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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0046366
EISBN: 978-1-62708-236-5
... Abstract Several large chromium-plated 4340 steel cylinders were removed from service because of deep longitudinal score marks in the plating. One of the damaged cylinders and a mating cast aluminum alloy B850-T5 bearing adapter that also exhibited deep longitudinal score marks were submitted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001556
EISBN: 978-1-62708-218-1
... Abstract A few Cr-Mo steel piston rods from different production batches were found identically cracked in the eye end near the radius after chrome plating and baking treatment. Two of them cracked in the plating stage itself instantly broke on slight tapping. Cracking initiated from the outer...
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
... Abstract Electroless nickel plating separation from copper alloy CDA175 retaining clips used on printed circuit boards was caused by a copper oxide layer that reduced adhesion of the nickel plating on the clips. Stresses that developed during module insertion caused flaking to occur...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001641
EISBN: 978-1-62708-235-8
... Abstract Near-surface porosity in zinc die castings that were subsequently plated with copper, nickel, and bright chromium was causing blemishes in the plating. Identifying die casting turbulence and hot spots were keys to process modifications that subsequently allowed porosity to be greatly...
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Published: 01 June 2019
Fig. 9 Small nicks or dents found under the cadmium plating (Cd) and paint (P) in the outside surface of the cylinder near the fracture origin. 1% Nital etch, ×500. More
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Published: 01 June 2019
Fig. 4 Fatigue crack growth in crankshaft shows beach marks. Chromium plating, about 0.010 in. thick, is indicated by arrows More
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Published: 01 June 2019
Fig. 5 Chromium plating on an unworn journal has a multitude of cracks. Magnification 100 times; 2 pct nital. More
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Published: 01 June 2019
Fig. 6 Grinder's scorch mark (arrow) is located at termination of plating on crankshaft. Magnification 50 times More
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Published: 01 June 2019
Fig. 13 General Pitting Corrosion Beneath Electroless Nickel Plating Which Has Been Degraded by High Temperature Exposure. More
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Published: 01 June 2019
Fig. 1 Scoring damage caused by chipping of chromium plating on a 4340 steel cylinder. (a) Scoring on the cylinder. (b) Scoring on a mating cast aluminum alloy B850-T5 bearing adapter. (c) Cross section through a deep score mark in the aluminum alloy adapter revealing a large embedded particle More
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Published: 01 June 2019
Fig. 2 Portable optical microscopy revealing plating nodules in the nondiscolored area of the cylinder (left). A rougher surface texture is noted in the discolored region (right), along with adherent deposits. More
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Published: 01 June 2019
Fig. 6 (a) Microstructure of filter material used in the Nickel plating tank. (b) Microstructure and the EDS spectra from the filter material used in the air ducts above the plating line. More
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Published: 01 June 2019
Fig. 5 SEM micrograph showing peeled off copper plating due to hydrogen effusion More
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Published: 01 June 2019
Fig. 1 Electroless nickel underplating and gold plating on a copper alloy CDA175 module retaining clip. (a) shows a good plated clip and (b) shows a bad clip with copper oxide (black layer) at the copper/alloy nickel plating interface, where the separation occurred. More
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Published: 01 June 2019
Fig. 3 (a) Hybrid package with opened lid showing spalled plating. (b) and (c) show the tin plating over oxidized copper and clean copper, respectively. Layering phenomenon can be seen in the copper plating. More
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Published: 01 December 1993
Fig. 7 Minute dezincification under the plating of the second valve. Etched with NH 4 OH/H 2 O 2 . 630× More
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Published: 01 December 1993
Fig. 1 Heat-treated end frame component after cadmium plating. Several tiny cracklike indications, primarily in the base fillet radial zones, were detected by magnetic-particle testing. More
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Published: 01 December 1993
Fig. 2 Indications of cracking in the hard chromium plating (arrow) at the axle (lower) end. Note the banded appearance of the cracking. More
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Published: 01 December 1993
Fig. 8 Section through the cracking adjacent to the chromium plating runout.C,chromium; S,steel.The arrows indicate regions of transgranular cracking produced by fatigue, which grew from the intergranular crack tips.2% nital etch. More
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Published: 01 December 1992
Fig. 5 EDS spectra of the base metal of the screw (a) and the plating on the outside surface (b). More