| 摘要 |
1,129,984. Electroless deposition of Ni-P alloys. SECRETARY OF THE ARMY U. S. A. Nov. 1,1965 [Oct. 30, 1964], No.46089/65. Headings C7A and C7F. A coating consisting of an alloy of Ni-P e.g. 94% Ni and 6% P, with at least one of W, Sn, Zn, Mo, Re, Be, Rh, Pd, Pt and Au is electrolessly deposited on a metal structure, e. g. a steel panel to provide sacrificial protection against corrosion, by immersing the structure in an alkaline citrate nickel-hypophosphite bath solution containing a salt of the above alloying metals. For an unammoniated bath, the solution contains 3-21 g/l NiSO 4 6H 2 O, 10-40 g/l sodium citrate 2H 2 O, 5-20 g/l Na H 2 PO 2 . H 2 O, 0À2 ml/l mercaptobenzothiazole (10 g/l in 2N NaOH) as stabilizer (except for depositing Ni-P-W alloy), and one or more of the salts: 8-80 g/l Na 2 WO 4 . 2H 2 O [giving 13% W in the deposit], 1-2 g/l Na 2 SnO 3 . 3H 2 O [<1%Sn], 1-4 g/l ZnSO 4 . 7H 2 O[7%Zn], 0À2-10g/l KReO 4 [17%Re], 0À2-5g/l BeF 2 [<1%Be], and 0À05-0À5g/l RhCl 2 . 3H 2 O [12% Rh]. For an ammoniated bath, the solution contains 50-100g/l sodium citrate. 2H 2 O, 5-20g/l NaH 2 PO 2 . H 2 O, 5-60g/l NH 4 Cl, and 0.04-0.2 mols/1 NisO 4 . 6H 2 O + X where X is salt selected from 20-80 mol% Na 2 WO 4 . 2H 2 O [giving 12%W in the deposit], 5-20 Mol % Na 2 SnO 3 . 3H 2 O [2%Sn], 10-40 mol% ZnSO 4 . 7H 2 O [8%Zn], 0.1-0.4 mol % Na 2 MoO 4 . 2H 2 O [6%Mo], 1-20 mol % K ReO 4 [45% Re], 0À1-1À0 mol % each of PdCl, [5% Pd], HPtCl 4 . 3H 2 O [< 1% Pt] and HAu Cl 4 . 3H 2 O [<1%Au]. |
