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Corrosion Behavior and Crystal Structure of Zn-Cr Coatings by EB-PVD and Electroplating  

최한철 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터)
Publication Information
Journal of the Korean institute of surface engineering / v.36, no.6, 2003 , pp. 423-429 More about this Journal
Abstract
It has been investigated corrosion resistance and crystal structure of Zn-Cr coatings fabricated by electroplating method and electron-beam physical vapor deposition method(EB-P VD). The electroplated Zn-Cr alloy consists mainly of η'-Zn phase for the lower Cr content than 7.9 wt% Cr and ${\gamma}$'-ZnCr phase for the higher Cr content. In the Zn-Cr alloy fabricated by EB-PVD the ${\gamma}$'-ZnCr phase appeared clearly at 3 wt% Cr and it became the sole phase at 50 wt%Cr. The amount of η'-Zn phase decreased obviously with increasing Cr content when it exceeded 15 wt% Cr. The electrochemical measurement of the electroplated Zn-Cr film has shown corrosion potential of about -1000 mV. The current density of active region and the amount of dissolved Zn and Cr decreased significantly with increasing Cr content. The electrochemical characteristics of Zn-Cr alloy fabricated by EB-PVD have shown that the alloy of 50 wt% Cr had the highest corrosion potential(-500 mV) and the lowest critical passive current density than that of the electroplated.
Keywords
Zn-Cr coating; Corrosion resistance; EB-PVD; Electroplating;
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