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Washing-free normal-temperature phosphating solution after steel workpiece phosphating and preparation method thereof

A technology of water-free washing and phosphating solution, applied in the coating process of metal materials, etc., can solve the problems of high phosphating temperature, complex process, and many harmful waste water, achieve good adhesion, overcome complex process, and reduce residues

Active Publication Date: 2013-05-22
湖南中皖骏环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphating solution of the present invention can be used at normal temperature and is easy to operate, and overcomes the problems of traditional phosphating such as complex process, high phosphating temperature, and many harmful waste water

Method used

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  • Washing-free normal-temperature phosphating solution after steel workpiece phosphating and preparation method thereof
  • Washing-free normal-temperature phosphating solution after steel workpiece phosphating and preparation method thereof
  • Washing-free normal-temperature phosphating solution after steel workpiece phosphating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The phosphating solution is composed of the following raw materials and mass percentage:

[0023] 85% phosphoric acid 22%, zinc oxide 4%, sodium molybdate dihydrate 1.2%, lanthanum nitrate hexahydrate 2.5%, manganese nitrate tetrahydrate 2%, tartaric acid 0.2%, alkylphenol ether sulfosuccinate sodium salt 0.1% , sodium benzoate 0.1%, 70% phytic acid 0.2%, 30% hydrogen peroxide 0.2%, water balance.

[0024] Preparation method: first add zinc oxide to water twice the mass of zinc oxide and stir to make a paste, add 85% phosphoric acid, stir until uniform and transparent, and then add and stir successively; ①phytic acid and tartaric acid dissolved in water, ②respectively Lanthanum nitrate hexahydrate and manganese nitrate tetrahydrate that have been dissolved in water, ③ sodium molybdate dihydrate that has been dissolved in water; ④ the remaining raw materials except sodium benzoate, ⑤ sodium benzoate that has been dissolved in hot water; ⑥ ammonia water Adjust the pH val...

Embodiment 2

[0026] The phosphating solution is composed of the following raw materials and mass percentage:

[0027] 85% phosphoric acid 22%, zinc oxide 2.5%, sodium molybdate dihydrate 1.5%, lanthanum nitrate hexahydrate 2%, manganese nitrate tetrahydrate 3%, tartaric acid 0.3%, alkylphenol ether sulfosuccinate sodium salt 0.1% , 0.1% sodium benzoate, 0.3% 70% phytic acid, 0.2% 30% hydrogen peroxide, and the balance of water.

[0028] Preparation method: with embodiment 1.

Embodiment 3

[0030] The phosphating solution is composed of the following raw materials and mass percentage:

[0031] 85% Phosphoric Acid 23%, Zinc Oxide 3%, Sodium Molybdate Dihydrate 1.1%, Lanthanum Nitrate Hexahydrate 4.5%, Tartaric Acid 0.2%, Alkylphenol Ether Sulfosuccinate Sodium Salt 0.2%, Sodium Benzoate 0.1%, 70 % Phytic acid 0.1%, 30% hydrogen peroxide 0.2%, the balance of water.

[0032] Preparation method: with embodiment 1.

[0033] Using this formula for phosphating can shorten the phosphating time, and the phosphating film after phosphating completely meets or exceeds the performance parameters of the phosphating film after phosphating in the prior art. The performance comparison of the phosphating film is shown in Table 1.

[0034] Table 1 Performance comparison of phosphating film

[0035]

[0036] *The data in this row are the mean values ​​of the three examples.

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Abstract

The invention relates to a steel surface treating agent, particularly a washing-free normal-temperature phosphating solution after steel workpiece phosphating, which is prepared by mixing the following raw materials in percentage by mass: 12-25% of 85% phosphoric acid, 2-6% of zinc oxide, 1-2% of sodium molybdate dihydrate, 0.5-5.0% of lanthanum nitrate hexahydrate, 0-6% of manganous nitrate tetrahydrate, 0.1-0.8% of tartaric acid, 0.1-0.2% of alkylphenol ether sulfosuccinate sodium salt, 0.1-0.2% of sodium benzoate, 0.1-0.3% of 70% phytic acid, 0-0.5% of 30% oxydol and the balance of water. The preparation method comprises the following steps: adding zinc oxide into 2 times by mass of water, stirring into paste, adding 85% phosphoric acid, and stirring to a uniform transparent state; while stirring, sequentially adding phytic acid and tartaric acid which is dissolved in water, lanthanum nitrate hexahydrate and manganous nitrate tetrahydrate which are respectively dissolved in water, sodium molybdate dihydrate which is dissolved in water, the other raw materials except sodium benzoate, and sodium benzoate dissolved in hot water; regulating the pH value of the solution to 2.0; and adding water to the required amount.

Description

technical field [0001] The invention relates to a steel surface treatment agent, in particular to a steel surface phosphating treatment agent. Background technique [0002] The phosphating process has a history of more than 160 years since its birth. It is a process in which metal workpieces such as iron and steel are treated in a solution with metal, ammonium dihydrogen phosphate, and an accelerator as the main components, and a phosphating film is formed on the surface of the processed workpiece. process. Phosphating film as the bottom layer of the coating can significantly improve the adhesion, corrosion resistance and protective performance of the coating, and is widely used in automobiles, machinery, home appliances, military and other industries. Phosphating can be divided into iron series, zinc series, zinc calcium series, manganese series, zinc manganese series and other types according to film-forming cations; according to phosphating treatment temperature, it can ...

Claims

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Application Information

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IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 朱海斌
Owner 湖南中皖骏环保科技有限公司
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