Phosphorization processing liquid for surface of carbon steel and nickel plating enclosure method

A surface phosphating and phosphating treatment technology, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of sealing and no one reports, carbon steel protection is rarely reported, and achieves easy The effect of purchasing, fast film forming speed and short nickel plating time

Inactive Publication Date: 2011-03-30
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as "Electroplating Process Handbook" (the second edition of Machinery Industry Press in August, 1997); and Chinese patents ZL92102593.9, ZL200510013473.6, ZL200610092988.4, which disclose mainly the phosphating of carbon steel surface phosphating treatment There are few reports about the combination of surface phosphating treatment and nickel plating on the protection of carbon steel, especially the sealing of nickel plating on the phosphating film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the formulation of the phosphating solution is: ZnO 5.5g / L, PO 4 3- 23g / L, NiSO 4 ·6H 2 O 8.6g / L, guanidine nitrate 0.6g / L, sodium nitrate 20g / L, Ce 4+ 0.6g / L, the above compound was dissolved in deionized water to prepare 100 ml of phosphating solution, and the pH value of the phosphating solution was adjusted to 2.7-2.9 with NaOH solution.

[0046] The formula of the nickel plating solution used is: NiSO 4 ·6H 2 O 240g / L, NiCl 2 ·6H 2 O 23g / L, H 3 BO 3 25g / L, 0.65g / L saccharin, 0.32g / L 1,4-butynediol, 0.16g / L sodium lauryl sulfate, dissolve the above compounds in deionized water, and prepare 250ml nickel plating solution , The pH value of the nickel plating solution is adjusted to 4.0-4.5 with NaOH solution.

[0047] Polish the surface of the carbon steel sheet with No. 1-6 metallographic gauze paper, then put the test piece into acetone and ultrasonically clean it for 10 seconds, and rinse the surface with deionized water; then immerse the ...

Embodiment 2

[0050] In the present embodiment, the formula of the nickel plating solution that adopts is: NiSO 4 ·6H 2 O 250g / L, NiCl 2 ·6H 2 O 30g / L, H 3 BO 330g / L, 0.6g / L saccharin, 0.3g / L 1,4-butynediol, 0.1g / L sodium lauryl sulfate, dissolve the above compounds in deionized water, and prepare 250ml nickel plating solution , The pH value of the nickel plating solution is adjusted to 4.0-4.5 with NaOH solution.

[0051] The formula of the phosphating solution adopted, the pretreatment process of the carbon steel sheet, the phosphating treatment process, and the nickel plating sealing process are exactly the same as those of the above-mentioned embodiment 1.

[0052] The phosphating film is gray black, the film layer is uniform and dense, and the film weight is 3.78g / m 2 . The copper sulfate spot corrosion test result is 145 seconds; the adhesion of the phosphating film reaches the first grade. Soaked in NaCl with a mass fraction of 3.5%, the corrosion current density was changed ...

Embodiment 3

[0054] In the present embodiment, the formula of the nickel plating solution that adopts is: NiSO 4 ·6H 2 O 255g / L, NiCl 2 ·6H 2 O 36g / L, H 3 BO 3 38g / L, 0.55g / L saccharin, 0.27g / L 1,4-butynediol, 0.06g / L sodium lauryl sulfate, dissolve the above compounds in deionized water, and prepare 250ml nickel plating solution , The pH value of the nickel plating solution is adjusted to 4.0-4.5 with NaOH solution.

[0055] The formula of the phosphating solution adopted, the pretreatment process of the carbon steel sheet, the phosphating treatment process, and the nickel plating sealing process are exactly the same as those of the above-mentioned embodiment 1.

[0056] The phosphating film is gray black, the film layer is uniform and dense, and the film weight is 4.02g / m 2 . The copper sulfate spot corrosion test result was 134 seconds; the adhesion of the phosphating film reached the first grade. Soaked in NaCl with a mass fraction of 3.5%, the corrosion current density was ch...

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Abstract

The invention relates to a phosphorization processing liquid for the surface of carbon steel and a nickel plating enclosure method, belonging to the technical field of chemical conversion film processing for the surface of metal. The phosphorization processing liquid comprises the following components: 2.0-7.0 g / L of ZnO, 10-40 g / L of PO43-, 2.0-17 g / L of NiSO4.6H2O, 0.4-0.8 g / L of guanidine nitrate, 10-30 g / L of sodium nitrate and 0.4-0.8 g / L of Ce4+ rare-earth ions, and the pH value of the phosphorization processing liquid is 2.7-2.9. The nickel plating enclosure method comprises the following steps: polishing a carbon steel sheet, removing oil by using acetone, soaking the carbon steel sheet in 5 g / L of surface correction liquor for surface correction, and then putting the carton steel sheet into the phosphorization processing liquid; controlling the temperature of the phosphorization processing liquid to be about 45 DEG C and carrying out phosphorization reaction for 15 mins; cleaning and blowing for drying after the phosphorization reaction; placing the phosphorized carbon steel sheet into nickel plating liquid, and plating nickel for 1 minute at room temperature and constant current; and cleaning and blowing for drying after nickel plating enclosure is finished. A phosphorization film generated after phosphorization treatment and nickel plating enclosure treatment has better corrosion resistance, and a generated film is uniform and compact.

Description

technical field [0001] The invention relates to a carbon steel surface phosphating treatment liquid and a phosphating and nickel-plating sealing method, belonging to the technical field of metal surface chemical conversion film treatment. Background technique [0002] The surface coating treatment of steel products is not only the main effective means of steel protection but also the decoration of steel products. The phosphating of steel products before painting is an effective measure to increase the contact area between the coating and the product, and to improve the bonding force between the coating and the steel substrate. That is to say, the quality of phosphating will determine the effect of painting, and Ultimately determines the effect of steel protection. Studies have shown that the corrosion resistance of steel surface phosphating and then painting is about 12 times higher than that of direct painting without phosphating. [0003] Phosphating treatment refers to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/13C23C28/00C25D3/16
Inventor 钟庆东王毅盛敏奇钮晓博王超
Owner SHANGHAI UNIV
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