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Pickling-rinsing additive and preparation method thereof

An additive and pickling technology, applied in the chemical and chemical field, can solve the problems of incomplete, discontinuous, and large waste water pollution of the passivation film, and achieve the effect of reducing the number of maintenance, reducing losses, and improving product quality.

Inactive Publication Date: 2011-11-09
天津惠邦同成科技发展有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

There are many pickling methods, using EDTA, HNO 3 、H 3 PO 4 The one-step pickling and passivation process carried out by others is one of them. This process has strict requirements on conditions such as temperature and PH value. A little carelessness will cause the passivation film to be incomplete and discontinuous.
Moreover, this process is based on the use of the rinsing process, which is relatively independent from the pickling process, and the wastewater discharged at the same time is more polluted

Method used

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  • Pickling-rinsing additive and preparation method thereof

Examples

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Embodiment 1

[0032] Take 50 parts of water, 5 parts of sulfuric acid, 6 parts of coal tar extract, and 5 parts of polyaspartic acid for later use. Put water into the reaction kettle, start the reaction kettle to stir; add sulfuric acid slowly, stir thoroughly after the dropwise addition, raise the temperature to 60°C, add coal tar extract into the reaction kettle, stir evenly, raise the temperature to 75°C, keep stirring 4 hours. Add polyaspartic acid into the kettle, naturally cool down to 35°C under stirring, discharge the material, and filter through a 120-140 mesh filter to obtain the mother liquor. Take 50 parts of mother liquor, 12 parts of fatty alcohol polyoxyethylene ether, and 10 parts of betaines and add them into the reaction kettle respectively, and stir for 2 hours at normal temperature to obtain Agent A of the present invention;

[0033] Take 50 parts of high-molecular alcohols, 2 parts of sulfuric acid, 8 parts of AEO-9, 2-3 parts of aminopropionic acid, put the high-molec...

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Abstract

The invention discloses an environment-friendly pickling or passivation additive used in the hydrochloric acid pickling process. The additive consists of an additive A and an additive B, and is prepared by the method of the invention. The additive of the invention has the advantages of simplifying the process of surface treatment, completing pickling and passivation in one step, effectively accelerating cleaning and reducing iron loss, omitting a rinsing process in a chemical cleaning process and solving the problem of strict requirements for pH and temperature in a one-step passivation process.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to an environment-friendly additive for pickling or passivation in the process of hydrochloric acid pickling. Background technique [0002] In industrial production, in order to prevent narrowing and clogging of pipelines, it is often necessary to clean and dredge them. Pickling is a relatively common method. There are many pickling methods, using EDTA, HNO 3 、H 3 PO 4 The one-step pickling and passivation process carried out by the company is one of them. This process has strict requirements on conditions such as temperature and PH value, and a little carelessness will cause the passivation film to be incomplete and discontinuous. Moreover, this process is based on the use in the rinsing process, which is relatively independent from the pickling process, and the wastewater discharged at the same time is more polluted. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08
Inventor 王雷
Owner 天津惠邦同成科技发展有限公司
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