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Chemical attack

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090427
EISBN: 978-1-62708-222-8
... with glyceride derivatives of fats and oils. This supported the conclusion that the grips failed via brittle fracture associated with severe chemical attack of the ABS resin. A significant level of glyceride derivatives of fatty acids, known to degrade ABS resins, was found on the part surface. Chemical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090460
EISBN: 978-1-62708-234-1
... of molecular degradation caused by the service conditions. Specifically, the part material had undergone severe chemical attack, including oxidation and hydrolysis, through contact with silver chloride. The source of the silver chloride was not established, but one potential source was photographic silver...
Image
Published: 15 May 2022
Fig. 33 SEM fractographs of interspherulitic failure of polymer parts manufactured from injection-molded polyoxymethylene. (a) Environmental stress cracking in domestic water containing chloride. Original magnification: 1500×. (b) Chemical attack and degradation. Original magnification: 1000× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001683
EISBN: 978-1-62708-234-1
... . Void surface roughness results from corrosion. Chemical attack of grain boundaries in the cast structure is at a higher rate than attack at a slight distance from the boundaries. The higher magnification view in Figure 9 provides further evidence of the corrosive nature of the attack by focusing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001901
EISBN: 978-1-62708-218-1
... in general and POM in particular are susceptible to thermal attack and chemical attack (via acidic, alkaline, and oxidative antagonists), both of which lead to depoloymerization. The Material Safety Data Sheet for Delrin recommends that, during processing, the polymeric melting temperature be less than 230°C...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0090454
EISBN: 978-1-62708-220-4
... of the vessel. The cracking extended transversely through the wall initially, and subsequently, circumferentially around the wall. Throughout the examination, no signs of postmolding molecular degradation or chemical attack were found. Fig. 1 Scanning electron image showing features associated...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... of which were exposed to the surface. Those which were exposed had been chemically attacked, resulting in various sized surface pits. Chemical Analysis/Identification Material and Weld Chemical analysis of the spar material by x-ray energy spectroscopy revealed an alloy composition similar...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... Abstract The US Army Research Laboratory performed a failure investigation on a broken main landing gear mount from an AH-64 Apache attack helicopter. A component had failed in flight, and initially prevented the helicopter from safely landing. In order to avoid a catastrophe, the pilot had...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001320
EISBN: 978-1-62708-215-0
... characteristic of acidic attack. Energy-dispersive X-ray spectroscope revealed the presence of chlorine in the pit deposits, indicating that the pitting was promoted by underdeposit chloride attack. The presence of copper in deposits on the internal surface of the tubing may have acted as a secondary factor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c0048698
EISBN: 978-1-62708-228-0
.... The tee joint in the piping between the heat exchanger and the sieve bed failed after 12 months. A hole in the tee fitting and a corrosion product on the inner surface of the pitting was revealed by visual examination. Iron sulfide was revealed by chemical analysis of the scale which indicated hydrogen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046227
EISBN: 978-1-62708-217-4
... Abstract The floors (fabricated from aluminum alloy 7178-T6 sheet, with portions of the sheet chemically milled to reduce thickness) of the fuel tanks in two aircraft failed almost identically after 1076 and 1323 h of service, respectively. Failure in both tanks occurred in the rear chemically...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001034
EISBN: 978-1-62708-214-3
..., the inteiiors are polished to match the finish of the original steel, and great care is taken to avoid the formation of scratches and crevices that could serve as initation sites for corrosion. Often, however, the chemicals being hauled are not pure and contain contaminants that attack the stainless steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001162
EISBN: 978-1-62708-220-4
... a chemical compound. Before filling, however, a number of the tubes cracked on bending and underwent brittle fracture whilst others remained ductile and showed no sign of failure. There was no question of the cause of failure being corrosive attack by the contents but rather the condition of the material...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001311
EISBN: 978-1-62708-215-0
... in.) by the uniform attack and to 0.56 mm (0.022 in.) by the combined attack; in the tubes that leaked, of course, the combined attack reduced the wall thickness to the point of breakthough at the weld/base metal interfaces. Electroetched in oxalic acid. 49.4× Chemical Analysis/Identification Chemical...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... chemical attack of the matrix or low-melting constituent phases, which disrupts the structure and allows the coarse-grained aggregates to be carried away by the slag movement. When penetration is more important than dissolution, structural spalling, another mechanism of degradation, needs to be considered...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001083
EISBN: 978-1-62708-214-3
... Abstract Copper alloy (C83600) impellers from two different feed pumps that supplied water to a 2-year-old boiler failed repeatedly. Examination by various methods indicated that the failures were caused by sulfide attack that concentrated in shrinkage voids in the castings. Two alternatives...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006926
EISBN: 978-1-62708-395-9
...) physical effects. Chemical attack occurs when chemical reactions result from the interaction between the environment and polymer molecules. This type of interaction may involve chain scission, the degradation of a polymer main chain, which is an irreversible effect. Crazing and microcracking, which...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001104
EISBN: 978-1-62708-214-3
... a lowering of the hot strength of the material used and hence initiate failure of the belt during operation. The theory of sulfur attack and carburization was substantiated by chemical analysis of the old belt material, which contained significantly higher levels of carbon and sulfur than the new belt...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... Examination For metallurgical investigation, microstructural details provide much information about thermal history, operating temperatures, chemical environment, manner of attack, and cracking. Microstructural examination of a section through the fracture surface is an aid in determining...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001704
EISBN: 978-1-62708-218-1
... Abstract Several type 304 stainless steel fire truck water tanks developed through-wall leaks after being in service for approximately two years. One representative tank underwent a comprehensive laboratory analysis, which included metallographic examinations and chemical analyses...