1. 電刷鍍錫目的物

 15Cr11MoVA不銹鋼套筒(tong)是(shi)汽輪(lun)機(ji)組上的(de)(de)重要(yao)(yao)(yao)零(ling)件(jian)。由于它在高溫、高壓下(xia)長期(qi)工作(zuo)，因而要(yao)(yao)(yao)求它的(de)(de)內部(bu)表(biao)(biao)面(mian)和(he)(he)(he)小(xiao)孔(kong)(kong)具(ju)有(you)高強度，高的(de)(de)抗蝕性(xing)(xing)和(he)(he)(he)耐磨性(xing)(xing)，而外部(bu)表(biao)(biao)面(mian)則(ze)要(yao)(yao)(yao)求具(ju)有(you)良(liang)好的(de)(de)可加工性(xing)(xing)。為了(le)滿足(zu)這些要(yao)(yao)(yao)求，對(dui)套筒(tong)內表(biao)(biao)面(mian)和(he)(he)(he)小(xiao)孔(kong)(kong)要(yao)(yao)(yao)進行氮化(hua)處(chu)理(li)，而對(dui)其外部(bu)表(biao)(biao)面(mian)應采取鍍錫防(fang)滲(shen)氮措施。

2. 電(dian)刷鍍錫工藝流程(cheng)

  電(dian)(dian)凈(jing)(jing)（電(dian)(dian)凈(jing)(jing)溶(rong)液(ye)見表(biao)4-42中(zhong)的 1號電(dian)(dian)凈(jing)(jing)液(ye)，工(gong)作(zuo)電(dian)(dian)16V,時間(jian)為電(dian)(dian)凈(jing)(jing)至(zhi)(zhi)表(biao)面(mian)均(jun)勻(yun)潤濕不掛水珠為止）→水沖(chong)洗→活(huo)化（活(huo)化溶(rong)液(ye)成分硫(liu)(liu)酸 80g/L,硫(liu)(liu)酸銨110g/L,電(dian)(dian)壓(ya)為＋12V,反接，即(ji)工(gong)件接正極，鍍(du)(du)筆接負(fu)極，表(biao)面(mian)活(huo)化至(zhi)(zhi)均(jun)勻(yun)淺灰色后，變(bian)電(dian)(dian)壓(ya)為－12V,正接，即(ji)工(gong)件接負(fu)極，表(biao)面(mian)活(huo)化至(zhi)(zhi)均(jun)勻(yun)較深(shen)灰色為止）→水沖(chong)洗→刷鍍(du)(du)錫(xi)(xi)［鍍(du)(du)錫(xi)(xi)溶(rong)液(ye)成分參見4.9.12之（3)，工(gong)作(zuo)電(dian)(dian)壓(ya) 3~7V,溫(wen)(wen)度室溫(wen)(wen)，陽極與(yu)工(gong)件之間(jian)的相對運動速率(lv)為15~16m/min,錫(xi)(xi)層厚度為 6~7μm]→水→中(zhong)和（用(yong)電(dian)(dian)凈(jing)(jing)液(ye)無電(dian)(dian)擦技）→熱水授泡（溫(wen)(wen)度 50℃熱水，時間(jian)5min)→干(gan)燥(zao)→氨(an)化（鍍(du)(du)錫(xi)(xi)后3天內）。

3. 刷鍍錫防滲氮出(chu)現問題，可能原因及(ji)解決辦法見表(biao) 4- 47 。