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Multifunctional hydrochloric acid pickling additive

A pickling additive and multi-functional technology, which is applied in the field of surface treatment of steel products and materials, can solve the problems of plant nutrients, eutrophication of water, unfavorable surface treatment, etc. The effect of surface treatment

Inactive Publication Date: 2010-02-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the hydrochloric acid corrosion inhibitors currently used have high corrosion inhibition efficiency, they generally have the following disadvantages: 1) The function is single, and multiple varieties need to be used together to achieve the corrosion inhibition, fog suppression, and dissolution promotion required for cleaning. 2) The toxicity is high, and there are safety problems during use; 3) There are plant nutrients in the molecular structure, which may cause eutrophication of the water body after discharge; 4) It does not have the ability to prevent rust after cleaning, and the exposed The metal matrix that comes out is easily oxidized in the air and rusts again, which is not conducive to subsequent surface treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Polyoxyethylene 2-octylphenol ether-9: 4%

[0039] Sodium Bromide: 30%

[0040] Sodium citrate: 5%

[0041] Water: balance.

[0042] When in use, take the product of the above formula and about 20% hydrochloric acid to make a 1:100 cleaning solution to clean the strip steel products. After trial, the corrosion inhibition rate is 98.1%, the fog suppression rate is 92.5%, and the cleaning speed is increased by 22%. The cleaned steel strips were placed for 5 hours without producing rust spots.

Embodiment 2

[0044] Polyoxyethylene 2-octylphenol ether-10: 10%

[0045] Potassium iodide: 45%

[0046] Potassium citrate: 15%

[0047] Water: balance.

[0048] When in use, take the additive of the above formula and 25% hydrochloric acid to make a cleaning solution in a ratio of 1:100 to clean hardware products. After trial use, the corrosion inhibition efficiency reaches 97.7%, the fog suppression rate is 95.6%, and the cleaning speed is increased by 27%. The treated hardware products will not produce rust spots after being placed for 12 hours.

Embodiment 3

[0050] Polyoxyethylene 2-octylphenol ether-12: 3%

[0051] Potassium iodide: 30%

[0052] Citric acid: 6%

[0053] Water: balance.

[0054] When in use, take the product of the above formula and about 20% hydrochloric acid to make a 1:100 cleaning solution to clean the angle steel components. After trial use, the corrosion inhibition rate reaches 98.5%, the fog suppression rate is 90.6%, and the cleaning speed is increased by 25%. The angle steel components that came out did not produce rust spots after being placed for 6 hours.

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Abstract

The multifunctional hydrochloric acid pickling additive consists of polyoxyethylene ether or similar surfactant matter 1-10 %, active anion component 20-45 %, complexing agent 5-15 %, and water for the rest. It has the functions of retarding corrosion, inhibiting fog, promoting dissolution and preventing rust. It has the synergistic adsorption effect of both surfactant and active anion to form stable single molecular adsorption layer on the surface of the metal substrate to retard corrosion during pickling and prevent rust after cleaning; and the bubble and corrosion retarding layer the surfactant forms on the surface of the cleaning liquid to inhibit fog and avoid 'hydrogen embrittlement'. The components in the multifunctional hydrochloric acid pickling additive have low or no toxicity toensure the safety of the pickling process.

Description

technical field [0001] The invention belongs to the technical field of steel products and material surface treatment industry, and in particular relates to a multifunctional hydrochloric acid pickling additive. Background technique [0002] In order to realize the anticorrosion, decoration or other functions of steel products and materials, it is necessary to treat the surface of steel products or materials, and steel products or materials are often caused by corrosion, pollution or other problems during the process of manufacturing, processing, transportation and storage. Reasons, etc., are covered with rust or dirt on the surface of steel. Therefore, cleaning metal products or materials is an important part of surface treatment, and cleaning quality and efficiency are the key links that determine surface treatment. Hydrochloric acid is a commonly used surface cleaning solution. It not only has a strong dissolving ability for the corrosion of metal surfaces, but also has a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
Inventor 汤兵王静
Owner GUANGDONG UNIV OF TECH
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