重慶恒諾水處理設備有限公司從事水處理事業十一年，已成為純水、超純水設備，實驗室超純水設備，工業電子級超純水設備,實驗室廢水系統，礦用超純水處理設備，純水超純水處理系統線上線下維護維修的專業生產廠家，以客戶(hu)需求為中心，致力于為客戶(hu)創造價值，提供最(zui)優質(zhi)最(zui)實(shi)惠(hui)的水(shui)處理解(jie)決方案(an)，天分享(xiang)：

水處理中什(shen)么是點(dian)蝕?

點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)過去有(you)(you)稱為坑蝕(shi)(shi)(shi)(shi)(shi)(shi)、孔(kong)蝕(shi)(shi)(shi)(shi)(shi)(shi)，但現(xian)在(zai)(zai)比較統一的(de)叫法稱點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)是一種特殊的(de)局(ju)部(bu)腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi)，導致在(zai)(zai)金屬上產(chan)生小孔(kong)。若用(yong)P表(biao)(biao)(biao)示腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi)孔(kong)的(de)深度，d表(biao)(biao)(biao)示腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi)孔(kong)的(de)寬度，當P/d<1時稱為局(ju)部(bu)腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi);當P/d>1時稱為點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)。產(chan)生點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)的(de)原(yuan)因(yin)主要是水(shui)中(zhong)離子或黏泥在(zai)(zai)金屬表(biao)(biao)(biao)面產(chan)生沉積(ji)，這些(xie)沉積(ji)物覆蓋在(zai)(zai)金屬表(biao)(biao)(biao)面使水(shui)中(zhong)溶解氧和(he)緩(huan)蝕(shi)(shi)(shi)(shi)(shi)(shi)劑不能擴散到金屬表(biao)(biao)(biao)面上，從而(er)造成局(ju)部(bu)腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi)。水(shui)中(zhong)C對(dui)點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)也(ye)有(you)(you)影響，點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)傾向(xiang)隨著Cl-濃度的(de)升(sheng)(sheng)高(gao)而(er)增(zeng)加。溫度對(dui)點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)影響較大(da)，升(sheng)(sheng)高(gao)溫度會使鈍化(hua)膜的(de)保(bao)護性能下降，還可能導致應(ying)力(li)腐(fu)蝕(shi)(shi)(shi)(shi)(shi)(shi)開裂。因(yin)此(ci)，點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)經常(chang)發(fa)(fa)(fa)生在(zai)(zai)換(huan)熱(re)器的(de)高(gao)溫區和(he)流速緩(huan)慢發(fa)(fa)(fa)生沉積(ji)的(de)部(bu)位，增(zeng)加水(shui)的(de)流速有(you)(you)利(li)于氧的(de)擴散，有(you)(you)利(li)于鈍化(hua)膜的(de)修補，而(er)且亦可帶走小孔(kong)上的(de)沉積(ji)物，有(you)(you)利(li)于控制(zhi)點(dian)(dian)(dian)蝕(shi)(shi)(shi)(shi)(shi)(shi)的(de)發(fa)(fa)(fa)生。

點蝕(shi)是(shi)(shi)潛伏性(xing)(xing)和破(po)壞性(xing)(xing)最大的一(yi)種腐(fu)蝕(shi)類(lei)型。點蝕(shi)都是(shi)(shi)大陰極(ji)小(xiao)(xiao)陽極(ji)，有(you)自(zi)催化(hua)特(te)性(xing)(xing)。小(xiao)(xiao)孔內腐(fu)蝕(shi)，使(shi)小(xiao)(xiao)孔周(zhou)圍(wei)受到(dao)陰極(ji)保護。孔越(yue)(yue)小(xiao)(xiao)，陰、陽極(ji)面積比越(yue)(yue)大，穿孔越(yue)(yue)快。點蝕(shi)發(fa)生有(you)時往(wang)往(wang)是(shi)(shi)在材(cai)料(liao)的一(yi)側開(kai)始，在另一(yi)側擴大穿孔，使(shi)得檢測很困難(nan)。由(you)工占蝕(shi)極(ji)強的破(po)壞性(xing)(xing)，現在已愈來愈引起人們的重視。

本文由恒諾超純水小編整理(li)，希望對你有所幫助(zhu)