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

A surface phosphating and phosphating technology, applied in the plating of superimposed layers, metal material coating process, coating and other directions, can solve the problems of no one reported on sealing and few reports on carbon steel protection, and it is easy to achieve. The effect of purchasing, fast film formation, and short nickel plating time

Inactive Publication Date: 2010-04-14
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 embodiment, the formula of 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, dissolve the above compound in deionized water to prepare 100 ml of phosphating solution, and adjust the pH value of the phosphating solution to 2.7-2.9 with NaOH solution.

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

[0047] Grind the surface of the carbon steel sheet with metallographic gauze paper No. 1~6, then put the test piece in acetone for ultrasonic cleaning for 10 seconds, and rinse the surface with deionized water; then immerse the carbon steel sheet to 5g / L surface adjustment s...

Embodiment 2

[0050] In this embodiment, the nickel plating solution formula used is: NiSO 4 ·6H 2 O 250g / L, NiCl 2 ·6H 2 O 30g / L, H 3 BO 3 30g / L, saccharin 0.6g / L, 1,4-butynediol 0.3g / L, sodium lauryl sulfate 0.1g / L, dissolve the above compound in deionized water to 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, the pretreatment process of the carbon steel sheet, the phosphating treatment process, and the nickel plating sealing process are exactly the same as those in the first embodiment.

[0052] The phosphating film is gray-black, the film is uniform and dense, and the film weight is 3.78g / m 2 . The copper sulfate spot corrosion test result was 145 seconds; the adhesion of the phosphating film reached the first level. Soaked in 3.5% NaCl, after electrochemical test, the corrosion current density is 10 -6 A / cm 2 Down to 10 -7 A / cm 2 .

Embodiment 3

[0054] In this embodiment, the nickel plating solution formula used is: NiSO 4 ·6H 2 O 255g / L, NiCl 2 ·6H 2 O 36g / L, H 3 BO 3 38g / L, saccharin 0.55g / L, 1,4-butynediol 0.27g / L, sodium lauryl sulfate 0.06g / L, dissolve the above compound in deionized water to 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, the pretreatment process of the carbon steel sheet, the phosphating treatment process, and the nickel plating sealing process are exactly the same as those in the first embodiment.

[0056] The phosphating film is gray and black, the film 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 level. Soaked in 3.5% NaCl, after electrochemical test, the corrosion current density is 10 -6 A / cm 2 Down to 10 -7 A / cm 2 .

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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 ZnO, 10-40 g/L PO4<3->, 2.0-17 g/L 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 Ce<4+> 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, a phosphating and nickel plating sealing method, and belongs 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. Phosphating steel products before painting is an effective measure to increase the contact area between the coating and the product and improve the bonding force between the coating and the steel matrix. That is to say, the quality of the phosphating will determine the effect of the painting, and Ultimately determine 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 a process in wh...

Claims

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Application Information

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Patent Type & Authority Applications(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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