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Vol.34, No.2, 279 ~ 286, 1996
Title
Research Paper - Environment - : Effects of Atmospheric Conditions and Chloride Ions on Pin Point Rust in Cold - Rolled Steel Sheets
한상호Sang Ho Han, 정진환Jin Hwan Chung, 곽재현Jai Hyun Kwak
Abstract
Since the pin point rust is the major quality problem of cold rolled steel sheets, the effects of atmospheric conditions and chloride ions on the formation of pin point rust were investigated. To know rust susceptibility, annealed specimens were prepared and placed in the cold rolling plant by everymonth in 1994. Temperature and relative humidity around annealed specimens were continuously measured by using thermohygrograph(model R-704). From the experimental results, the propensity of rust formation was remarkably influenced by absolute humidity which was calculated from the temperature. It was considered that relative humidity was not related to the rust formation When impurities containing water or moisture were deposited on the surface of steel sheets, rust formed preferentially at those sites and then propagated as the form of thin long tubes due to the Cl ions.
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