Electrochemical corrosion studies on coated sheet steel
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Authors
Nair, N. Ramachandran
Issue Date
1982
Type
Thesis
Language
en_US
Keywords
zinc-coated steels , zinc-alloy coated steels , sodium chloride solution , galvanic coupling , substrate steel , corrosion rate of coating , dissolved oxygen , coated sheet steels , electrochemical corrosion , electrochemical corrosion studies , Mackay Science Project
Alternative Title
Abstract
The corrosion of zinc- and zinc- alloy coated steels was measured by electrochemical methods in 0.1 N and 1.0 N sodium chloride solution. The purpose was to develop improved testing methods for quality control and development of improved coatings. In order to study the effect of galvanic coupIing between coating and substrate steel, a scribe was machined in the coating to expose the steel which, in turn, was exposed to electrolyte. The purpose was to simulate service conditions wherein coating may be mechanically damaged. It was found that corrosion rate of coating, regardless of composition, increased in deaerated solutions. In solutions containing dissolved oxygen this was not always the case because of the non - reproducibility of migration of dissolved oxygen to corroding surface. Although it was difficult to distinguish between pure zinc coatings, demarcation between pure zinc- and alloy- coatings was possible.
Description
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Citation
Publisher
University of Nevada, Reno
License
In Copyright(All Rights Reserved)