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首页> 外文期刊>Surface & Coatings Technology >Surface alloying of AZ91E alloy by Al-Zn packed powder diffusion coating
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Surface alloying of AZ91E alloy by Al-Zn packed powder diffusion coating

机译：铝锌填充粉末扩散涂层对AZ91E合金的表面合金化

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摘要

A new surface coating technique, namely packed powder diffusion coating (PPDC), for AZ91E magnesium alloy is reported. This new technique uses a powder mixture of aluminium and zinc as diffusion source and produces uniform and thick coatings at temperatures below 420°C. Experimental results showed that zinc in the powder mixture significantly promotes the formation of intermetallic layers on the surface of the magnesium alloy at process temperatures between 350°C and 413°C, which is more than 50°C lower than the previously reported processes. Depending on the temperature and the Zn-content in the powder, X-ray diffraction analysis identified three intermetallic phases and Mg(Al, Zn) solid solution that consist of the surface alloyed layer. The intermetallic compounds are τ-Mg_(32)(Al,Zn)_(49), φ-Al_5Mg_(11)Zn_4 and β-Mg_(17)(Al,Zn)_(12). The hardness of the over 500μm thick surface alloyed layers is up to four times higher than the substrate. Both the β-Mg_(17)(Al,Zn)_(12) phase and the τ-Mg_(32)(Al,Zn)_(49) phase show one to two order magnitude higher corrosion resistance than the α-phase (solid solution) and the φ-Al_5Mg_(11)Zn_4 phase in 5% NaCl solution. A process parameter window for the layer thickness as well as a schematic model for the formation of the layer is proposed. The PPDC process is a promising technique that provides effective protection of AZ91E alloy from both wear and corrosion.
机译：报道了一种用于AZ91E镁合金的新表面涂层技术，即填充粉末扩散涂层（PPDC）。这项新技术使用铝和锌的粉末混合物作为扩散源，并在低于420°C的温度下产生均匀且厚实的涂层。实验结果表明，在350°C至413°C的过程温度下，粉末混合物中的锌显着促进了镁合金表面的金属间层的形成，这比先前报道的过程低了50°C以上。根据温度和粉末中Zn的含量，X射线衍射分析确定了三个金属间相和由表面合金层组成的Mg（Al，Zn）固溶体。金属间化合物为τ-Mg_（32）（Al，Zn）_（49），φ-Al_5Mg_（11）Zn_4和β-Mg_（17）（Al，Zn）_（12）。厚度超过500μm的表面合金层的硬度是基材的四倍。 β-Mg_（17）（Al，Zn）_（12）相和τ-Mg_（32）（Al，Zn）_（49）相均显示出比α相高一到两个数量级的耐腐蚀性（固溶体）和φ-Al_5Mg_（11）Zn_4相在5％NaCl溶液中的溶液。提出了用于层厚度的工艺参数窗口以及用于形成层的示意图。 PPDC工艺是一种有前途的技术，可有效保护AZ91E合金免受磨损和腐蚀。

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