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cyaniding

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Published: 01 August 2018
Fig. 10.92 Fastener thread cyanided (nitrogen and carbon introduced from a cyanide salt bath). The case thickness can be observed. Etchant: nital. More
Image
Published: 01 January 2017
Fig. 18.8 Hydrogen cyanide cracking in a schedule 80 ASTM A53 black pipe steel drain line. (a) Primary crack penetration has advanced toward the outside diameter. 2% nital etch. Original magnification: 50×. (b) The primary crack is intergranular and contains numerous intergranular branches. 2 More
Image
Published: 01 August 2018
Fig. 10.93 Example of a cyanided layer, without a transition zone. Martensite in the region close to the part surface (to the right). In the part center, martensite and ferrite. Etchant: nital. More
Image
Published: 01 December 1999
Fig. 7.11 Residual stresses (tangential) in cyanide-hardened 40Kh rings before and after tempering (for 1.5 h). Ring dimensions: 80 mm outside diam × 66 mm inside diam × 15 mm high. Case depth 0.22 mm (on outside diam only). Source: Ref 22 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900163
EISBN: 978-1-62708-350-8
... be expensive due to effluent problems caused by the cyanide-base plating solution, which must be neutralized. Nickel is difficult to strip, and the stripping process could affect part surface quality. Paint-On Methods Proprietary brands of stop-off paints generally contain a liquid carrier...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900053
EISBN: 978-1-62708-350-8
... the uniformity requirement through surface contact of the liquid to the steel. The depth and quality of case would be determined by the chemical composition of the liquid. A heat source would be necessary to drive the nitrogen into the steel surface. A cyanide-based salt, it was discovered, fulfilled...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900201
EISBN: 978-1-62708-350-8
... Abstract This chapter provides a detailed discussion of salt bath nitrocarburizing. Process variations discussed include low-cyanide salt bath ferritic nitrocarburizing, salt bath nitrocarburizing plus post treatment, and the Kolene Nu-Tride process. salt bath ferritic nitrocarburizing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
.... It discusses the mechanisms behind interstitial, substitutional, grain boundary, and surface diffusion, the derivation and use of Fick’s laws, and the basic principles of diffusion coating processes, including carburizing, nitriding, nitrocarburizing, cyaniding, carbonitriding, boriding, aluminizing...
Image
Published: 01 July 1997
Fig. 3 Microstructures of alloy 400 (UNS N04400) welded with filler metal 60. (a) As welded; cyanide persulfate etchant, 70x. (b) Welded, plus 20% cold reduction, plus anneal at 871 °C (1600 °F) 2 h; cyanide persulfate etchant, 150x. Source: Ref 4 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440141
EISBN: 978-1-62708-262-4
... Gas Diffused carbon and nitrogen 760–870 (1400–1600) 75 μm–0.75 mm (3–30 mils) 50–65 (a) Liquid (cyaniding) Diffused carbon and nitrogen 760–870 (1400–1600) 2.5–125 μm (0.1–5 mils) 50–65 (a) Ferritic nitrocarburizing Diffused carbon and nitrogen 565–675 (1050–1250) 2.5–25 μm (0.1–1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850538
EISBN: 978-1-62708-260-0
... nickel directly. Electrolytic Copper Strike 22.5 g cuprous cyanide, Cu 2 (CN) 2 33.7 g sodium cyanide, NaCN 15.0 g sodium carbonate, Na 2 CO 3 0.2 g sodium thiosulfate, Na 2 S 2 O 3 ·5H 2 O Procedure: Use at 90–100°F for 1 to 2 minutes at 4 to 6 V. The pH of the solution...
Image
Published: 01 January 2017
Fig. 18.25 Intergranular cracking of sensitized nickel alloy 600 piping in water service containing H 2 S and cyanides. Original magnification: 15×. Source: Ref 18.1 More
Image
Published: 01 March 2012
Fig. 5.30 Cellular colonies growing out from grain boundaries in Au-30Ni alloy aged 50 min at 425 °C (795 °F). Etchant: 50 mL 5% ammonium persulfate and 50 mL 5% potassium cyanide. Original magnification: 100×. Source: Ref 5.16 as published in Ref 5.11 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030209
EISBN: 978-1-62708-282-2
... of corrosive environments. The most common is an aqueous environment containing inorganic and organic acids. However, other aqueous corrosion processes in the refinery can also be due to the presence of oxygen, bisulfide, cyanide, microbiological growth, or other corrosion-inducing species. Nonaqueous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240395
EISBN: 978-1-62708-251-8
.... 21.3.2 Liquid Carburizing Liquid carburizing is carried out in a bath of fused salt containing 20 to 50 wt% sodium cyanide, up to 40 wt% sodium carbonate, and varying amounts of either sodium or barium chloride. The bath temperature ranges from 870 to 955 °C (1600 to 1750 °F). Carburization time...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900193
EISBN: 978-1-62708-350-8
... methods of ferritic nitrocarburizing were accomplished in low-temperature (550 °C, or 1020 °F) salt baths working on the principle of the decomposition of cyanide to cyanate (in the ferrite region). Imperial Chemical Industries in England pioneered the salt bath process, which was called the “Sulfinuz...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900231
EISBN: 978-1-62708-350-8
... disposal. Good housekeeping of the salt bath work area is essential not only in terms of cleanliness but also personal safety. Effluent disposal is a subject addressed by all of the process salt manufacturers, who now produce process salts with very low cyanide contents, to less than 4 wt%. Although...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900185
EISBN: 978-1-62708-350-8
... of the nitriding salt. Once the salt chemistry is understood, along with the basics of salt titration for measuring nitriding activity, the bath should be titrated at least once per day in order to maintain a consistent bath activation. The usual practice is to titrate for cyanide only, not carbonate. Bath...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740271
EISBN: 978-1-62708-308-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.9781627084321
EISBN: 978-1-62708-432-1