Efficacy of an external chromia layer in reducing nitridation of high temperature alloys
Journal article, 2022

Six high temperature alloys have been exposed in N2/H2 environments at 900 °C. In order to study the efficacy of a chromia barrier layer against nitrogen ingress, experiments were performed in two environments having the same N2/H2 ratio but slightly different water content, chromia formation being spontaneous in one case only. The samples were evaluated by SEM/STEM/EDX, XRD, gravimetry and GD-OES. The presence of an external chromia scale reduced nitridation of the alloy by 50–95%. Furthermore, in the presence of a continuous alumina layer no nitridation of the alloy was detected.

B. XRD

B. SEM

C. Oxidation

A. Alloy

B. STEM

C. High temperature corrosion

Author

Tommy Sand

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 1

S. Bigdeli

Swerim AB

Mohammad Sattari

Chalmers, Physics, Microstructure Physics

J. Andersson

Sandvik

M. Hattestrand

Sandvik

T. Helander

Kanthal AB

Johan Eklund

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 1

Jan-Erik Svensson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 1

Mats Halvarsson

Chalmers, Physics, Microstructure Physics

Lars-Gunnar Johansson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry 1

Corrosion Science

0010-938X (ISSN)

Vol. 197 110050

Subject Categories

Other Materials Engineering

Metallurgy and Metallic Materials

Corrosion Engineering

DOI

10.1016/j.corsci.2021.110050

More information

Latest update

1/17/2022