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http://dx.doi.org/10.14773/cst.2013.12.6.288

Steel Surface Uniformity Assesment Method for Electrocoating by Applying Low Current and Voltage  

Yang, Wonseog (Hyundai-Steel R&D Center)
Lee, Changyong (School of Materials Science and Engineering, Inha University)
Jung, Yudong (School of Materials Science and Engineering, Inha University)
Moon, Manbeen (School of Materials Science and Engineering, Inha University)
Hwang, Woonsuk (Hyundai-Steel R&D Center)
Publication Information
Corrosion Science and Technology / v.12, no.6, 2013 , pp. 288-294 More about this Journal
Abstract
When the automotive body enters an electrocoating tank while applying an electric current, its steel surface is exposed to a very low induced current. Consequently, surface defects of coating may arise if the steel surface has lack of electric uniformity due to local defects such as local oxide. In this study, we investigated the preceding assessment methods to evaluate steel susceptibility of the low induced current during electrocoating before mass production. Prior to general electrocoating, we applied low constant voltage such as 3V or low constant current densities such as $0.35mA/cm^2$ and $0.50mA/cm^2$. In result, we confirmed that such methods were efficient for assessing steel susceptibility of low induce current during electrocoating.
Keywords
cataphoretic electrocoat; coating defect; surface defect analysis; current analysis; contact angle;
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