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腐蝕主要成因
作者:管理員    發布于:1970-01-01 07:00:00    文字:【】【】【
<p class=\"MsoNormal\" style=\"margin: 0pt;\"><span style=\'font-family: 宋體; 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=\"宋體\">板式換熱器腐蝕主要成因:</font></span><span style=\'font-family: 宋體; 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: 宋體; 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=\"宋體\">(</font>1<font face=\"宋體\">)不銹鋼傳熱板片由機械沖壓而成,不可避免地殘存一定量的表面殘余應力,對于不含鉬元素的不銹鋼薄板,表面殘余應力的消除是很困難的,或者甚至是不可行的。</font></span><span style=\'font-family: 宋體; 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: 宋體; 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=\"宋體\">(</font>2<font face=\"宋體\">)板片組裝后形成了多縫隙結構,如板片之間的觸點、密封槽底等部位。而縫隙容易造成</font><font face=\"Calibri\">Cl-</font><font face=\"宋體\">的富集,局部富集程度往往遠遠超過了不銹鋼自身抗應力腐蝕的能力。</font></span><span style=\'font-family: 宋體; 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: 宋體; 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=\"宋體\">(</font>3<font face=\"宋體\">)當板片表面的污垢嚴重時,介 中的腐蝕元素(</font><font face=\"Calibri\">Cl</font><font face=\"宋體\">、</font><font face=\"Calibri\">S </font><font face=\"宋體\">等)可能大量附著于污垢,并在垢底縫隙處富集。</font></span><span style=\'font-family: 宋體; 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: 宋體; 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=\"宋體\">(</font>4<font face=\"宋體\">)密封槽底中的有害元素往往是粘結劑中的 </font><font face=\"Calibri\">Cl </font><font face=\"宋體\">因溫度升高溫析出來的。如氯丁 膠系列的粘接劑、壓縮石棉(含有</font><font face=\"Calibri\">CaCl2</font><font face=\"宋體\">)</font><font face=\"Calibri\">,</font><font face=\"宋體\">往往在水與蒸汽工況條件下,析出的富集</font><font face=\"Calibri\">Cl- </font><font face=\"宋體\">與 </font><font face=\"Calibri\">H+ </font><font face=\"宋體\">形成</font><font face=\"Calibri\">HCl,</font><font face=\"宋體\">使槽底縫隙處發生嚴重的應力腐蝕開裂。</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: 宋體;\'><o:p></o:p></span></p><!--EndFragment-->
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