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 <h1 class="p15-infocontent-1-tit">  热浸镀锌时镀层的形成  </h1> 
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  <span>  发布日期：   2021.12.28  </span> 
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 <div class="p15-infocontent-1-con endit-content"><p align="justify" class="MsoNormal img-block" style="text-align:center;">
    <img align="" alt="热浸镀锌时镀层的形成" src="/resource/images/9227cee479b84212a0004cb631121b22_4.jpg" title="热浸镀锌时镀层的形成" width="500">
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<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    &nbsp;<span>钢带在<a class="attach inline_attach" href="http://www.desytek.com/product/passivant.html" target="_blank" title="镀锌">镀锌</a>前必须满足三个基本条件：一是钢带表面的油污被清洗干净，二是钢带表面的氧化物被还原成海绵铁，三是钢带在炉内被加热并冷却到与锌锅基本相同的温度。之后，钢带进入锌液，开始进行一系列反应。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>1.</span><span>钢带进入锌液以后很快与锌液之间发生热交换，最终使钢带与锌液温度基本一致。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>2.</span><span>钢带首先与锌液中的铝发生反应，形成</span><span>Fe2Al5</span><span>中间化合物层，并达到一定的厚度。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>3.</span><span>铁原子扩散到锌液中，使钢带表面附近的锌液中的铁浓度升高，由于中间化合物的阻碍作用，其扩散速度受到很大的限制。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>4.</span><span>当钢带表面附近的锌液中铁的浓度超过其溶解度时，便从</span><span>Fe2Al5</span><span>膜上开始形成铁锌化合物，并长大到一定的厚度。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>5.</span><span>钢带离开锌锅，在气刀的作用下刮去多余的锌液，温度开始下降。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>6.</span><span>液态镀层在</span><span>419</span><span>度左右时凝固，结晶，并在其表面形成一层致密的氧化铝为主的保护膜。</span>
</p>
<p align="justify" class="MsoNormal" style="text-indent:14.0000pt;text-align:justify;">
    <span>7.</span><span>镀层在固态下继续冷却，并经水淬以后成为常温下的镀层。</span>
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