Phosphating liquid of high corrosion resistance black phosphating production process

A production process, phosphating solution technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance, affecting the conductivity of parts, unsuitability, etc., and achieve the effect of high corrosion resistance, firm adhesion, and fine crystallization

Active Publication Date: 2010-10-20
西安北方光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The film is thin and has poor corrosion resistance, so it is not suitable for military products with high corrosion resistance requirements;
[0005] 2) The appearance of phosphating film has insufficient blackness, which is not suitable for the matting requirements of optical system parts
[0006] In order to solve the above problems, the common method is to apply a protective film on the surface after phosphating. This protective film is mostly organic coating, which affects the conductivity of the parts and increases the thickness of the parts. It is not suitable for parts with high precision matching requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. The preparation method of the phosphating solution: the phosphating solution is 30g / L zinc oxide ZnO, 128g / L phosphoric acid H 3 PO 4 , 125g / L zinc nitrate Zn(NO 3 ) 2 ·6H 2 O, 6g / L nitric acid HNO 3 , 4g / L citric acid, 0.7g / L tartaric acid, 8g / L nickel nitrate concentration ratio composition, according to the volume of the required phosphating solution, calculate the required zinc oxide, phosphoric acid, zinc nitrate, nitric acid, citric acid , tartaric acid, nickel nitrate; add one-third of distilled water to the tank, add phosphoric acid, nitric acid, citric acid, tartaric acid, nickel nitrate in turn and stir evenly, then add zinc oxide into a paste with water and add it to the tank; After complete dissolution, finally add the measured zinc nitrate, add distilled water to the specified volume, stir evenly, and adjust the acidity before use. When the total volume of the phosphating solution is 1000L, 30kg of zinc oxide, 128kg of phosphoric acid, 125kg of z...

Embodiment 2

[0019] 1. The preparation method of the phosphating solution: the phosphating solution is 25g / L zinc oxide ZnO, 120g / L phosphoric acid H 3 PO 4 , 100g / L zinc nitrate Zn(NO 3 ) 2 ·6H 2 O, 5g / L nitric acid HNO 3 , 3g / L citric acid, 0.5g / L tartaric acid, 5g / L nickel nitrate concentration ratio composition, according to the volume of the required phosphating solution, calculate the required zinc oxide, phosphoric acid, zinc nitrate, nitric acid, citric acid , tartaric acid, nickel nitrate; add one-third of distilled water to the tank, add phosphoric acid, nitric acid, citric acid, tartaric acid, nickel nitrate in turn and stir evenly, then add zinc oxide into a paste with water and add it to the tank; After complete dissolution, finally add the measured zinc nitrate, add distilled water to the specified volume, stir evenly, and adjust the acidity before use. When the total volume of the phosphating solution is 1000L, 25kg of zinc oxide, 120kg of phosphoric acid, 100kg of z...

Embodiment 3

[0024] 1. The preparation method of the phosphating solution: the phosphating solution is 35g / L zinc oxide ZnO, 135g / L phosphoric acid H 3 PO 4 , 150g / L zinc nitrate Zn(NO 3 ) 2 ·6H 2 O, 8g / L nitric acid HNO 3, 5g / L citric acid, 1g / L tartaric acid, 10g / L nickel nitrate concentration ratio composition, according to the volume of the required phosphating solution, calculate the required zinc oxide, phosphoric acid, zinc nitrate, nitric acid, citric acid, Tartaric acid, nickel nitrate; add one-third of distilled water to the tank, add phosphoric acid, nitric acid, citric acid, tartaric acid, nickel nitrate in sequence and stir evenly, then add zinc oxide into a paste with water and add it to the tank; wait until completely After dissolving, add the measured zinc nitrate at the end, add distilled water to the specified volume, stir evenly, and adjust the acidity before use. When the total volume of the phosphating solution is 1000L, 35kg of zinc oxide, 135kg of phosphoric ...

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PUM

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Abstract

The invention relates to phosphating liquid of a phosphating process, in particular to phosphating liquid of a high corrosion resistance black phosphating production process for steel piecec, which is characterized in that: the phosphating liquid comprises the following components: 25 to 35 g / L zinc oxide (ZnO), 120 to 135 g / L phosphoric acid H3PO4, 100 to 150 g / L zinc nitrate Zn(NO3)2.6H2O, 5 to 8 g / L nitric acid HNO3, 3 to 5 g / L citric acid, 0.5 to 1 g / L tartaric acid and 5 to 10 g / L nickel nitrate. The phosphating liquid ensures the fineness and smoothness of the phosphating film crystal of the steel piece, has firm attachment, good blackness and high abrasion resistance, and is particularly applicable to the steel components of the optical instrument.

Description

technical field [0001] The invention relates to a phosphating solution in a phosphating process, in particular to a phosphating solution in a high-corrosion-resistant black phosphating production process for steel parts, and belongs to the technical field of metal surface treatment. Background technique [0002] Phosphating refers to the process of chemical reaction and electrochemical reaction of metal parts in phosphate solution to form a layer of insoluble phosphate film (phosphating film) on the metal surface. Phosphating film can improve the corrosion resistance of metal, improve the adhesion between metal surface and coating, heat resistance and wear resistance, and improve the service life of metal parts coating. [0003] At present, the domestic phosphating process is mainly used in the treatment of steel painting production lines. The phosphating solution used in the phosphating process mainly has the following problems: [0004] 1) The film is thin and has poor co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/17
Inventor 王新军李麦翠
Owner 西安北方光电有限公司
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