A study on the Silicon reactivity in the galvanizing

Acta Metall Sin

2008, Vol. 44

Issue (6): 718-722 DOI:

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A study on the Silicon reactivity in the galvanizing

SU Xu-Ping;Zhi LI;Fucheng YIN;Shiwen Pan

湘潭大学机械工程学院;材料设计及制备技术湖南省重点实验室

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SU Xu-Ping; Zhi LI; Fucheng YIN; Shiwen Pan. A study on the Silicon reactivity in the galvanizing. Acta Metall Sin, 2008, 44(6): 718-722 .

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Abstract According to the thermodynamic calculation of the Zn-Fe-Si ternary phase system and experimental investigation, the chemical potential of Si increases greatly with the Zn content. So the Si in the coating trends to gather in the high Fe content phases such as the  phase near the / phase boundary, the phase boundary of the  /  layer and the crystal boundary of the  phase. A model was proposed. In galvanizing, diffusion path in coating becomes Si rich, Si concentration in the crystal boundary of the  increases. Diffusion path cut the Tieline of the +Liquid Zn phase equilibrium, and liquid phase appears in the crystal boundary of  phase. Liquid channels Crosse the  layer, connect with the outside liquid Zn. Liquid channel also contacts with the  phase. The Diffuse- (cracked  phase+Liquid Zn) region forms. Since the liquid attacks substrate directly, the growth of coating is reaction controlled. The coating grows linearly.

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Received: 12 September 2007

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