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Acid-wash additive for iron and steel

A pickling additive and steel pickling technology, applied in the field of steel pickling additives, can solve problems such as over-corrosion, human irritation, and easily corroded equipment, and achieve the effects of preventing over-corrosion, inhibiting acid mist, and improving rust removal speed.

Inactive Publication Date: 2012-08-15
CHONGQING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrochloric acid also has the disadvantages of over-corrosion, large acid mist, easy corrosion of equipment, and serious irritation to the human body in the process of pickling and rust removal.

Method used

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  • Acid-wash additive for iron and steel

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with specific embodiments.

[0013] 1. Preparation of "FSD-7001" pickling additive

[0014] 4000 grams of "FSD-7001" pickling additive ratio:

[0015] Accelerator: oxalic acid or citric acid, 200-250g; phosphoric acid, 900-1000g;

[0016] Anionic surfactant: sodium lauryl sulfate, 200-250g;

[0017] Corrosion inhibitor: urotropine, 150-200g;

[0018] Fog suppressant: nonylphenol polyoxyethylene ether, 150-200g;

[0019] water, balance.

[0020] Preparation steps: firstly mix phosphoric acid, anionic surfactant and water and stir evenly, then add the remaining components and stir to dissolve.

[0021] 2. Performance indicators

[0022] According to "FSD-7001" pickling additive : hydrochloric acid: water=1: 5: 4 (preparation according to volume ratio, hydrochloric acid selects industrial grade for use) prepare pickling solution, its performance has been assessed in the laboratory, and the result...

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Abstract

The invention discloses an acid-wash additive for iron and steel. Every 4000g of the acid-wash additive is prepared from 200-250g of accelerator-oxalic acid or citric acid, 900-1000g of phosphoric acid, 200-250g of anionic surfactant-sodium lauryl sulfate, 150-200g of corrosion inhibitor-urotropine, 150-200g of mist inhibitor-nonylphenol polyethenoxy ether and the balance of water. The acid-wash additive is prepared by the following steps: evenly mixing phosphoric acid, anionic surfactant and water, adding the rest of components, and dissolving by stirring. The FSD-7001 acid-wash additive can further increase the derusting speed of hydrochloric acid, prevent iron and steel workpieces from generating over etching, reduce the acid consumption, inhibit acid mist, and enable the acid liquor to have certain oil removal function.

Description

technical field [0001] The invention relates to a steel pickling additive. Background technique [0002] Usually, people are accustomed to call the discoloration and corrosion of metal workpieces in the atmosphere due to the action of oxygen, moisture and other media as "rust" or "rust", and the corrosion products are collectively referred to as "rust". The loss caused by metal corrosion not only damages the metal workpiece itself in terms of its shape, color and mechanical properties, but more importantly, it reduces the quality of metal products, even affects the precision of its products, and reduces its use value, which is particularly serious. It will also cause product scrapping. Pickling and derusting is to immerse the processed steel workpiece in inorganic acid solutions such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, organic acid solutions such as citric acid, tartaric acid, or their mixed acids to dissolve the rust attached to the surface o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G1/06
Inventor 付文升黄猛施展
Owner CHONGQING NORMAL UNIVERSITY
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