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Chemical pretreatment method of steel products and used pickling solution

A kind of pickling solution and chemical technology, which is applied in the field of rust removal, phosphating process and used pickling solution and oil removal, to achieve the effect of simple process, less process and lower equipment investment.

Active Publication Date: 2014-02-12
ZOOMLION HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And provide a pickling solution to solve the problem of the acid solution left on the steel surface after pickling and the degreasing solution behind

Method used

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  • Chemical pretreatment method of steel products and used pickling solution
  • Chemical pretreatment method of steel products and used pickling solution
  • Chemical pretreatment method of steel products and used pickling solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare pickling solution:

[0028]

[0029] The mass concentration of sulfuric acid used was 19%.

[0030] The workpiece is immersed in the pickling solution prepared at 30°C for 5 minutes. The concentration of the surfactant anionic fatty alcohol polyoxyethylene ether sodium sulfate in the pickling solution is 10g / L. The rust on the steel surface is removed to expose the original metal color, and the liquid is drained for 2 minutes; Soak in the 30°C degreasing solution for 3 minutes. The degreasing solution contains coarse-grained alkali with a mass concentration of 25% and anionic polyacrylamide with a mass concentration of 0.5%. Temperature 30°C, soak for 1min, drain for 1min; soak in 30°C ferric molybdate phosphating solution for 3min, the surface of the treated workpiece will be colored.

Embodiment 2

[0032] Prepare pickling solution:

[0033]

[0034] The mass concentration of sulfuric acid used was 17%.

[0035] Soak the workpiece in the prepared pickling solution at 18°C ​​for 4 minutes. The concentration of surfactant anionic fatty alcohol polyoxyethylene ether sodium sulfate in the pickling solution is 10g / L. The rust on the steel surface is removed to reveal the original color of the metal. Drain 2min; soak in 18°C ​​degreasing solution for 4min, the degreasing solution contains coarse-grained alkali with a mass concentration of 35% and anionic polyacrylamide with a mass concentration of 0.3%. Water washing process, the temperature is 18°C, soaking for 1min, draining for 1min; soaking in 18°C ​​iron molybdate phosphating solution for 4min, the surface of the workpiece after treatment is colored.

Embodiment 3

[0037] Prepare pickling solution:

[0038]

[0039] The mass concentration of sulfuric acid used was 15%.

[0040] The workpiece is immersed in the prepared pickling solution at 5°C for 3 minutes. The concentration of the surfactant anionic fatty alcohol polyoxyethylene ether sodium sulfate in the pickling solution is 10g / L. The rust on the steel surface is removed to reveal the original color of the metal. 2min; Soak in the degreasing bath at 5°C for 5min. The degreasing solution contains coarse-grained alkali with a mass concentration of 45% and anionic polyacrylamide with a mass concentration of 0.1%. Water washing process, the temperature is 5°C, soaking for 1min, draining for 1min; soaking in 5°C iron molybdate phosphating solution for 5min, the surface of the workpiece after treatment is colored.

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Abstract

The invention discloses a chemical pretreatment method of steel products and a used pickling solution. The chemical pretreatment method of steel products comprises four procedures of pickling, degreasing, washing, and phosphorizing, wherein coarse alkali is adopted in degreasing fluid; acrylonitrile-ethylene-styrene (AES) and anionic polyacrylamide (APAM) surfactants are respectively utilized to solve the demands of a normal temperature process on an active agent in the pickling and degreasing procedures; molybdate iron phosphating liquid is adopted in phosphorization; the used acid liquor comprises the following components in grams per liter: 101-135 g / L of sulfuric acid, 3 g / L of potassium rhodanide, 3 g / L of teiethylene tetramine-hexacetic acid, 3 g / L of acetamidine hydrochloride and 3 g / L of di-o-tolyl-thiourea; the mass concentration of the sulfuric acid is 15-19%. The method is simple in process, fewer in procedures, and free of an external heating device; about 80% of water can be saved; equipment investment can be reduced; about 70% of electricity can be saved in normal operation.

Description

technical field [0001] The invention relates to the technical field of chemical pretreatment methods for steel, in particular to a steel degreasing, derusting, phosphating process and the pickling solution used. Background technique [0002] In the normal steel chemical pretreatment production line, in the process of degreasing, derusting and phosphating of steel, the oil stain on the surface of the steel is removed before derusting, and then the rust on the surface of the steel is removed by pickling. The chemical changes in the degreasing tank include saponification reaction, emulsification reaction and complexation reaction. After entering the pickling tank, the residual degreasing liquid will react with the acid solution, causing the parameters in the pickling tank to drop sharply. In addition, after the pickling is completed, it is necessary to neutralize the residual acid ions on the surface of the steel, followed by surface adjustment and phosphating. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): C23G1/02
Inventor 王金富王喜恩刘洪岩李洪全孙传明
Owner ZOOMLION HEAVY MASCH CO LTD
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