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電泳涂裝用去離子水簡(jiǎn)介中英對(duì)照版

1336 人參與 2011年11月24日 01:00 分類 : 電泳工藝電泳原理評(píng)論

?Deionized Water去離子水

Deionization is a process by which tap or raw water is made suitable for use in an electrocoat bath. Deionization is far more economical than distillation or reverse osmosis in commercial operations. 去離子水是一種將自來(lái)水或生水經(jīng)處理后制成適合配電泳漆槽液用的水。去離子工藝在工業(yè)成本方面遠(yuǎn)比蒸餾水或反滲透水經(jīng)濟(jì)得多。 Distillation is achieved by boiling and then recondensing water to remove insoluble contaminants; reverse osmosis uses a membrane separation process to accomplish the same purpose. 蒸餾是把水煮沸然后冷凝除去不溶性雜質(zhì)；反滲透是使用膜分離工藝達(dá)到同樣的目的。 Deionization removes ionizable minerals from tap water by passing the water through ion-exchange beds. Both a strong acid cation bed and a strong base anion bed are required to remove all of the ions in the water. 去離子是使自來(lái)水通過(guò)離子交換柱除去可離子的礦物質(zhì)。此工藝需同時(shí)使用一強(qiáng)酸性陽(yáng)離子交換柱和一強(qiáng)堿性陰離子交換柱以除去水中所有離子。 During the first step of the deionization process, cations (such as calcium, magnesium, and sodium) are exchanged for hydrogen ions. During the second step, the anions (such as chloride, sulphate, and silica) are exchanged for hydroxide ions. The hydrogen and hydroxl ions combine to form water (H2O).? Factors such as the chemical composition of the incoming water, temperature, and operating pressure all play a role in determining how well the ions will exchange. 在去離子的第一步，陽(yáng)離子（例如鈣，鎂，鈉）被H+ （氫離子）置換，第二步，陰離子（例如氯化物，硫酸鹽，二氧化硅）都被OH－（氫氧根離子）置換，?? H＋和OH－結(jié)合生成水。（HO）。進(jìn)水的化學(xué)成分，溫度，操作壓力等因素是離子交換工藝中的重要參數(shù)。 Over a period of years, a standard has been developeｄ　regarding the required purity of water used in an electrocoat system. These standards have been mutually developed by the paint manufacturers and the end users. 多年前，關(guān)于電泳漆系統(tǒng)用水的純度的標(biāo)準(zhǔn)已被定出，而這些標(biāo)準(zhǔn)是由油漆制造廠和最終用戶共同開(kāi)發(fā)和訂立的。 The standard water purity for present cationic paint systems is 10 micromhos or 100,000 ohms. The ohm is a unit of resistance; the mho is a measure of conductance. (Mho is simply Ohm spelled backwards.) If the water quality rises above 25 micromhos, paint contamination may occur. Water that is less than 25 micromhos will cause no problem nor will it enhance the system operation. 目前，對(duì)陽(yáng)離子漆（陰極電泳漆）系統(tǒng)的水純度標(biāo)準(zhǔn)是10微姆歐或100000歐姆，歐姆是一個(gè)電阻單位，姆歐是導(dǎo)電性的計(jì)量單位（姆歐是歐姆的簡(jiǎn)單倒拼）。如果水質(zhì)的電導(dǎo)率大于25 微姆歐，槽液可能被污染。水質(zhì)低于25 微姆歐就不會(huì)引起什么問(wèn)題，但也不會(huì)提供系統(tǒng)的水平。 Deionized water is used in electrocoat tanks to prevent paint contamination. The presence of mineral contaminants causes two problems: 為了防止漆液被污染，電泳槽中要用去離子水。無(wú)機(jī)雜質(zhì)會(huì)引起兩個(gè)問(wèn)題： Minerals present during electrocoating affect appearance and corrosion resistance. 在電泳過(guò)程中無(wú)機(jī)物的存在會(huì)影響涂膜的外觀和抗腐蝕性。 Disassociated minerals have an electrical charge. They migrate and consume current which could be used for paint deposition. Because pure water is a good solvent, it is used for bath make-up, for final rinsing? of the electrocoat film, and after the phosphate machine to remove pretreatment contamination. 游離的無(wú)機(jī)物帶電荷，它們泳動(dòng)并消耗用于涂漆的電能。因?yàn)榧兯橇己玫娜軇?，所以?用于電泳槽液的配制，電泳涂膜的最終淋洗及磷化后除去前處理殘留物 The ability of a deionizer to exchange ions is reduced with continued operation,? and a point is reached where it finally becomes exhausted. When this point is reached, it can be regenerated with strong acid and strong base. Hydrochloric acid (HCl) and liquid sodium hydroxide (NaOH) are the preferred materials for such use. Flake sodium hydroxide should not be used because it causes valve plugging. After the bed is regenerated, all acid and base (even trace amounts) must be flushed from the system. Any remaining acid or base materials will have a devastating effect on the electrocoat bath. 離子交換的能力會(huì)隨連續(xù)運(yùn)行而降低，最后達(dá)到失效點(diǎn)。這時(shí)，可用強(qiáng)酸和強(qiáng)堿再生。為此，鹽酸（HCL）和氫氧化鈉（NaOH）溶液是推薦選用的材料，決不能用片狀NaOH, 因?yàn)樗鼤?huì)引起閥門堵塞。交換柱再生之后，必須將所有的酸，堿（即使是微量）從系統(tǒng)中沖洗干凈。任何殘留的酸堿，將對(duì)電泳槽液有破壞性影響。

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