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Corrosion behaviour of high chromium white irons in high temperature caustic

conference contribution
posted on 06.12.2017, 00:00 by Alan McleodAlan Mcleod, Richard CleggRichard Clegg
High chromium white cast irons are used in a number of applications in alumina refineries where wear is a significant issue. However, recent case studies of failures of white irons in high temperature digestion have suggested that significant corrosion of these materials is occurring and this may be leading to accelerated wear rates. In this paper, the corrosion behavior of a series of high chromium (Cr) white irons in concentrated caustic solutions is studied in the laboratory at temperatures from up to 280°C. The morphology of the oxide films is studied along with corrosion rates measured using weight loss measurements, and this is correlated with compositional and microstructural variations in the white irons. The failure mechanisms of these white irons involve preferential corrosion of the matrix, particularly in circumstances where the matrix is pearlitic. Recommendations regarding the heat treatment and compositions of white irons for use in high temperature digestion are made.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Parent Title

NACE Corrosion 2011 Conference and Expo. High-Temperature Issues and Materials for the Process Industry - TEG 123X/TEG 126X/TEG 128X

Start Page

1

End Page

9

Number of Pages

9

Start Date

01/01/2011

Location

Houston, TX, USA

Publisher

NACE International

Place of Publication

Houston, TX, USA

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Institute for Resource Industries and Sustainability (IRIS); Process Engineering and Light Metals;

Era Eligible

Yes

Name of Conference

NACE Corrosion Conference and Expo