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Method for preparing composite organic protective film on surface of steel

A technology for steel surface and protective film, which is applied to the device for coating liquid on the surface, pretreatment surface, coating, etc. It can solve the problems of low friction reduction, lack, affecting the performance of organic protective film, etc., and achieve the friction coefficient. The effect of reducing, strong binding, and improving compactness

Inactive Publication Date: 2009-09-30
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the heat resistance and corrosion resistance are improved by the two-time film formation using waste heat, the friction reduction property is not high
[0005] Therefore, before the present invention, since the waste heat of the iron and steel workpiece itself cannot be used to obtain a dense, heat-resistant, friction-reducing, and water-free protective film, the performance of the organic protective film is greatly affected, resulting in its lack of heat resistance, corrosion resistance, and requirements. Basis for practical use in the case of low coefficients of friction

Method used

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  • Method for preparing composite organic protective film on surface of steel
  • Method for preparing composite organic protective film on surface of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] control figure 2 , add 40 grams of 1500 mesh organic bentonite in 100 milliliters of water, stir well and place it for 1 hour for later use; add 2 grams of water-based carbon black slurry in 100 grams of water-based epoxy resin emulsion with a solid content of 50% (according to color requirements, you can Add the color paste of other colors), 1 gram of trisodium phosphate, 20 grams of prepared organic bentonite liquid, 50 grams of 50% water-based polytetrafluoroethylene emulsion, stir to make epoxy resin film-forming liquid for subsequent use. Adjust the concentration of the film-forming liquid according to the size of the workpiece and the heating temperature. Film-forming liquid: tap water = 1:5. Example 1 workpiece is a Φ20 nut. Heating temperature 400°C±10°C, keep warm for 20 minutes, take out the workpiece and immerse it in the film-forming solution whose concentration has been adjusted for 10 seconds, then take it out, and put the film-formed workpiece back int...

Embodiment 2

[0026] The steel workpiece is a Φ40 nut, the heating temperature is 400°C±10°C, and the temperature is kept for 20 minutes. The film-forming liquid:tap water=1:7.

[0027] control figure 2 , first, heat the workpiece nut at a heating temperature of 400°C±10°C, keep it warm for 20 minutes, then take out the workpiece and immerse it in the film-forming liquid pool whose concentration has been adjusted for 10 seconds. The workpiece after the first film formation is put back into the heating furnace for heating at a heating temperature of 150°C±10°C for 30 minutes, then the workpiece is taken out and air-cooled to obtain an organic protective film with a film thickness of about 20um.

[0028] The organic protective film of this embodiment is soaked in 5% hydrochloric acid solution for 3 days without peeling, and the corrosion point is less than 1 / square centimeter. Soaked in 5% sodium hydroxide aqueous solution for 7 days, there is no abnormality, the friction coefficient is red...

Embodiment 3

[0030] The steel workpiece is a Φ40 nut, the heating temperature is 500°C±10°C, and the temperature is kept for 20 minutes. The film-forming liquid: tap water = 1:8;

[0031] control figure 2 , first, heat the workpiece nut at a heating temperature of 400°C±10°C, keep it warm for 20 minutes, then take out the workpiece and immerse it in the film-forming liquid pool whose concentration has been adjusted for 10 seconds. The workpiece after the first film formation is put back into the heating furnace 1 for heating, the heating temperature is 300°C±10°C, and the temperature is kept for 15 minutes. The workpiece is taken out and cooled in air or immersed in water, and then taken out to obtain an organic protective layer with a film thickness of about 20um. membrane.

[0032] The organic protective film of this embodiment is soaked in 5% sodium chloride solution for 20 days without peeling, and the corrosion point is less than 1 / square centimeter. Soaked in 5% sodium hydroxide a...

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Abstract

The invention discloses a method for preparing a composite organic protective film on the surface of steel, which belongs to the technical field of steel surface protection. The method comprises the following steps: mixing a water borne epoxy resin emulsion, water or water borne color paste, and stirring the mixture evenly to prepare a water borne epoxy resin film-forming liquid for standby; adding a dispersant and an antifrictional, corrosion resistant and heat-resisting material into the film-forming liquid; then forming a film on a workpiece by excess heat: heating up a steel workpiece, keeping the temperature so that the workpiece is heated thoroughly, taking out the workpiece and soaking the workpiece into a water borne epoxy resin film-forming liquid tank for 5 to 30 seconds, taking the workpiece out of the tank, and heating and drying the workpiece, or reheating the steel workpiece coated by a layer of protective film, keeping the temperature, taking out the steel workpiece, and cooling the steel workpiece in air or water to prepare a layer of composite organic protective film. The composite organic protective film prepared by the method has high heat resistance and corrosion resistance, and the frictional coefficient thereof is greatly reduced. The protective film has the characteristic of not being wetted so that various performances of the protective film are improved. The protective film has strong bonding force with steel materials without flaking off and can be applied widely.

Description

technical field [0001] The invention belongs to the technical field of steel surface protection, in particular to a method for preparing a composite organic protective film on the steel surface capable of heat resistance, corrosion resistance and low friction coefficient. Background technique [0002] In order to prevent corrosion and rust of steel parts and increase the beauty of parts, the traditional methods have been using alkaline blackening process, painting, spraying and other processes. [0003] There are many methods and types of protection and decoration on the surface of steel materials, and they are widely used. There are electroplating using electrochemical reactions; there are blackening and phosphating using oxidation reactions. There are also hot-dip metallization (such as hot-dip zinc, hot-dip aluminum, etc.) and dip coating and spraying of various paints using physical metallurgical methods. The iron and steel materials used in some special working condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/24B05D1/18B05D3/02C09D163/00
Inventor 王树成赵国刚王淑花
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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