions. The primary mode of corrosion attack on the base material appeared to be intergranular, although uniform corrosion was evident...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047756
EISBN: 978-1-62708-235-8
... extremities of a granular gold-tinted surface region adjacent to the tube-to-sleeve brazed joint and extending circumferentially were revealed by microscopic examination. Embrittlement of the tube caused by molten braze metal penetration along grain boundaries was evidenced by micrographs of a granular...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001492
EISBN: 978-1-62708-235-8
... plating flaking when the modules were inserted and removed. The retaining clips had 150 µin thick electroless nickel underplating and 100 µin thick gold plating. When the printed circuit board modules were inserted in the clips, shear and/or tensile stresses were generated at the copper base alloy/nickel...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
... that the metallic portion was silver. The dark phase was carbon rich, supporting the visual observation that the binder in the thick-film ink was polymer based. EDS analysis of the electroplated layers confirmed that the barrier layer was nickel and that the surface layer was tin-lead alloy. The gold-colored...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001674
EISBN: 978-1-62708-234-1
... are produced in the thermal decomposition of PETN at 100 C. This was a very unusual corrosion problem in that a very noble metal, gold, was being corroded preferentially to a much more reactive alloy, the Pb-Sn-In solder. The obvious conclusion that the corrosion was due to a complexing agent, specific...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
... of engineering materials, is presented. As an example, the materials and metallographic techniques employed in an actual on-site investigation of a gas tungsten-arc weldment joining two large diameter Ti-6Al-4V alloy cylinders are discussed in depth to illustrate what can be accomplished. Cylinders Field...
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
... in galvanic couples with other metals or alloys. This effect is observed with gold and silver coatings on copper, nickel, aluminum, and their alloys. Uniform Corrosion Uniform corrosion, or general corrosion, is a corrosion process exhibiting uniform thinning that proceeds without appreciable localized...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... in galvanic couples with other metals or alloys. This effect is observed with gold and silver coatings on copper, nickel, aluminum, and their alloys. Uniform Corrosion Uniform corrosion, or general corrosion, is a corrosion process exhibiting uniform thinning that proceeds without appreciable localized...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006759
EISBN: 978-1-62708-295-2
.... “ Standard Test Methods and Definitions for Mechanical Testing of Steel Products ,” A370 – A316 , ASTM 2. “Hardness and Conductivity Inspection of Wrought Aluminum Alloy Parts,” AMS 2658 Rev C, SAE, revised 2009 3. “ Standard Specification for Carbon Structural Steel,” A36/A36M-14 , ASTM...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
.... Fig. 13 Ductile fatigue striations in aluminum alloy 2024-T3. (a) The uniformity of the crack-propagation process is well illustrated. There was little or no interaction of the fracture process with the inclusion within the rectangle. The long ridges are believed to be high-angle steps at subgrain...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006769
EISBN: 978-1-62708-295-2
... of the coatings to suffer. Typical metals used for coating are gold and platinum, with finer-grained coatings being produced as the evaporation temperature increases. One drawback of metallic films is that the coating produced will be detected in any subsequent x-ray investigations. If chemical analysis...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... contacts; gold alloys are the preferred coating because they are not subject to oxide formation, which is disastrous in its effect on conductivity ( Ref 108 ). The growth of oxide films at high temperatures has been specified to provide wear-resistant self-repairing coatings. These have been improved...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001269
EISBN: 978-1-62708-215-0
.... 50×. Fig. 8 Energy dispersive spectra showing titanium and nitrogen on the surface. Sample after gold sputter coating. 500×. Hardness Hardness readings taken in accordance with ASTM E18-89 indicate the bulk/core hardness to be 64 HRC. Knoop readings were taken in accordance...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001292
EISBN: 978-1-62708-215-0
...Abstract Abstract A crack was detected in one arm of the right-hand horizontal brace of the nose landing gear shock strut from a large military aircraft. The shock strut was manufactured from a 7049 aluminum alloy forging in the shape of a delta. A laboratory investigation was conducted...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003529
EISBN: 978-1-62708-180-1
... thiocyanate/acetone Blue color Identify cobalt-base alloys Copper Dithizone Purple color Sort copper-bearing stainless steels Iron Potassium ferricyanide Blue precipitate Sort low-iron high-temperature alloys Lead Sulfuric acid White precipitate Sort leaded bronze Molybdenum Potassium...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001528
EISBN: 978-1-62708-219-8
... of the chlorides responsible for TGSCC and corrosion of the tank OD. Fig. 6 EDS chemical analysis of the black foam insulation reveals a high level of chlorine. Sample is sputter-coated with gold. Circumferential and axial cross sections were metallographically prepared for examination of crack...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
...Approximate temperatures for onset of creep behavior for select alloy groups Table 1 Approximate temperatures for onset of creep behavior for select alloy groups Alloy group Temperature for onset of creep °C °F T as ratio of T M , K Aluminum alloys 150–200...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001666
EISBN: 978-1-62708-229-7
...Abstract Abstract Stress-corrosion cracking of low-alloy steel turbine discs has emerged as a generic concern in nuclear generating stations. An investigation that made extensive use of field metallographic techniques to examine suspected cracking in such a component is described. The crack...
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
.... Essentially, passivity refers to the loss of chemical reactivity experienced by certain metals and alloys under particular environmental conditions. That is, certain metals and alloys become essentially inert and act as if they were noble metals such as platinum and gold. Fortunately, from an engineering...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... electrical power is applied. Nickel, nickel-phosphorus, nickel-boron, copper, gold, and cobalt alloy coatings are some common electroless coatings. Electroless processes typically plate more slowly and can be more expensive than electrolytic processes, but the excellent uniformity of the coatings, ability...