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Steel hydrochloric acid pickling corrosion inhibitor

A technology of pickling corrosion inhibitor and hydrochloric acid, which is used in the fields of pickling corrosion inhibitor, hydrochloric acid pickling rust removal, boiler and other industrial equipment cleaning, and can solve the problem of unstable corrosion inhibition performance, affecting process quality, Surface roughness of steel parts and other problems, to achieve excellent wetting, improve rapid wetting, and prevent corrosion

Inactive Publication Date: 2010-05-12
南通鑫凯界面工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the change of process conditions and other factors, many corrosion inhibitors have been exposed to the disadvantages of being greatly affected by acidity and temperature, unstable corrosion inhibition performance, rough and dark surface of steel parts after pickling, localized corrosion, and serious pitting corrosion. , seriously affecting the quality of subsequent processes

Method used

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  • Steel hydrochloric acid pickling corrosion inhibitor
  • Steel hydrochloric acid pickling corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Experimental conditions: the concentration of hydrochloric acid for pickling is 8%, the pickling temperatures are 25°C and 55°C respectively, and the comparative corrosion inhibitor is IS-129 hydrochloric acid pickling corrosion inhibitor. The amount of corrosion inhibitor added is 3‰ of the mass of hydrochloric acid. The steel parts used in the experiment are A3 steel pipes. The experimental results are as follows:

[0016]

[0017] Experimental results show that the present invention can maintain its excellent corrosion inhibition performance in a wide temperature range. When the temperature continues to rise, the amount of corrosion inhibitor added can be increased according to the situation.

Embodiment 2

[0019] Experimental conditions: the concentrations of hydrochloric acid for pickling are 10% and 25% respectively, and the pickling temperature is 30°C. According to the concentration of hydrochloric acid, the addition amount of the corrosion inhibitor of the present invention is respectively 3‰ and 5‰, and the steel parts used are A3 steel pipes . The experimental results are:

[0020]

[0021] Properly adjusting the addition amount of the corrosion inhibitor of the present invention can also obtain excellent corrosion inhibition effects under different concentrations of hydrochloric acid. As the experimental results show, the corrosion inhibition rates are all above 95%.

[0022] Corrosion inhibitors using imidazoline derivatives or urotropine as corrosion inhibitors have the disadvantage of unstable corrosion inhibition performance. The reason is that imidazoline derivatives and urotropine are unstable and easy to decompose. In the present invention, by adding acetyleni...

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Abstract

The invention relates to a hydrochloric acid pickling corrosion inhibitor, mainly applied to the field of hot galvanizing pickling pretreatment, cleaning of boilers and other industrial equipment and the like. The hydrochloric acid pickling corrosion inhibitor comprises the following components by weight percent: 0-20 percent of urotropine, 0-10 percent of rosin amine polyoxyethylene ether, 0-10 percent of additive (nonionic surfactant combination), 0-5 percent of alkynol compound (one or two of propargyl alcohol, butynol and pentynol) and the balance of water. The invention has simple preparation and low cost and is mainly characterized in that firstly, the hydrochloric acid pickling corrosion inhibitor has no foam or low foam; secondly, the hydrochloric acid pickling corrosion inhibitor has high corrosion inhibition rate and fog inhibition rate both in a wider temperature range and in a wider acidity range; and thirdly, after pickling, the surface of steel has favorable conditions, is lustrous and does not have the phenomena of over-corrosion and the like. When the hydrochloric acid pickling corrosion inhibitor is used, the addition quantity of the corrosion inhibitor can be properly regulated according to the actual temperature and acidity of the pickling.

Description

technical field [0001] The invention relates to a pickling corrosion inhibitor, in particular to a corrosion inhibitor for hydrochloric acid pickling and derusting of iron and steel components, cleaning of boilers and other industrial equipment. The invention belongs to the technical field of metal surface cleaning treatment. Background technique [0002] In the processes of removing rust and oxide film on the steel surface, cleaning boilers, etc., hydrochloric acid pickling is a commonly used method, which has the lowest cost and is easy to operate. However, hydrochloric acid will also dissolve the steel itself, causing over-corrosion and wasting a lot of acid. At the same time, hydrochloric acid pickling is likely to produce a large amount of acid mist, causing environmental pollution, endangering human health, and causing corrosion to surrounding equipment. In order to solve these problems, it is necessary to add corrosion and fog inhibitors. For example: Jiang Liqiang ...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
Inventor 郑建黄伟周汉涛潘志国
Owner 南通鑫凯界面工程科技有限公司
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