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 <h1 class="p15-infocontent-1-tit">  钢管热镀锌层外观检查和处理方法有哪些？  </h1> 
 <div class="p15-infocontent-1-bool"> 
  <i><a href="/article/Information.html" title="返回列表">  返回列表 </a></i> 
  <span>  来源：  
       
    </span> 
  <span>  发布日期：   2018.01.25  </span> 
 </div> 
 <div class="p15-infocontent-1-con endit-content"><p class="img-block">
    <img align="center" alt="圆管" src="/resource/images/9d36f02807124034b5a51d9ebbc88a06_3.jpg" title="圆管">
</p>
<p>
    1.镀层缺陷—灰暗镀层
</p>
<p>
    原因：
</p>
<p>
    1）钢材成分问题（高硅、磷和碳）；
</p>
<p>
    2）热镀锌后冷却速度太慢；
</p>
<p>
    3）热镀锌层凝固时释放出吸入的氢气。
</p>
<p>
    是否拒收及其理由：如果钢材成分有问题，仅局限于局部面积，按时限协议约定处理，一般不应拒收。
</p>
<p>
    <br>
</p>
<p>
    2.镀层缺陷—表面粗糙
</p>
<p>
    原因：
</p>
<p>
    1）要进行原材料钢材的化学成分分析是否过度酸洗；
</p>
<p>
    2）热镀锌也温度较高，或热镀锌时间过长。
</p>
<p>
    是否拒收及其理由：一般不应拒收，除非有事先的约定。
</p>
<p>
    <br>
</p>
<p>
    3.镀层缺陷—漏镀
</p>
<p>
    原因：
</p>
<p>
    1）工件表面残留油漆，油脂；
</p>
<p>
    2）工件表面残留有氧化皮，铁锈；基体钢材的轧制缺陷；3）锌液中含铝含量过高，溶剂浓度过低。
</p>
是否拒收及其理由：一般给予拒收，除非漏铁处面积很小，易于修补。<br>
<br> 4.镀层缺陷—锌渣粒子
<br> 原因：加入锌渣微粒。
<br> 是否拒收及其理由：不应拒收，除非锌渣粒子特别严重。
<br>
<br> 5.镀层缺陷—锌瘤和锌的流痕
<br> 原因：镀锌后钢管外吹不好，气压低，锌液温度过低。
<br> 是否拒收及其理由：只能根据事先约定。
<br>
<br> 6.镀层缺陷—溶剂夹杂
<br> 原因：热浸锌时反应的溶剂残渣在热镀锌层表面
<br> 是否拒收及其理由：一般拒收，除非溶剂渣已经排除。
<br>
<br> 7.镀层缺陷—加灰
<br> 原因：从锌液面上黏上的锌灰，或反应不完全。
<br> 是否拒收及其理由：如锌灰结块大，可拒收。
<br>
<br> 8.镀层缺陷—白锈
<br> 原因：在潮湿环境下，密封严实，或在潮湿的环境下长期存放。
<br> 是否拒收及其理由：不应拒收，除非在储运前已经发生。
<br></div> 
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