Evaluation of corrosion behaviour of hot dip Zn and Zn-Al alloy coatings on steel wire using laboratory and field tests

• Main Author: Tevera, Tapiwa
• Other Authors: Knutsen, Robert D
• Format: Dissertation
• Language: English
• Published: University of Cape Town 2015
• Subjects: Materials Engineering
• Online Access: http://hdl.handle.net/11427/13367

Includes bibliographical references. === The use of galvanised coatings on steel for structural ropes, bundles and wires has become standard practice as unprotected steel is prone to corrosion degradation. Galvanised coatings increase the service lifespan of steel by providing barrier and cathodic corrosion protection. Zinc (Zn) and zinc-aluminium (Zn-Al) alloys are the most commonly used metallic coatings on steel wire. Zn-Al coatings outperform Zn coatings, most notably in marine environments, as they combine the highly insulating oxide film associated with Al corrosion and the cathodic protection of Zn to the underlying steel.