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Phosphating solution and phosphating method

A phosphating solution and fluoride technology, which is applied in the coating process of metal materials, etc., can solve the problems that are not conducive to the phosphating of iron and zinc in the same tank, high energy consumption of the process, and prolonged phosphating time.

Active Publication Date: 2014-01-01
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can simultaneously form a homogeneous phosphating film on the surface of zinc, iron metal and its components, but the organic complex and zinc ions used in the phosphating solution have a high stability constant, which makes iron and zinc in this The potential difference in the phosphating tank is large, which is not conducive to the phosphating of iron and zinc in the same tank, and the phosphating solution contains carcinogenic NO 2 - , ClO 3 - into Cl - It also prolongs the phosphating time, which in turn leads to loose, porous, dusty, and reduced corrosion resistance of the phosphating film. In addition, the phosphating treatment temperature of 60°C also makes the process consume more energy.

Method used

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  • Phosphating solution and phosphating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The galvanized steel sheet was degreased in a degreasing solution at 50°C for 5 min, washed with hot water and flowing water, and then treated in an acid etching solution for 10 min at room temperature. After treatment for 40s, without water washing, directly into the phosphating solution, heating to a temperature of 42°C in a water bath, and phosphating for 5 minutes to obtain a phosphatized galvanized steel sheet. The composition of phosphating solution is: Zn(H 2 PO 4 ) 2 1g / L, Zn(NO 3 ) 2 ·6H 2 O10g / L, Ni(NO 3 ) 2 ·6H 2 O0.8g / L, sodium fluoride 0.2g / L, sodium citrate 1.5g / L, cerium nitrate 1.2g / L, the balance of water; FA is 1.8 points, TA is 10.5 points, TA / FA is 5.4 points .

[0051] The galvanized steel sheet after phosphating treatment obtained in Example 1 is analyzed, and the obtained phosphating film is gray, the film layer is uniform and dense, and the average film weight is 2.24g / m2 3 .

[0052] The phosphated galvanized steel sheet obtained in E...

Embodiment 2

[0055] Degrease the galvanized steel sheet in a degreasing solution at 50°C for 5 minutes. After washing with hot water and flowing water, treat the treated galvanized steel sheet in a surface conditioning solution for 40s at room temperature without washing, and directly enter the phosphating solution. The water bath was heated to a temperature of 42° C., and the phosphating treatment was carried out for 5 min to obtain a galvanized steel sheet after the phosphating treatment. The composition of phosphating solution is: Zn(H 2 PO 4 ) 2 3g / L, Zn(NO 3 ) 2 ·6H 2 O8g / L, Ni(NO 3 ) 2 ·6H 2 O0.8g / L, sodium fluoride 0.2g / L, sodium salicylate 1.5g / L, cerium nitrate 1.2g / L, the balance of water; FA is 1.7 points, TA is 10.5 points, TA / FA is 6.2 point.

[0056] The galvanized steel sheet after phosphating treatment obtained in Example 2 was analyzed, and the obtained phosphating film was gray, and the film layer was uniform and dense.

Embodiment 3

[0058]Degrease the hot-dip galvanized steel sheet in a degreasing solution at 50°C for 5 min, wash with hot water and flowing water, and then treat it in an acid etching solution for 10 min at room temperature, and then adjust the galvanized steel sheet after acid etching on the surface. The solution was treated at room temperature for 40s, without washing, directly into the phosphating solution, heated to a temperature of 38°C in a water bath, and phosphatized for 4 minutes to obtain a phosphated galvanized steel sheet. The composition of phosphating solution is: Zn(H 2 PO 4 ) 2 1g / L, Zn(NO 3 ) 2 ·6H 2 O9g / L, Ni(NO 3 ) 2 ·6H 2 O0.8g / L, sodium fluoride 0.2g / L, sodium salicylate 1.2g / L, cerium nitrate 1.2g / L, the balance of water; FA is 1.7 points, TA is 16 points, TA / FA is 9.4 point.

[0059] The galvanized steel sheet after phosphating treatment obtained in Example 3 was analyzed, and the obtained phosphating film was gray, and the film layer was uniform and dense. ...

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Abstract

The invention provides a phosphating solution and a phosphating method. The phosphating solution comprises 0.4-8g / L Zn(H2PO4)2, 5-18g / L Zn(NO3)2.6H2O, 0.7-1.0g / L Ni(NO3)2.6H2O, 0.2-0.5g / L fluoride, 1.0-2.2g / L additive and 0-1.5g / L rare-earth salt, wherein the additive is selected from one or more of citric acid, citrate, salicylic acid and salicylate. Compared with the prior art, the complexing constant of the additive with respect to Zn<2+> is greatly lower than that with respect to Fe<2+>, so that the potential difference between zinc and iron in the phosphating solution can be effectively shortened, thereby providing a guarantee for simultaneous phosphating of iron and zinc in one tank; and depolarization action produced by high adsorbability of rare earth ions generated by the rare-earth salt on a cathode surface promotes the formation of a phosphating film, and the corrosion resistance of the film is also improved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of galvanized steel parts, in particular to a phosphating solution and a phosphating method. Background technique [0002] Hot-dip galvanizing has good anti-corrosion properties of steel and is widely used in industries such as automobiles, construction, electric power, transportation and household appliances, while phosphating technology can further improve the corrosion resistance of hot-dip galvanized steel. [0003] At present, there are many researches on the phosphating technology of galvanized steel, and many mature and good phosphating processes have been developed. [0004] Lu Jintang's research team from South China University of Technology used 1.2g / L ZnO, 15.0g / L NaNO 3 , 11.0ml / L H 3 PO 4 (85%), 0~20g / L Na 2 MoO 4 ·2H 2 O as the basic formula, the effects of different methods such as colloidal phosphopeptide surface conditioning, sodium silicate and cerium nitrate seal...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 周海飞魏洪侠刘炳根闫研周琼周娟肖军
Owner STATE GRID CORP OF CHINA
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