東莞水處理東莞冷卻水處理技術知識（二）（上) - 冷卻塔清洗|板式換熱器清洗|冷凝器清洗|冷凝器通炮|冷凝器保養(yǎng)|中央空調清洗公司-東莞雅昊節(jié)能環(huán)?？萍?- 東莞市雅昊節(jié)能環(huán)?？萍加邢薰?/title> <meta name="keywords" content="x4E45;&" /> <meta name="description" content="x4E45;99&" /> <link href="/statics/css/style.css" rel="stylesheet" type="text/css" /> <link href="/statics/css/animate.css" rel="stylesheet" type="text/css" />  <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body> <h1><a href="http://friendshipcircleavon.com/">国产特级婬片免弗看_欧美5～12牲交_亚洲性视频日韩性视频_国产av福利久久</a></h1><div id="mvqvk" class="pl_css_ganrao" style="display: none;"><form id="mvqvk"></form><form id="mvqvk"><del id="mvqvk"></del></form><meter id="mvqvk"></meter><form id="mvqvk"></form><track id="mvqvk"></track><thead id="mvqvk"></thead><nav id="mvqvk"></nav><strike id="mvqvk"></strike><tbody id="mvqvk"></tbody><abbr 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style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">(一)腐蝕的抑制</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">1、什么是腐蝕？</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">由于和周圍介質相作用，使材料（通常是金屬）遭受破壞或使材料性能惡化的過程稱為腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">2、什么叫做全面腐蝕和局部腐蝕？</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">（1）：在水中金屬的腐蝕是由電化學腐蝕。電化學腐蝕又分為全面腐蝕和局部腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">全面腐蝕相對較均勻，在金屬表面上大量分布著微陰極和微陽極，故這種腐蝕不易造成穿孔，腐蝕產物氧化鐵可在整個金屬表面上形成，在一定情況下有保護作用。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">（2）：當腐蝕集中在金屬表面的某些部位時，則稱為局部腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">局部腐蝕的速度很快，往往在早期就使材料腐蝕穿孔或龜裂，所以危害性很大。垢下腐蝕、縫隙腐蝕、晶間腐蝕等均屬于局部腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">3、什么叫電偶腐蝕？</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">很多生產裝置是由不同的金屬或合金制造而成，這些材料是互相接觸的。由于不同金屬間電位存在著差異，在水溶液（電介質）中形成電偶電池。較活潑的電位較負的金屬是陽極，腐蝕速度要比未偶合時高；電位較正的金屬是陰極受到保護，腐蝕速度下降或停止。在系統中常見的電偶腐蝕有鐵和黃銅、鐵和不銹鋼、鋁和鋼、鋅和銅以及鋅和黃銅等，不論在哪種情況下都是前一種金屬遭到腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">4、什么是縫隙腐蝕？</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">是所謂縫隙腐蝕是金屬表面被覆蓋部位在某些環(huán)境中產生局部腐蝕的一種型式。大量換熱器的腐蝕穿孔，其中主要的是污垢下的腐蝕——縫隙腐蝕的一種類型。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">縫隙腐蝕產生要有以下兩個條件：一是要有危害性陰離子（如CL-）存在；二是要有滯留的縫隙。作為一個腐蝕部位，縫隙如寬度在千分之一英寸（1英寸=25.4mm）以下就會導致腐蝕，寬度在1/8英寸（3.175mm）以上腐蝕很少產生。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:""> </span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">5、什么是點蝕？</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">點蝕過去有稱為坑蝕，孔蝕，但現在比較統一的叫法叫做點蝕。點蝕是一種特殊的局部腐蝕，導致在金屬上產生小孔。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span style="box-sizing:border-box;color:#000000;"><span style="box-sizing:border-box;font-family:"">產生點蝕的原因主要是水中離子和黏泥在金屬表面產生沉積，這些沉積物覆蓋在金屬表面使水中溶解氧和緩蝕劑不能擴散到金屬表面上，從而造成局部腐蝕。</span></span> </p> <p style="box-sizing:border-box;margin-top:0px;margin-bottom:10px;padding:0px;color:#333333;white-space:normal;background-color:#FFFFFF;font-family:Arial, Helvetica, sans-serif;"> <span 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