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Neutral phosphorus-free rust remover used for sheet metal rust removal

A metal sheet and rust remover technology, applied in the field of neutral phosphorus-free rust remover, can solve the problems of hydrogen embrittlement of workpieces, equipment and human body hazards, acid mist escape, etc., and achieve the effect of avoiding performance damage

Active Publication Date: 2014-02-26
天津青烽永明科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used rust remover is hydrochloric acid or sulfuric acid. During the rust removal process, a large amount of acid mist will escape, which will cause great harm to equipment and human body, and will also cause hydrogen embrittlement to the workpiece itself.

Method used

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  • Neutral phosphorus-free rust remover used for sheet metal rust removal
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  • Neutral phosphorus-free rust remover used for sheet metal rust removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Take by weight 20% of potassium oxalate, 10% of formic acid, 5% of sodium fatty acid methyl ester sulfonate, 8% of sodium sulfate and 3% of sodium benzoate, add water temperature between 50-60 degrees to remove Stir in ionized water for 20-60 minutes. After the aqueous solution is uniform, add 7% sodium hydroxide at the end to adjust the pH value of the aqueous solution to 5-7 to make a neutral phosphorus-free rust remover. After being treated with the above-mentioned neutral phosphorus-free rust remover, the test results are as follows: figure 1 shown.

Embodiment 2

[0023] Embodiment 2: Weigh 10% potassium oxalate, 5% formic acid, 1% sodium fatty acid methyl ester sulfonate, 5% sodium sulfate and 1% sodium benzoate by weight percentage, add water temperature between 50-60 degrees to remove Stir in ionized water for 20-60 minutes. After the aqueous solution is uniform, finally add 3% sodium hydroxide to adjust the pH value of the aqueous solution to 5-7 to make a neutral phosphorus-free rust remover. After being treated with the above-mentioned neutral phosphorus-free rust remover, the test results are as follows: figure 2 shown.

Embodiment 3

[0024] Embodiment 3: Weigh 35% potassium oxalate, 15% formic acid, 10% sodium fatty acid methyl ester sulfonate, 10% sodium sulfate and 1% sodium benzoate by weight percentage, add water temperature between 50-60 degrees to remove Stir in ionized water for 20-60 minutes. After the aqueous solution is uniform, finally add 12% sodium hydroxide to adjust the pH value of the aqueous solution to 5-7 to make a neutral phosphorus-free rust remover. After being treated with the above-mentioned neutral phosphorus-free rust remover, the test results are as follows: image 3 shown.

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Abstract

The invention discloses a neutral phosphorus-free rust remover used for sheet metal rust removal. The neutral phosphorus-free rust remover is composed of, by weight: 10-35% of a complexing agent, 5-15% of an organic acid, 1-10% of a surfactant, 5-10% of an inorganic salt, 1-5% of a metal corrosion inhibitor, 3-12% of a pH regulator, and the balance deionized water. Compared with the prior art, the neutral phosphorus-free rust remover provided by the invention has the advantages of low cost, energy consumption saving in room temperature use and no environmental pollution, and can improve the workpiece's anti-rust problem caused by the workshop environment or too long process turnover time.

Description

technical field [0001] The invention relates to a neutral phosphorus-free derusting agent for derusting metal plates. Background technique [0002] Metal surfaces are susceptible to rust from atmospheric oxygen, water, and other factors. In particular, steel workpieces or galvanized sheets may be contaminated with oil or anti-rust during the production process and turnover. Before spraying, the oil or floating rust must be removed to avoid affecting the coating performance. The commonly used rust remover is hydrochloric acid or sulfuric acid. During the rust removal process, a large amount of acid mist will escape, which will cause great harm to equipment and human body, and hydrogen embrittlement will also occur on the workpiece itself. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a new neutral phosphorus-free derusting agent for derusting metal plates, used for derusting metal surfaces, and a...

Claims

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Application Information

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IPC IPC(8): C23G1/06
Inventor 刘常兴许志诚
Owner 天津青烽永明科技发展有限公司
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