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polythionic acid

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001774
EISBN: 978-1-62708-241-9
... steel; the flange from type 321, and the ring gasket from 347. Examination revealed that the failure occurred by transgranular stress-corrosion cracking, initiated by the presence of polythionic acid. Detailed metallurgical investigation was subsequently conducted to identify what may have caused the...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001345
EISBN: 978-1-62708-215-0
... decreases dramatically for cold reductions greater than about 25%. The EDS analysis of the fracture surface deposits revealed the presence of sulfur. Sulfur was also detected at the crack terminus. Sulfur, in the form of sulfur acids such as sulfurous acid of polythionic acid, is known to attack...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001059
EISBN: 978-1-62708-214-3
... been leached from the surface. The high sulfur content could suggest SCC induced by polythionic acid, but that type of cracking is intergranular, rather than transgranular. Table 1 Results of chemical analysis Material Composition, % Al Si S K Ca Cr Fe Ni Zn Mn Deposit from...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... Fixed Equipment in the Refining Industry,” identifies five types of SCC (chloride, caustic, polythionic acid, wet H 2 S-SCC, and ammonia) experienced by crude units in petroleum refineries ( Fig. 2 , Ref 6 ). In industrial and residential plumbing systems, SCC can occur in brass plumbing components...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
...-hardened neck regions of a type 316L stainless steel screen that was exposed to printing press exhaust fumes containing toluene, sulfur, chlorine, phosphorus, moisture, and other impurities. (a) Unetched, picture width ∼6 mm. (b) Enlarged view of the cracks; 10% oxalic acid electrolytic etch, picture width...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
... strength of 807 MPa (117 ksi), and the material should therefore meet the 517-MPa (75-ksi) tensile-strength requirement. A cross section was ground, polished, lightly etched in 10% oxalic acid, and examined optically. Intergranular cracks filled with oxide were observed to have depths up to about 8 mm...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... deficient in the oxide ion concentration, leading to acidic fluxing that results in pitting attack. Sulfides are found in the pitted area ( Ref 25 ). Low-temperature hot corrosion may involve a gaseous reaction of SO 3 or SO 2 with CoO and NiO, which results in pitting from the formation of low-melting...
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
... particularly susceptible. Additional information is available in the articles “Hydrogen Damage and Embrittlement” in this Volume. The austenitic stainless steels are subject to SCC that is induced by acidic chlorides and fluorides or by polythionic (H 2 S x O 6 ; x = 2 to 6) acids if the...