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The effect of thermal heat treatment on the corrosion performance of some commercial and advanced magnesium alloys. / Sri Naga Pavan Addepalli

Swansea University Author: Sri Naga Pavan Addepalli

Abstract

"The research titled "The effect of thermal heat treatment on the corrosion performance of some commercial and advanced magnesium alloys" deals with the use of heat treatment to change the characteristics of some commercial magnesium alloys. The alloys were first subjected to homogene...

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Published: 2011
Institution: Swansea University
Degree level: Master of Philosophy
Degree name: M.Phil
URI: https://cronfa.swan.ac.uk/Record/cronfa42579
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Abstract: "The research titled "The effect of thermal heat treatment on the corrosion performance of some commercial and advanced magnesium alloys" deals with the use of heat treatment to change the characteristics of some commercial magnesium alloys. The alloys were first subjected to homogeneous solution treatment and quenched in cold water in order to retain the homogeneous state of the material. Then the samples were aged at temperatures as suggested in the literature for different time periods. Their corrosion performance was then assessed using Time lapse photography, Hydrogen evolution experiment and Scanning Vibrating Electrode Technique (SVET). The data obtained from the time lapse photography was assessed using Sigma plot to characterize the corroded rate in terms of area (m.;2) over a period of time. The bulk corrosion rates by the amount ofhydrogen released was estimated volumetrically over a period of time. Finally the data obtained form the SVET analysis was assessed using Surfer to acquire the local current density rates due to corrosion. From the current density data, the approximate loss of material during SVET was estimated quantitatively. This thesis compares three different magnesium alloys, AZ31, AZ91 and Elektron 21 (E21). It was noticed that heat treatment changed the microstructural characteristics of the alloys which in turn affected the corrosion performance of those alloys. The results show that solution treatment was preferred for AZ31 and Elektron 21 alloy and age hardening for AZ91 alloy. It was also noticed that all the results obtained using various experimental techniques were similar to each other."
Keywords: Materials science.
College: Faculty of Science and Engineering

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