<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">

Mg對Zn—11% Al合金鍍層凝固組織及合金層生長的影響

Effect of Mg on the solidification structure and growth of the intermetallic layer of a Zn-11% Al alloy coating

  • 摘要: 將工業純鐵分別在510℃的Zn-11% Al、Zn-11% Al-1.5% Mg、Zn-11% Al-3% Mg和Zn-11% Al-4.5% Mg合金熔池中進行不同時間的熱浸鍍,使用X射線衍射儀、掃描電子顯微鏡、能譜儀等儀器設備,研究Mg含量對Zn-11% Al合金鍍層凝固組織和鍍層中Fe-Al合金層生長的影響.結果表明:Zn-11% Al合金鍍層凝固組織由富Al相和Zn/Al二元共晶組成;隨著Zn-11% Al-x% Mg合金中Mg含量的增加,合金鍍層的凝固組織中逐漸出現Zn/Al/MgZn2三元共晶、塊狀MgZn2相和Al/MgZn2二元共晶.四種合金鍍層中合金層主要由Fe2Al5Znx和FeAl3Znx相組成,合金層的厚度隨浸鍍時間的增加而增加,Mg含量的增加使Fe-Al合金層生長速率指數和生長速率降低.在Zn-11% Al合金鍍層中Fe-Al合金層形成的初期,可形成致密穩定的Fe-Al化合物層;熱浸鍍120 s后,擴散通道的移動使Fe-Al化合物層失穩破裂.Zn-11% Al-x% Mg合金中Mg元素可明顯推遲液Zn進入鍍層中Fe-Al合金層的時間,使Fe-Al合金層更加穩定和致密.

     

    Abstract: Zn-11%Al, Zn-11%Al-1.5%Mg, Zn-11%Al-3%Mg and Zn-11%Al-4.5%Mg alloy coatings were obtained by dipping pure iron in the alloy bath at 510℃ for different immersion time. The effects of Mg content on the solidification structure of the Zn-11% Al coating and the growth of the Fe-AI intermetallic layer in the alloy coating were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry. The results show that the solidification microstructure of the Zn-11% Al alloy coating is composed of Al-rich phase and Zn/Al ternary eutectic. With the increase of Mg content in the Zn-11% Al-x% Mg alloy, Zn/Al/MgZn2 ternary eutectic, blocky MgZn2 phase and AL/MgZn2 binary eutectic occur gradually. The intermetallic layers in the Zn-11% Al alloy coatings with different amounts of Mg consist of Fe2Al5Znx phase and FeAl3Znx phase, and the thickness of the inter-metallic layer increases with the prolongation of immersion time. The increase of Mg content in the hot dip bath reduces the growth-rate index and the growth rate of the intermetallic layer. At the beginning of the hot dip process, a compact and stable Fe-Al alloy layer in the Zn-11% Al alloy coating form on the iron surface. After immersing for 120 s, the Fe-Al intermetallic layer is instable and broken because of diffusion path movement. Mg element in the Zn-11% Al-x% Mg alloy can significantly delay the time of liquid zinc into the Fe-Al alloy layer, which makes the Fe-Al alloy layer be more stable and compact.

     

/

返回文章
返回
<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">
259luxu-164