Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application

Hot dip galvanizing has been an important technique for corrosion protection in the industry. In recent years, longer service life for hot dip galvanized steel is thus crucial to offset the rapid rises in cost of maintenance in service. This project is aimed to investigate the effects of heat treatm...

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Main Author:	Ooi, Ai Loon
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/53471/25/OoiAiLoonMFKM2014.pdf
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id	my-utm-ep.53471
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spelling	my-utm-ep.534712017-07-20T08:22:24Z Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application 2014-09 Ooi, Ai Loon TJ Mechanical engineering and machinery Hot dip galvanizing has been an important technique for corrosion protection in the industry. In recent years, longer service life for hot dip galvanized steel is thus crucial to offset the rapid rises in cost of maintenance in service. This project is aimed to investigate the effects of heat treatment on the intermetallic and corrosion behaviour of Zn and Zn-0.5%Al coated high carbon steel wire rope for marine application. A total of nine set of heat treatment parameters with heating time one, three and five hours at temperatures 250, 350, 400°C respectively were conducted onto Zn and Zn-0.5%Al coated high carbon steel substrate (0.87%C). These parameters were to evaluate the effects of heat treatment time and temperature on the microstructural evolution and formation kinetics of the coating. The coated steels had undergone corrosion tests namely salt spray test and electrochemical test. The samples before and after corrosion test were analyzed with optical microscopy, scanning electron microscopy, energy dispersive X-ray and X-ray diffractometer The result shows that heat treatment affects the coating thickness and weight loss due to powdering effect. Besides, by increasing heat treatment time and temperature, it was observed that the gamma layer for Zn-coated steel was increased. However, the growth rate of gamma layer for Zn-0.5%Al galvanized wire rope was slow. It was also observed that heat treatment affects the corrosion rate of Zn and Zn-0.5%Al coated samples. The optimum heat treatment parameter for Zn coated samples was heating at temperature 350ºC for 3 hours which gives the lowest corrosion rate. Optimum heat treatment parameter for Zn-0.5%Al coated samples was heating at temperature 400°C for 5 hours. 2014-09 Thesis http://eprints.utm.my/id/eprint/53471/ http://eprints.utm.my/id/eprint/53471/25/OoiAiLoonMFKM2014.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Ooi, Ai Loon Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
description	Hot dip galvanizing has been an important technique for corrosion protection in the industry. In recent years, longer service life for hot dip galvanized steel is thus crucial to offset the rapid rises in cost of maintenance in service. This project is aimed to investigate the effects of heat treatment on the intermetallic and corrosion behaviour of Zn and Zn-0.5%Al coated high carbon steel wire rope for marine application. A total of nine set of heat treatment parameters with heating time one, three and five hours at temperatures 250, 350, 400°C respectively were conducted onto Zn and Zn-0.5%Al coated high carbon steel substrate (0.87%C). These parameters were to evaluate the effects of heat treatment time and temperature on the microstructural evolution and formation kinetics of the coating. The coated steels had undergone corrosion tests namely salt spray test and electrochemical test. The samples before and after corrosion test were analyzed with optical microscopy, scanning electron microscopy, energy dispersive X-ray and X-ray diffractometer The result shows that heat treatment affects the coating thickness and weight loss due to powdering effect. Besides, by increasing heat treatment time and temperature, it was observed that the gamma layer for Zn-coated steel was increased. However, the growth rate of gamma layer for Zn-0.5%Al galvanized wire rope was slow. It was also observed that heat treatment affects the corrosion rate of Zn and Zn-0.5%Al coated samples. The optimum heat treatment parameter for Zn coated samples was heating at temperature 350ºC for 3 hours which gives the lowest corrosion rate. Optimum heat treatment parameter for Zn-0.5%Al coated samples was heating at temperature 400°C for 5 hours.
format	Thesis
qualification_level	Master's degree
author	Ooi, Ai Loon
author_facet	Ooi, Ai Loon
author_sort	Ooi, Ai Loon
title	Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
title_short	Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
title_full	Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
title_fullStr	Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
title_full_unstemmed	Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application
title_sort	effect of heat treatment on the interlayer and corrosion behavior of zn and zn-0.5%al coated high carbon steel for marine application
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/53471/25/OoiAiLoonMFKM2014.pdf
_version_	1747817563371339776

Effect of heat treatment on the interlayer and corrosion behavior of Zn and Zn-0.5%Al coated high carbon steel for marine application

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