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Method for coating normal-temperature black phosphating film on steel surface

A technology of steel surface and phosphating film, applied in phosphating and other directions, can solve problems such as hydrolysis, and achieve the effects of less slag, faster film formation, and less use of drugs

Inactive Publication Date: 2015-01-21
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Sb3+ ions are easily hydrolyzed, and phosphating needs to be carried out in a relatively concentrated hydrochloric acid medium, and a little carelessness during the preparation of the phosphating solution can easily cause the hydrolysis of Sb3+ ions

Method used

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  • Method for coating normal-temperature black phosphating film on steel surface
  • Method for coating normal-temperature black phosphating film on steel surface
  • Method for coating normal-temperature black phosphating film on steel surface

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) React antimony trichloride (SbCl3) with tartaric acid to form a trivalent antimony tartrate complex;

[0027] Preparation method: Dissolve 2.3 g of antimony trichloride and 6 g of tartaric acid in water, add sodium hydroxide solution dropwise while stirring until the reaction solution is clear, and obtain a trivalent antimony tartrate complex.

[0028] (2) dissolving the complex of trivalent antimony tartrate in the phosphating solution to obtain the phosphating solution containing antimony tartrate;

[0029] Preparation method: 6g / L of zinc oxide, 35g / L of phosphoric acid, 30g / L of Maziv's salt, 1g / L of nickel nitrate are dissolved and clarified, and then added to the trivalent antimony tartrate complex solution to obtain blackened phosphating liquid.

[0030] (3) Phosphating, that is, placing the cleaned steel sample in a phosphating solution containing trivalent antimony tartrate, and performing electrolytic phosphating at room temperature for 10 minutes;

[00...

Embodiment 2

[0039] (1) React antimony trichloride (SbCl3) with citric acid to generate trivalent antimony citrate complex;

[0040] Preparation method: dissolve 3.8 g of antimony trichloride and 12 g of citric acid in water, add sodium hydroxide solution dropwise while stirring until the reaction solution is clear, and obtain a trivalent antimony citrate complex.

[0041] (2) dissolving the trivalent antimony citrate complex in the phosphating solution to obtain a phosphating solution containing antimony citrate;

[0042] Preparation method: 8g / L of zinc oxide, 60g / L of phosphoric acid, 20g / L of Maziv's salt, 3g / L of nickel nitrate are dissolved and clarified, and then added to the trivalent antimony complex solution of citric acid to obtain black phosphorus liquid.

[0043] (3) Phosphating, that is, placing the cleaned steel sample in a phosphating solution containing trivalent antimony tartrate, and performing electrolytic phosphating at room temperature for 20 minutes;

[0044] The p...

Embodiment 3

[0048] (1) Reaction of antimony trioxide (Sb2O3) with disodium edetate to form trivalent antimony complex of edetate;

[0049] Preparation method: Dissolve 0.95 g of antimony trioxide and 4 g of disodium edetate in water, add sodium hydroxide solution dropwise while stirring until the reaction liquid is clear, and obtain trivalent antimony edetate complex.

[0050] (2) dissolving the trivalent antimony EDTA complex in the phosphating solution to obtain a phosphating solution containing antimony EDTA;

[0051] Preparation method: 5g / L of zinc oxide, 30g / L of phosphoric acid, 40g / L of Mazoff salt, and 2g / L of nickel nitrate are dissolved and clarified, and then added to the trivalent antimony complex solution of ethylenediaminetetraacetic acid to obtain Blackened phosphating solution.

[0052] (3) Phosphating, that is, place the cleaned steel sample in a phosphating solution containing trivalent antimony ethylenediaminetetraacetic acid, and perform electrolytic phosphating at r...

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Abstract

The invention relates to a method for coating a film on a steel surface, particularly a method for coating a normal-temperature black phosphating film on a steel surface. The black phosphating solution is composed of organic acid antimony, 5-10 g / L zinc oxide, 30-60 g / L phosphoric acid, 20-40 g / L manganese dihydrogen phosphate, 1-3 g / L nickel nitrate and the balance of water. A cathode electrolysis phosphating process is adopted to perform normal-temperature phosphating on the steel surface, wherein the current density is 0.5-3 A / dm<2>, and the time is 5-20 minutes. The method has the advantages of energy saving, environment friendliness, stable phosphating solution, simple phosphating technique, high film-forming speed, black color of the film layer, and favorable corrosion resistance, and is convenient to operate and suitable for various steel surface treatment.

Description

technical field [0001] The invention relates to a method for coating the steel surface, in particular to a method for coating the steel surface with a normal-temperature black phosphating film. Background technique [0002] Steel surface blackening technology is widely used in surface protection and decoration in aviation, electronics, instrumentation, military industry and other fields. The blackening of steel mainly includes high-temperature alkaline chemical oxidation blackening, normal temperature selenide system blackening and black phosphating and other methods. The high-temperature alkaline blackening process consumes a lot of energy, has a long production cycle, poor working conditions and serious environmental pollution. Although the room-temperature selenide system blackening solves the problems of high-temperature alkaline blackening that takes a long time and requires heating, but the selenide in the blackening solution is expensive and highly toxic. Black ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/36
CPCC25D11/36
Inventor 李锋王桂燕孙弘李枚枚
Owner SHENYANG UNIV
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