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74833

Oxidation behavior of porous Ni- 4 and 8 wt %Cr alloys in air at 1273K

Article

Last updated: 01 Jan 2025

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-

Tags

Physical chemistry

Abstract

Oxidation behavior of porous Ni-4 and 8 wt% Cr pellets prepared by conventional powder metallurgy was investigated. The pellets were oxidized in air at 1273K for 100 h. The oxidation kinetics were measured by using gravimetric method. The oxide layer morphology and, the surfaces topography and the cross-section microstructure of the oxidized pellets were investigated using X-ray diffraction, optical microscopy, scanning electron microscopy and X-ray energy dispersive analysis. The oxidation rate was initially rapid and then gradually decreased until realizing a constant rate after oxidation time of about 40 h for the 4 wt %Cr pellets with linear rate constant of about 8x10-8 (g/cm2)/sec. For the 8 wt %Cr pellets, the linear rate constant was about 20x10-8 (g/cm2).sec which was achieved after 72 h. Porous nickel oxide scales were formed on the 4 and 8 wt %Cr substrates. Finally, the growth of the oxide scale was explained on the basis of inward migration of molecular oxygen through the porous oxide scale; accordingly, the newly oxide atomic layers were added at the scale/metal interface.

DOI

10.21608/ejchem.2020.18068.2100

Keywords

Porous Ni-4 and 8 wt%Cr alloys, High temperature oxidation, inward molecular oxygen migration, Linear kinetics, Porous oxide scale microstructure

Authors

First Name

Lamiaa

Last Name

Mohamed

MiddleName

-

Affiliation

Mining, Petroleum and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Giza, 12613, Egypt

Email

lamiaa.zaky@cu.edu.eg

City

Cairo

Orcid

-

First Name

Wafaa A.

Last Name

Ghanem

MiddleName

-

Affiliation

Corrosion and Surface Protection, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt

Email

-

City

-

Orcid

-

First Name

Omayma A.

Last Name

El kady

MiddleName

-

Affiliation

Powder Technology Division, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt

Email

-

City

-

Orcid

-

First Name

Mohamed. M.

Last Name

Lotfy

MiddleName

-

Affiliation

Mining, Petroleum and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Giza, 12613, Egypt

Email

-

City

-

Orcid

-

First Name

Hafiz A.

Last Name

Ahmed

MiddleName

-

Affiliation

Mining, Petroleum and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Giza, 12613, Egypt

Email

-

City

-

Orcid

-

First Name

Fawzi A.

Last Name

Elrefaie

MiddleName

-

Affiliation

Mining, Petroleum and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Giza, 12613, Egypt

Email

-

City

-

Orcid

-

Volume

63

Article Issue

10

Related Issue

17778

Issue Date

2020-10-01

Receive Date

2019-10-11

Publish Date

2020-10-01

Page Start

3,735

Page End

3,745

Print ISSN

0449-2285

Online ISSN

2357-0245

Article File

EJCHEM_Volume 63_Issue 10_Pages 3735-3745.pdf

PDF . 1.4MB

Link

https://ejchem.journals.ekb.eg/article_74833.html

Detail API

https://ejchem.journals.ekb.eg/service?article_code=74833

Order

13

Type

Original Article

Type Code

297

Publication Type

Journal

Publication Title

Egyptian Journal of Chemistry

Publication Link

https://ejchem.journals.ekb.eg/

MainTitle

Oxidation behavior of porous Ni- 4 and 8 wt %Cr alloys in air at 1273K

Details

Type

Article

Created At

22 Jan 2023