발간논문

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Vol.38, No.3, 488 ~ 495, 2000
Title
Pesearch Paper / Surface Treatment : Degradation of Thermally sprayed WC-Co Coating on a Pot Roll Used in a Zinc Pot of a Continuous Galvanizing Line
성병근Byeong Geun Seong,황순영Soon Young Hwang,김문철Moon Chul Kim,김규영Kyoo Young Kim
Abstract
Degradation process of WC-Co coating was evaluated through analyses of a coated stabilizing roll used in a molten zinc pot of a CGL(Continuous Galvanizing Line) for 56 days. The roll was coated by high velocity oxygen fuel spraying with the WC-12%Co powder that was produced through sintering and crushing process. According to observation of the coating cross-section with SEM, the Zn and Al diffused into the coating layer with the same depth but the Fe in a zinc bath did not diffuse into the coating. Dross particles deposited on the pot rolls were analyzed to be Fe₂Al_5 by X-ray diffraction pattern analysis. Final reaction products of WC-Co coating with zinc bath have nearly the same chemical compositions as the Fe₂Al_5 dross. This phase acted as a diffusion barrier against Zn, Al and Co diffusion at the interface of molten zinc/spray coating and consequently diffusions of Al and Zn were suppressed in the coating layer under this phase.
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