1. 電凈液成分見表(biao)4-42.


表 42.jpg


2. 電凈液的性質和(he)用(yong)途


 電凈液(ye)都是堿性溶(rong)液(ye)，pH為11~13.溶(rong)液(ye)呈無色透明，手摸有滑(hua)感，-10℃不結(jie)冰。


 電凈液具有(you)較強的去油作(zuo)用(yong)，同時具有(you)輕度的除(chu)氧(yang)化膜作(zuo)用(yong)。


3. 使用方法(fa)


  用鍍(du)筆(bi)蘸上(shang)電凈液(ye)，大型(xing)圓(yuan)柱形工(gong)(gong)件(jian)(jian)夾(jia)在機床車(che)頭上(shang)旋轉(zhuan)，鍍(du)筆(bi)固定在刀架上(shang)不動(dong)，將鍍(du)筆(bi)和工(gong)(gong)件(jian)(jian)接(jie)觸，并保持(chi)一定的相對(dui)運(yun)動(dong)速率(lv)，如果是(shi)平面(mian)工(gong)(gong)件(jian)(jian)，則工(gong)(gong)件(jian)(jian)固定，鍍(du)筆(bi)在工(gong)(gong)件(jian)(jian)平面(mian)上(shang)接(jie)觸，用手(shou)工(gong)(gong)移動(dong)保持(chi)相對(dui)運(yun)動(dong)速率(lv)。在通電的情況下(xia)在工(gong)(gong)件(jian)(jian)表面(mian)涂抹，達到(dao)去(qu)油的目的。


  工(gong)(gong)件(jian)(jian)(jian)與鍍(du)筆之(zhi)間的通(tong)電(dian)(dian)有兩種方式：一種稱(cheng)(cheng)為正(zheng)極(ji)性電(dian)(dian)凈(jing)，工(gong)(gong)件(jian)(jian)(jian)接(jie)負(fu)(fu)極(ji)，鍍(du)筆接(jie)正(zheng)極(ji)，去油效果(guo)快捷。通(tong)電(dian)(dian)時(shi)工(gong)(gong)件(jian)(jian)(jian)表(biao)面產生大量的氫(qing)氣，故工(gong)(gong)件(jian)(jian)(jian)有滲氫(qing)現(xian)象；另一種稱(cheng)(cheng)為反(fan)極(ji)性電(dian)(dian)凈(jing)，工(gong)(gong)件(jian)(jian)(jian)接(jie)正(zheng)極(ji)，鍍(du)筆接(jie)負(fu)(fu)極(ji)，通(tong)電(dian)(dian)時(shi)工(gong)(gong)件(jian)(jian)(jian)表(biao)面產生氧氣，其(qi)去油效果(guo)中等，作用溫和(he)，沒有滲氫(qing)現(xian)象。在實際工(gong)(gong)作中，往往是(shi)采用高檔(dang)電(dian)(dian)壓（10~18V),先正(zheng)極(ji)性電(dian)(dian)凈(jing)后反(fan)極(ji)性電(dian)(dian)凈(jing)聯(lian)合應用，效果(guo)最(zui)佳。


4. 電(dian)凈工藝條件


 電壓10~18V,一(yi)般取12V;時間30~90s;電凈液(ye)溫度 15~50℃。


 電凈后立(li)即用水沖洗干凈，表面(mian)水膜分布均勻，金屬表面(mian)呈(cheng)現(xian)均勻的(de)潔(jie)凈狀態，立(li)即進行下道(dao)工序，不(bu)可使表面(mian)形(xing)成干斑。