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Pickling solution containing compounded passivating agent, and preparation method thereof

A technology of pickling liquid and passivating agent, which is applied in the field of cleaning stainless steel castings, can solve the problems of no specific implementation plan, etc., and achieve the effects of small acid mist, large amount of pickling, and shortening the frequency of pickling

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Point out the merits of commonly used treatment methods for acid mist and adding corrosion inhibitors, and roughly compare them. The lack is that there is no specific implementation plan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: sample preparation

[0020] The pickling solution containing passivating agent used in the following examples is prepared by the following method: 1000kg concentration is 50% industrial nitric acid mixed with 200kg40% hydrofluoric acid, after stirring evenly, add corrosion inhibitor (by Uro Tropin 40kg, sulfamic acid 40kg, sodium sulfamate 100kg one or a combination of several) and brightener (composed of triethylene glycol 20kg, coumarin, saccharin, glycerin 10kg each and alkane surfactant 40kg) or several mixed compositions), and finally add 410kg of water into the solution and stir evenly. Placed at 25°C, reacted for 24 hours. The final solution was light yellow-green and clear. The preparation is complete and ready for use.

Embodiment 2

[0021] Embodiment 2: sample preparation

[0022] The pickling solution containing passivating agent used in the following examples is prepared by the following method: the industrial nitric acid of 1000kg50% is mixed with the hydrofluoric acid of 150kg40%, after stirring, add corrosion inhibitor successively (by urotropine 2.0 kg, sulfamic acid 2.0kg, sodium sulfamate 1.0kg, one or several mixtures) and brightener (composed of triethylene glycol 1.0kg, coumarin 1.0, saccharin 0.4kg, glycerin 0.4g and alkanes surface active 1.0kg of one or several mixtures), and finally add 840kg of water into the solution and stir evenly. Placed at 25°C, reacted for 24 hours. The final solution was light yellow-green and clear. The preparation is complete and ready for use.

Embodiment 3

[0023] Example 3: Sample Preparation

[0024] The pickling solution containing passivating agent used in the following examples is prepared by the following method: 1000kg concentration is 50% industrial nitric acid and 300kg40% hydrofluoric acid are mixed, after stirring, add corrosion inhibitor (by Uro Tropin 10kg, sulfamic acid 3kg, sodium sulfamate 2kg (one or several mixtures) and brightener (1.2kg of triethylene glycol, 0.5kg of coumarin, 0.5kg of saccharin, 1kg of glycerin and alkanes surface active 1.5kg of one or several mixtures), and finally add 680kg of water into the solution and stir evenly. Placed at 25°C, reacted for 24 hours. The final solution was light yellow-green 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 stainless steel casting cleaning field, and relates to a passivating pickling solution obtained through adding an organic substance to an HNO3-HF base acid solution and compounding. The pickling solution comprises 3.3-37.5mass% of HNO3, 0.7-7.5mass% of HF, 1.3-13.5mass% of the compounded passivating agent, and the balance water. A polluted stainless steel casting is cleaned by the pickling solution to recover the metal luster originally possessed by the casting. The pickling solution forms a compact passivating film on the surface of the casting, so bright beauty maintenance and no rusty spot are realized after the casting is stored for a long term. The pickling solution has the characteristics of very small acid mist, benefiting for the environmental protection and the body health of an operation personnel, large pickling amount, and low pickling cost.

Description

technical field [0001] The invention belongs to the technical field of cleaning stainless steel castings, and relates to a compound pickling solution passivator for cleaning various steel materials. Background technique [0002] At present, the cleaning process of steel is mainly pickling, and the main components are sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc., which are prepared by adding different additives according to different proportions. But in reality, the existing pickling process has the disadvantages of large acid consumption, large acid mist, and short waste acid discharge cycle. The current pickling solution tends to add different substances to the acid to stabilize the acid solution, promote cleaning, and slow-release the steel, thereby corroding the steel and prolonging the service life. [0003] There are few reports on such pickling liquid additives. Huazhong University of Science and Technology; Wuhan Yongxing Chemical Co., Ltd....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 李艳荣朱立忠李忠建陆建国侯红美
Owner CHINA PETROLEUM & CHEM CORP
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