我厂生产的ZQSn—3—7—5—1海水泵体,采用砂型铸造,往往由于疏松、针孔等缺陷,在机加工后水压试验时发生局部渗漏现象。为了挽救因此而造成的废品,我们试验应用了镀—渗锡堵漏工艺,使其承压能力达8 kg/cm~2(水温80℃)而不渗漏。镀—渗工艺如下: 1.镀锡—镀液配比见表1。海水泵作阴 I produced ZQSn-3-7-5-1 seawater pump body, the use of sand casting, often due to loose, pinhole and other defects in the hydraulic pressure test after the occurrence of local leakage phenomenon. In order to save the resulting waste, we tested the use of plating - tin plugging process, its pressure capacity up to 8 kg / cm ~ 2 (water temperature 80 ℃) without leakage. Plated - seepage process is as follows: 1. Tin - plating ratio shown in Table 1. Sea water pump for overcast