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A pressure phosphating method to enhance the oxidation resistance of the surface of iron and steel materials

A technology of anti-oxidation ability and steel material, applied in the direction of metal material coating process, etc., can solve the problems of increasing production cost, polluting the environment, and metal material anti-corrosion bottleneck, etc., to achieve zero discharge of waste water and improve the effect of corrosion resistance.

Active Publication Date: 2015-10-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The industrial application of phosphating technology has a history of nearly a hundred years, but with the continuous advancement of science and technology, people have higher and higher requirements for metal material anticorrosion, and the traditional phosphating process is becoming more and more difficult to meet the anticorrosion requirements of metal materials
In the traditional phosphating process, the weight of the phosphating film is relatively low, and the density of the resulting phosphating film is not high, which has its own bottleneck for the corrosion protection of metal materials.
At the same time, the waste liquid after the reaction contains phosphorus, and the waste water must be treated before it can be discharged, which increases the production cost and pollutes the environment.

Method used

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  • A pressure phosphating method to enhance the oxidation resistance of the surface of iron and steel materials
  • A pressure phosphating method to enhance the oxidation resistance of the surface of iron and steel materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. First use alkali cleaning and pickling to remove the surface stains and oxides of the 40Cr steel material, and then dry the 40Cr steel material with the cleaned surface.

[0029] b. Put the dried 40Cr steel material into an autoclave for reaction. The components of the phosphating solution include: 10g / L phosphoric acid, 5g / L zinc oxide, 10g / L Mazoff salt; the phosphating reaction conditions are: pH value 2.0 (adjusted with phosphoric acid or ammonia water), temperature 150± 5°C, pressure (pressurized by argon) 1.5±0.1MPa, time 10min.

[0030] c. Clean and dry the processed 40Cr steel material to obtain the finished product.

Embodiment 2

[0032] a. First use alkali washing and pickling to remove the surface stains and oxides of the Cr12 iron and steel material, and then dry the Cr12 iron and steel material with the cleaned surface.

[0033] b. Put the dried Cr12 iron and steel material into an autoclave for reaction. The components of the phosphating solution include: 15g / L phosphoric acid, 8g / L zinc oxide, 15g / L Mazoff salt; the phosphating reaction conditions are: pH value 3.0 (adjusted with phosphoric acid or ammonia water), temperature 160± 5°C, pressure (pressurized by argon) 1.6±0.1MPa, time 12min.

[0034] c. Clean and dry the processed Cr12 steel material to obtain the finished product.

Embodiment 3

[0036] a. First use alkali washing and pickling to remove the surface stains and oxides of the 4Cr13 steel material, and then dry the 4Cr13 steel material with the cleaned surface.

[0037] b. Put the dried 4Cr13 steel material into an autoclave for reaction. The components of the phosphating solution include: 20g / L phosphoric acid, 10g / L zinc oxide, 20g / L Mazoff salt; the phosphating reaction conditions are: pH value 4.0 (adjusted with phosphoric acid or ammonia water), temperature 180± 5°C, pressure (pressurized by argon) 1.8±0.1MPa, time 15min.

[0038] c. Clean and dry the processed 4Cr13 steel material to obtain the finished product.

[0039] Comparison of phosphating film and oxidation resistance of steel after pressure phosphating and traditional phosphating:

[0040]

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Abstract

The invention discloses a pressure phosphating method for enhancing surface oxidation resistance of steel and iron materials. The method comprises the following steps: firstly, removing blots and oxides on the surfaces of the steel and iron materials, drying and then putting the dried steel and iron materials into a pressure kettle to react with a phosphating solution; cleaning and drying the surfaces of the steel and iron materials after reaction, so as to obtain the product. By adopting the method disclosed by the invention, 30-50 g / m<2> compact phosphating films can be generated on the surfaces of the steel and iron materials; the corrosion resistance of the steel and iron materials can be improved; meanwhile, the steel and iron materials also have antifriction lubricating effects; the reacted liquid waste can be recycled after the concentration of phosphate is regulated. Compared with the traditional phosphating process, the method disclosed by the invention is economic, simple to operate, and good in phosphating effect; zero discharge is charged by the entire process.

Description

technical field [0001] The invention relates to a method for chemically treating the surface of iron and steel materials to improve the anti-oxidation ability of the iron and steel materials and improve the anti-friction and lubrication of the surface. Background technique [0002] Phosphating treatment is a commonly used pretreatment technology for iron and steel materials and non-ferrous metals. It mainly involves a series of chemical and electrochemical reactions between metal materials and phosphating solution to form a phosphate chemical conversion film. This layer of phosphating film can give The base metal provides protection and is often used as a primer before metal painting and to provide anti-friction lubrication during metal cold working. [0003] The industrial application of phosphating technology has a history of nearly a hundred years. However, with the continuous advancement of science and technology, people have higher and higher requirements for metal mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07C23C22/73
Inventor 薛烽巨佳周健白晶孙扬善
Owner SOUTHEAST UNIV