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腐蚀主要成因
作者:管理员    发布于:1970-01-01 07:00:00    文字:【】【】【
<p class=\"MsoNormal\" style=\"margin: 0pt;\"><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><font color=\"#000000\" face=\"宋体\">板式换热器腐蚀主要成因:</font></span><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><!--?xml:namespace prefix = o ns = \"urn:schemas-microsoft-com:office:office\" /--><o:p></o:p></span></p> <p class=\"MsoNormal\" style=\"margin: 0pt;\"><font color=\"#000000\"><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><font face=\"宋体\">(</font>1<font face=\"宋体\">)不锈钢传热板片由机械冲压而成,不可避免地残存一定量的表面残余应力,对于不含钼元素的不锈钢薄板,表面残余应力的消除是很困难的,或者甚至是不可行的。</font></span><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><o:p></o:p></span></font></p> <p class=\"MsoNormal\" style=\"margin: 0pt;\"><font color=\"#000000\"><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><font face=\"宋体\">(</font>2<font face=\"宋体\">)板片组装后形成了多缝隙结构,如板片之间的触点、密封槽底等部位。而缝隙容易造成</font><font face=\"Calibri\">Cl-</font><font face=\"宋体\">的富集,局部富集程度往往远远超过了不锈钢自身抗应力腐蚀的能力。</font></span><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><o:p></o:p></span></font></p> <p class=\"MsoNormal\" style=\"margin: 0pt;\"><font color=\"#000000\"><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><font face=\"宋体\">(</font>3<font face=\"宋体\">)当板片表面的污垢严重时,介 中的腐蚀元素(</font><font face=\"Calibri\">Cl</font><font face=\"宋体\">、</font><font face=\"Calibri\">S </font><font face=\"宋体\">等)可能大量附着于污垢,并在垢底缝隙处富集。</font></span><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><o:p></o:p></span></font></p> <p class=\"MsoNormal\" style=\"margin: 0pt;\"><span style=\'font-family: 宋体; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt;\'><font color=\"#000000\"><font face=\"宋体\">(</font>4<font face=\"宋体\">)密封槽底中的有害元素往往是粘结剂中的 </font><font face=\"Calibri\">Cl </font><font face=\"宋体\">因温度升高温析出来的。如氯丁 胶系列的粘接剂、压缩石棉(含有</font><font face=\"Calibri\">CaCl2</font><font face=\"宋体\">)</font><font face=\"Calibri\">,</font><font face=\"宋体\">往往在水与蒸汽工况条件下,析出的富集</font><font face=\"Calibri\">Cl- </font><font face=\"宋体\">与 </font><font face=\"Calibri\">H+ </font><font face=\"宋体\">形成</font><font face=\"Calibri\">HCl,</font><font face=\"宋体\">使槽底缝隙处发生严重的应力腐蚀开裂。</font></font></span><span style=\'font-family: Calibri; font-size: 10.5pt; mso-spacerun: \"yes\"; mso-bidi-font-family: \"Times New Roman\"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋体;\'><o:p></o:p></span></p><!--EndFragment-->
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