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.
CN103484847AActive Publication Date: 2014-01-01STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2014-01-01

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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.
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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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