1. 電刷鍍錫目的(de)物

 15Cr11MoVA不(bu)銹鋼套(tao)筒是汽輪機(ji)組上的重要(yao)(yao)零件。由(you)于(yu)它(ta)在高(gao)溫、高(gao)壓下長期(qi)工作，因(yin)而(er)(er)要(yao)(yao)求(qiu)它(ta)的內部(bu)表(biao)面(mian)和小孔(kong)(kong)具有高(gao)強度，高(gao)的抗(kang)蝕性(xing)(xing)和耐磨性(xing)(xing)，而(er)(er)外(wai)部(bu)表(biao)面(mian)則要(yao)(yao)求(qiu)具有良好的可加(jia)工性(xing)(xing)。為了滿足這些要(yao)(yao)求(qiu)，對(dui)套(tao)筒內表(biao)面(mian)和小孔(kong)(kong)要(yao)(yao)進行氮化處理，而(er)(er)對(dui)其外(wai)部(bu)表(biao)面(mian)應采取鍍錫防滲氮措施。

2. 電刷鍍錫工藝流程

  電(dian)(dian)(dian)凈(jing)(jing)（電(dian)(dian)(dian)凈(jing)(jing)溶液(ye)(ye)見表(biao)4-42中的(de) 1號電(dian)(dian)(dian)凈(jing)(jing)液(ye)(ye)，工(gong)(gong)作電(dian)(dian)(dian)16V,時間為(wei)(wei)電(dian)(dian)(dian)凈(jing)(jing)至(zhi)(zhi)表(biao)面(mian)均(jun)勻潤濕不掛水(shui)珠為(wei)(wei)止）→水(shui)沖(chong)洗→活化(hua)(hua)（活化(hua)(hua)溶液(ye)(ye)成(cheng)分(fen)硫(liu)酸 80g/L,硫(liu)酸銨110g/L,電(dian)(dian)(dian)壓(ya)(ya)為(wei)(wei)＋12V,反接(jie)，即工(gong)(gong)件接(jie)正(zheng)極，鍍筆接(jie)負極，表(biao)面(mian)活化(hua)(hua)至(zhi)(zhi)均(jun)勻淺灰色(se)后(hou)，變電(dian)(dian)(dian)壓(ya)(ya)為(wei)(wei)－12V,正(zheng)接(jie)，即工(gong)(gong)件接(jie)負極，表(biao)面(mian)活化(hua)(hua)至(zhi)(zhi)均(jun)勻較深灰色(se)為(wei)(wei)止）→水(shui)沖(chong)洗→刷(shua)鍍錫［鍍錫溶液(ye)(ye)成(cheng)分(fen)參見4.9.12之（3)，工(gong)(gong)作電(dian)(dian)(dian)壓(ya)(ya) 3~7V,溫(wen)度室(shi)溫(wen)，陽極與工(gong)(gong)件之間的(de)相對運動速率為(wei)(wei)15~16m/min,錫層厚(hou)度為(wei)(wei) 6~7μm]→水(shui)→中和（用電(dian)(dian)(dian)凈(jing)(jing)液(ye)(ye)無電(dian)(dian)(dian)擦技）→熱(re)水(shui)授泡（溫(wen)度 50℃熱(re)水(shui)，時間5min)→干燥→氨化(hua)(hua)（鍍錫后(hou)3天內）。

3. 刷(shua)鍍錫防滲氮出(chu)現問題，可(ke)能(neng)原因及(ji)解決(jue)辦法見表 4- 47 。