1. 電(dian)凈(jing)液成分見(jian)表(biao)4-42.


表 42.jpg


2. 電凈液的性質和用途


 電凈液都是(shi)堿性溶液，pH為11~13.溶液呈無色(se)透明，手摸有滑感，-10℃不(bu)結冰(bing)。


 電凈液具有(you)較強的(de)去(qu)油作(zuo)(zuo)用，同時具有(you)輕度(du)的(de)除氧化(hua)膜作(zuo)(zuo)用。


3. 使用方法


  用(yong)鍍(du)筆(bi)(bi)蘸上電凈液(ye)，大型圓柱形工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)夾(jia)在(zai)機床車頭(tou)上旋轉(zhuan)，鍍(du)筆(bi)(bi)固定(ding)在(zai)刀架上不動(dong)，將(jiang)鍍(du)筆(bi)(bi)和工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)接(jie)觸，并保持一定(ding)的(de)(de)相(xiang)對(dui)運(yun)動(dong)速率，如果是平(ping)面(mian)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)，則工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)固定(ding)，鍍(du)筆(bi)(bi)在(zai)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)平(ping)面(mian)上接(jie)觸，用(yong)手(shou)工(gong)(gong)(gong)(gong)移動(dong)保持相(xiang)對(dui)運(yun)動(dong)速率。在(zai)通電的(de)(de)情況下在(zai)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)表面(mian)涂抹，達到去油(you)的(de)(de)目的(de)(de)。


  工(gong)(gong)(gong)件與鍍(du)筆之間的通電(dian)有(you)兩種(zhong)(zhong)方式：一種(zhong)(zhong)稱為正極(ji)(ji)性電(dian)凈(jing)，工(gong)(gong)(gong)件接(jie)負極(ji)(ji)，鍍(du)筆接(jie)正極(ji)(ji)，去油效果快捷。通電(dian)時工(gong)(gong)(gong)件表面產(chan)生大量(liang)的氫氣，故工(gong)(gong)(gong)件有(you)滲氫現象；另一種(zhong)(zhong)稱為反極(ji)(ji)性電(dian)凈(jing)，工(gong)(gong)(gong)件接(jie)正極(ji)(ji)，鍍(du)筆接(jie)負極(ji)(ji)，通電(dian)時工(gong)(gong)(gong)件表面產(chan)生氧(yang)氣，其去油效果中(zhong)等，作用(yong)溫和(he)，沒(mei)有(you)滲氫現象。在實際工(gong)(gong)(gong)作中(zhong)，往往是采用(yong)高檔電(dian)壓（10~18V),先正極(ji)(ji)性電(dian)凈(jing)后反極(ji)(ji)性電(dian)凈(jing)聯合應用(yong)，效果最(zui)佳。


4. 電(dian)凈工藝條件


 電壓10~18V,一般取12V;時間30~90s;電凈液溫度 15~50℃。


 電凈后立即用水沖洗干(gan)(gan)凈，表面(mian)(mian)水膜分布均(jun)勻，金屬表面(mian)(mian)呈(cheng)現(xian)均(jun)勻的潔凈狀態，立即進行下道工序，不可使表面(mian)(mian)形成(cheng)干(gan)(gan)斑。