| 摘要 |
FIELD: phosphating of carbon steel before anode and cathode electrodeposition in automobile industry, machine building and instrument making; phosphating of carbon steel and low alloyed steel without their preliminary mechanical cleansing. SUBSTANCE: aqueous solutions of zinc nitrate and nitric acid extract of apatite are added into aqueous solution of zinc monophosphate, ratio of zinc and P<SB>2</SB>O<SB>5</SB>= in zinc monophosphate being (1.0-1.25): (3.75-5.0), respectively. Ratio of Zn and NO<SB>3</SB> in aqueous solution of zinc nitrate is (1.0-1.79):(3.07-3.6), respectively. Ratio of P<SB>2</SB>O<SB>5</SB> and NO<CHF>-@3</CHF> in nitric acid extract of apatite concentrate is (1.0-1.15):(3.0-4.62), respectively. Temperature of working mixture is 40-50 C. Ratio of supplying aqueous solution of zinc nitrate and aqueous solution of nitric acid extract of apatite concentrate is 12.7-14.2 <EMI ID=0.23 HE=6 WI=21 TI=CHI> and 12.5-14.2 <EMI ID=0.24 HE=6 WI=21 TI=CHI>, respectively. EFFECT: improved efficiency of the method. 3 cls |
