准确剪取50×50毫米试片,放入400毫升烧杯中。试片下面垫一环状铂丝,加盐酸(3+1)10毫升,用玻棒压紧试片,使之与铂丝接触良好,并时时晃动烧杯。待镀层溶完,夹出试片和铂丝,用少量水冲洗干净。将此溶液转入锥形瓶中,加EDTA溶液(0.05M)10毫升,氨水(1+1)10毫升,用水稀释至约80毫升,加六次甲基四胺溶液(30%)15毫升(溶液pH≈5.6),加热至微 Accurately cut 50 × 50 mm specimen, into a 400 ml beaker. Under the test piece pad a ring of platinum wire, add hydrochloric acid (3 +1) 10 ml, with a glass rod compact test piece, so that good contact with the platinum wire, and shaking the beaker from time to time. To be dissolved coating, clip out the specimen and platinum wire, rinse with a small amount of water. The solution was transferred to a conical flask, add 10 ml of EDTA solution (0.05 M), 10 ml of aqueous ammonia (1 + 1), dilute to about 80 ml with water and add 15 ml of hexamethylenetetramine solution (30%) (PH = 5.6 solution), heated to micro