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A kind of pickling solution containing compound passivating agent and preparation method thereof

A technology of passivating agent and pickling solution, which is applied in the field of aluminum cleaning, can solve the problems of strong carcinogenicity, operator and environmental hazards, etc., and achieve the effect of large amount of pickling, low cost of acid treatment, and shortening the frequency of pickling

Active Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be ignored that the hexavalent chromium contained in the chromic acid lotion has strong carcinogenicity and is harmful to operators and the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: sample preparation

[0019] The pickling solution containing passivating agent used in the following examples is prepared by the following method: getting 1000kg of concentration is 50% industrial nitric acid, adding corrosion inhibitors (comprising urotropine 25kg, sulfamic acid 25kg, sulfamic acid Sodium 62.5kg (one or several mixtures) and brightener (including triethylene glycol 12.5kg, coumarin, saccharin, glycerin 6.2kg and alkane surfactant 25kg one or several mixtures), and finally in Add water 81kg in the solution, stir well. Placed at 25°C, reacted for 24 hours. The final solution was light yellow and clear. The preparation is complete and ready for use.

Embodiment 2

[0020] Embodiment 2: sample preparation

[0021] The pickling solution that contains passivating agent used in the following examples is prepared by the following method: get 1000kg50% industrial nitric acid, add corrosion inhibitor successively (by urotropine 12.5kg, sulfamic acid 12.5kg, sulfamic acid Sodium 12.5kg (composed of one or several mixtures) and brightener (composed of one or several mixtures of triethylene glycol 11.2kg, coumarin 2.5kg, saccharin 2.5kg, glycerin 2.5kg and alkane surfactant 6.2kg ), and finally add 11400kg of water into the solution and stir evenly. Placed at 25°C, reacted for 24 hours. The final solution was light yellow and clear. The preparation is complete and ready for use.

Embodiment 3

[0022] Example 3: Sample Preparation

[0023] The pickling solution that contains passivating agent used in the following examples is prepared by the following method: getting 1000kg of concentration is 50% industrial nitric acid, after stirring, add compound passivating agent (by urotropine 14.3kg, sulfamic acid 2.8kg sodium sulfamate, 1.4kg sodium sulfamate, 2.1kg triethylene glycol, 0.4kg coumarin, 0.4kg saccharin, 0.7kg glycerin and 0.7kg alkane surfactant (one or more mixtures), and finally in the solution Add 400kg of water to the mixture and stir evenly. Placed at 25°C, reacted for 24 hours. The final solution was light yellow and clear. The preparation is complete and ready for use.

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PUM

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Abstract

The invention belongs to the field of aluminum product cleaning, and relates to a pickling solution which is compounded in a way of adding an organic substance to an HNO3 solution and has a passivation effect. The pickling solution which contains a compound passivating agent comprises the following components in percentage by weight: 4.0%-45.0% of nitric acid, 0.5%-13.5% of compound passivating agent and the balance of water. A polluted aluminum product regains metallic luster after being cleaned with the pickling solution and a compact passive film is formed on the surface of the aluminum product so that the aluminum product can still keep bright as silver and beautiful without getting darkened after being stored for a long time. The pickling solution disclosed by the invention has another characteristic of little acid mist, which is favorable to environmental protection and the body health of operators; in addition, the pickling amount is large and the acid treatment cost is low.

Description

technical field [0001] The invention belongs to the technical field of aluminum material cleaning, and relates to a pickling solution containing a compound passivating agent for cleaning various aluminum materials, especially hard aluminum alloys such as 2A12 type, and a preparation method thereof. Background technique [0002] At present, the cleaning process of aluminum is mainly pickling, and the main components are sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, chromic acid, etc., which are prepared by adding different additives according to different proportions. However, in practice, the existing pickling process has the disadvantages of large acid consumption, large acid mist, short waste acid discharge cycle, and long-term operation is poisonous to human body. The current pickling solution tends to add different substances to the acid to stabilize the acid solution, promote cleaning, and slow the release of aluminum, so that the aluminum can be pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/12
CPCC23G1/065C23G1/125
Inventor 李艳荣朱立忠陆建国李忠建朱伟
Owner CHINA PETROLEUM & CHEM CORP
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