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         <h1>达克罗的涂覆工艺的步骤</h1> 
         <span class="chuchu">文章出处：公司新闻 </span> 
         <span class="bianji">责任编辑：kefu</span> 
         <span class="shijian">发表时间：2022-11-26</span> 
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						<p>涂覆作业的目的是要让工件的表面均匀地涂上一层达克罗涂层；要使涂层在工件的各处均能达到厚薄均匀一致,涂层厚了既浪费涂液,又影响涂覆的表面质量,所以不论采用何种方式进行涂覆；均要设法使涂液在工件的表面均匀地分布。达克罗的涂覆工艺，按涂履方式不同分为浸涂甩干、喷涂、刷涂等几种方法，一起详细了解一下吧。</p>
<p>一、预处理</p>
<p>1、除油：</p>
<p>分有机溶剂(如三氯乙烯等)和碱性溶液除油。经过前处理的零件表面要求能够被水完全浸润。重油工件一般先采用联合清洗机高压清洗，或采用二氯甲烷超声波清洗工艺，再进行喷丸处理。油污较少的工件可以省去清洗这步，直接抛丸处理。</p>
<p>2、喷砂、除尘和降温：</p>
<p>抛丸机使用的钢丸的直径范围为0.1-0.6mm，用压缩空气除尘，除去的粉尘经专门的集粉器收集后集中处理，经抛丸除尘后的零件温度高达60℃左右,待降至20℃时方可进行下道工序。</p>
<p>二、达克罗处理</p>
<p>1、浸涂甩干：</p>
<p>适用于标准件和其它小的工件，工件一般要浸液十到二十秒，为使六价铬和钢铁基材充分形成纯化膜；离心甩干时要正转反转各两次，每次十到二十秒，对于特殊件要用夹具，难甩的零件要用人工辅助，比如用棒在离心筐中搅一下，且转速要快，总之是要保证零件上不能有积液、挂液、气泡、漏涂等。通过多次正反转甩液、多次调整甩干速度，根据实际上的涂覆效果定最后的工艺参数。</p>
<p>2、喷涂、刷涂：</p>
<p>一般用于大件，用于难浸涂、难离心甩干的零件。喷涂的涂层均匀，涂层较厚，结合力差但光洁度好，抗腐蚀性强但效率低，施工中要注意安全，喷涂时浆液的粘度要适当的降低。</p>
<p>3、固化：</p>
<p>经达克罗液浸渍处理后的工件经甩干，放置于不锈钢网带输送带上，对小的工件，需带上手套，进行人工分理，要求工件间不互相粘连。对于较大的工件，例如地铁螺栓，须放置在专门的料架上，再将料架放在网带上入固化炉烘烤固化。固化温度为：280-330℃，时间25-40分钟。固化分为两个阶段：在第一阶段中工件吸热升温，称为预热，温度控制在60～80℃、10分钟。此阶段中须注意升温不可过急，应让工件缓缓吸热，让涂层中的水份逐渐逸出，以避免涂层起泡，产生缺陷。第二阶段为涂层的高温固化，此时固化炉中的温度一定要控制在工艺要求的范围内，不可过高或过低，因为它决定了涂层在工件上的最终性能。</p>
<p>4、冷却：</p>
<p>由于固化的温度较高，须对固化好后的工件进行强冷，以缩短冷却的时间，减小固化炉的长度，节省投资费用。</p>
<p>5、后处理：</p>
<p>当涂层较厚时，会因为涂层固化前不易流平或工件形状的原因造成甩干时涂膜不均匀。固化后出现外观粗糙、粉化的现象。这时需要对工件表面作少许修正，常用的方法是：用优质的硬毛刷清理工件表面。</p>
<p>以上就是关于达克罗的涂覆工艺的步骤的讲解，看完大家都明白了吗，希望对大家有所帮助。</p>
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        18398888268 
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