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Method for chemical plating nickel phosphor alloy

A technology of electroless nickel-phosphorus and alloy plating, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems affecting the quality of the coating, low purity of nickel hypophosphite, and cannot be completely eliminated, and achieve performance improvement , Improve the plating speed and improve the life of the plating bath

Inactive Publication Date: 2004-11-17
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of the nickel hypophosphite obtained by the metathesis method is low, and the main substance Ni(H 2 PO 2 ) 2 ·6H 2 O percentage content is about 90-95%, because the product still contains 5-10% Na 2 SO 4 or NaCl and other impurities, so the disadvantage of using this raw material for electroless nickel plating is that it cannot completely eliminate Na + and SO 4 2- or Cl - The interference of other impurity ions on the electroless nickel plating affects the quality of the coating; the electroless nickel plating bath uses sodium hypophosphite to adjust the concentration ratio of nickel ions and hypophosphite ions, and in the plating process, nickel hypophosphite is also added and sodium hypophosphite to replenish the consumed Ni 2+ and H 2 PO 2 - , it is bound to make Na + and SO 4 2- or C l- Enrichment, which affects the life of the electroless nickel plating bath

Method used

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  • Method for chemical plating nickel phosphor alloy
  • Method for chemical plating nickel phosphor alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] First, a mixed solution of nickel hypophosphite and hypophosphorous acid is prepared by electrolysis. See the application 'method for preparing nickel hypophosphite by electrolysis' on the same date.

[0041] The electrolysis adopts six-chamber electrodialysis tank, the anode material is nickel plate, and the electrode area is 40cm 2 , The cathode is a stainless steel electrode. Anion and cation exchange membranes were purchased from Shanghai Chemical Plant, and the membrane area used in electrolysis was 70cm 2 . The solution volume of each chamber of the six-chamber electrodialysis cell is 450mL. The initial solution of the anode chamber before electrolysis is 10g / L sulfuric acid, the raw material chamber is 400g / L sodium hypophosphite, the cathode chamber and its adjacent buffer chamber are both 10g / L sodium hydroxide, and the product chamber and its adjacent buffer chamber are both 10g / L nickel hypophosphite.

[0042] Working voltage is 10~15V

[0043] Table 1 ...

example 2

[0055] Prepare 1 liter of plating solution with the above-mentioned nickel hypophosphite and hypophosphorous acid mixed solution, the plating solution composition comprises: nickel ion (Ni 2+ )6g / L, hypophosphite ion (H 2 PO 2 - ) 21g / L, sodium citrate 45g / L, sodium gluconate 20g / L, acetic acid 14ml / L, trace amount of lead (2-3ppm) (lead acetate). The concentrations of nickel ions and hypophosphite ions in the supplement solution are 36g / L and 126g / L respectively. Put the plating solution into a 2-liter glass plating tank, control the temperature of the plating bath at 87-90° C. with a constant temperature water bath, and adjust the pH of the plating bath to 5.5 with ammonia water. The treated four steel plates (50mm×30mm×1.20mm) were immersed in the plating bath, and the plated parts were taken out after 1 hour. After cleaning with distilled water, the thicknesses of the coatings were measured to be 16um, 17um, 18um and 18um respectively. It can be seen by the naked eye t...

example 3

[0063] Prepare new plating solution, do not contain sodium gluconate, other experimental conditions are identical with example 2. After half an hour of plating, it will be found that the oxidation-reduction reaction begins to occur in the plating bath, and a small area of ​​plating is formed at the bottom of the glass beaker, and the stability of the plating bath is reduced. After one hour, the plated parts were taken out, and after cleaning with distilled water, the thicknesses of the measured coatings were 9um, 7um, 8um and 6um respectively. Visually observe the surface of the coating to be dark, poor in uniformity and compactness, and have obvious pinholes.

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Abstract

The invention discloses a method for chemical plating nickel phosphor alloy, wherein the chemical plating bath comprises the main constituents of the mixed solution of nickel hypophosphite and hypophosphorous acid, sodium citrate, ethyl acetate, sodium glucoheptonate and trace amount of lead, wherein the nickel hypophosphite and hypophosphorous acid mixed solution is prepared through electrolytic method. The invention realizes substantially improved coating property.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to a new method for electroless nickel-phosphorus alloy plating, which uses a mixed solution of nickel hypophosphite and hypophosphorous acid as the main raw material to perform electroless plating on the surface of a catalytically active material A method for nickel-phosphorus alloys. Background technique [0002] Electroless plating is a surface strengthening method to improve the wear resistance and corrosion resistance of metal and other materials. It has the advantages of uniform coating, can be carried out on the surface of non-conductor and semiconductor materials, simple process, no power supply, and strong bonding force. Electroless nickel plating first deposits a layer of nickel on the surface of the catalytically active substrate immersed in the plating bath, so that the reaction continues and gradually forms a layer of metal nickel-phosphorus alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 张宝贵王福生宋兵魁万忠发万忠生
Owner NANKAI UNIV
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