Non-Toxic Environment for Ferritic Nitrocarburising Process

Branzei, Mihai; Cojocaru, Mihai Ovidiu; Druga, Leontin Nicolae; Tudose, Florica; Trusca, Roxana

Mihai Branzei, Mihai Ovidiu Cojocaru, Leontin Nicolae Druga, Florica Tudose, Roxana Trusca

Non-Toxic Environment for Ferritic Nitrocarburising Process

Abstract:

Experimental research aimed to find a solution for replacing components with high toxicity (or generating such components as a result of reactions occurring in the environment at processing temperatures) from the environments used for ferritic nitrocarburising process (FNCP) with non-hazardous components, but extremely active during the process. In the temperature range in which this type of processing is applied (lower than the eutectoid transformation temperature in the Fe-N phase diagram), the most commonly used media are liquid or gaseous; liquid ones contain toxic components (sodium or potassium cyanates/cyanides), and gaseous ones require complex equipments. Packing is extremely rarely used, but in this case pack-mix contain toxic components (15 ÷ 20 wt.% sodium or potassium ferrocyanide). Urea also called carbamide (CO (NH2)2) is the active component in the pack-mixing proposed to be used for FNCP. Carbamide is used in low temperature cyanidation thermochemical heat treatment (liquid FNC), together with sodium or potassium carbonates, resulting in very toxic reaction products (sodium or potassium cyanates). Compared to cyanidation, in the version proposed in the paper, the carbamide does not react with carbonates because they are not found in the composition of the environment but decomposes in the presence or absence of oxygen (by a disproportionation reaction) with the formation of some gas molecules interesting for the process. It has been concluded that the use of carbamide together with two other components, activated charcoal (having a triple role - dispersing, storage, surface saturation) and respectively ammonium chloride as surface reaction activator, is an effective solution for achieving the desired goals by applying this type of thermochemical processing to a wide range of products made of quality steels up to alloy miscellaneous steels.

Keywords:
ferritic nitrocarburising (FNC); average toxicity; ionic adsorption mechanism

Issue: 2018, Volume 69, Issue 9

Pages: 2416-2419

Publication date: 2018/10/15

https://doi.org/10.37358/RC.18.9.6587

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This article is published under the Creative Commons Attribution 4.0 International License

Citation Styles

Cite this article as:
BRANZEI, M., COJOCARU, M.O., DRUGA, L.N., TUDOSE, F., TRUSCA, R., Non-Toxic Environment for Ferritic Nitrocarburising Process, Rev. Chim., 69(9), 2018, 2416-2419.

Vancouver
Branzei M, Cojocaru MO, Druga LN, Tudose F, Trusca R. Non-Toxic Environment for Ferritic Nitrocarburising Process. Rev. Chim.[internet]. 2018 Sep;69(9):2416-2419. Available from: https://doi.org/10.37358/RC.18.9.6587

APA 6th edition
Branzei, M., Cojocaru, M.O., Druga, L.N., Tudose, F. & Trusca, R. (2018). Non-Toxic Environment for Ferritic Nitrocarburising Process. Revista de Chimie, 69(9), 2416-2419. https://doi.org/10.37358/RC.18.9.6587

Harvard
Branzei, M., Cojocaru, M.O., Druga, L.N., Tudose, F., Trusca, R. (2018). 'Non-Toxic Environment for Ferritic Nitrocarburising Process', Revista de Chimie, 69(9), pp. 2416-2419. https://doi.org/10.37358/RC.18.9.6587

IEEE
M. Branzei, M.O. Cojocaru, L.N. Druga, F. Tudose, R. Trusca, "Non-Toxic Environment for Ferritic Nitrocarburising Process". Revista de Chimie, vol. 69, no. 9, pp. 2416-2419, 2018. [online]. https://doi.org/10.37358/RC.18.9.6587

Text
Mihai Branzei, Mihai Ovidiu Cojocaru, Leontin Nicolae Druga, Florica Tudose, Roxana Trusca,
Non-Toxic Environment for Ferritic Nitrocarburising Process,
Revista de Chimie,
Volume 69, Issue 9,
2018,
Pages 2416-2419,
ISSN 2668-8212,
https://doi.org/10.37358/RC.18.9.6587.
(https://revistadechimie.ro/Articles.asp?ID=6587)
Keywords: ferritic nitrocarburising (FNC); average toxicity; ionic adsorption mechanism

RIS
TY - JOUR
T1 - Non-Toxic Environment for Ferritic Nitrocarburising Process
A1 - Branzei, Mihai
A2 - Cojocaru, Mihai Ovidiu
A3 - Druga, Leontin Nicolae
A4 - Tudose, Florica
A5 - Trusca, Roxana
JF - Revista de Chimie
JO - Rev. Chim.
PB - Revista de Chimie SRL
SN - 2668-8212
Y1 - 2018
VL - 69
IS - 9
SP - 2416
EP - 2419
UR - https://doi.org/10.37358/RC.18.9.6587
KW - ferritic nitrocarburising (FNC)
KW - average toxicity
KW - ionic adsorption mechanism
ER -

BibTex
@article{RevCh2018P2416,
author = {Branzei Mihai and Cojocaru Mihai Ovidiu and Druga Leontin Nicolae and Tudose Florica and Trusca Roxana},
title = {Non-Toxic Environment for Ferritic Nitrocarburising Process},
journal = {Revista de Chimie},
volume = {69},
number = {9},
pages = {2416-2419},
year = {2018},
issn = {2668-8212},
doi = {https://doi.org/10.37358/RC.18.9.6587},
url = {https://revistadechimie.ro/Articles.asp?ID=6587}
}

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