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Effect of austempering temperature and time on corrosion behaviour of ductile iron in chloride and acidic media

A.S. Afolabi (Department of Civil and Chemical Engineering, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 28 June 2011

545

Abstract

Purpose

The aim of this paper is to study the effect of heat treatment temperature and time on the corrosion behavior of ductile iron in 0.5 M NaCl and 0.5 M H2SO4.

Design/methodology/approach

Ductile iron samples of known composition were austenized at temperatures 800°C and 850°C, and austempered at 300°C and 350°C for periods of 30, 45 and 60 min to convert them to austempered ductile iron (ADI). The corrosion behavior of these ADI samples in 0.5 M NaCl and H2SO4 was measured using the conventional weight loss method. The metallographic examination of the samples was carried out to study the morphology of their corroded surfaces.

Findings

Ductile iron is susceptible to corrosion in both acidic and chloride media, while attack by acid media is mainly at the grain boundaries, that from the chloride is pitting. The corrosion behavior of the material is affected by the compositional structures of the materials as well as the austempering temperature and time it was subjected to.

Practical implications

Ductile iron has the potential to replace costlier materials in many engineering and structural applications.

Originality/value

The results revealed that the corrosion of ADI in both acidic and chloride media were strongly dependent on the structure of the material, which in turn was affected by the austempering temperature and time.

Keywords

Citation

Afolabi, A.S. (2011), "Effect of austempering temperature and time on corrosion behaviour of ductile iron in chloride and acidic media", Anti-Corrosion Methods and Materials, Vol. 58 No. 4, pp. 190-195. https://doi.org/10.1108/00035591111148902

Publisher

:

Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

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