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Stainless steel acid pickling technology

A stainless steel and pickling technology, which is applied in the field of stainless steel, can solve the problems of polluting the environment, endangering human health, and damaging the accuracy and service life of equipment, and achieves the goals of less environmental pollution, improved corrosion resistance, and improved anti-fingerprint pollution performance Effect

Inactive Publication Date: 2015-03-11
QINGDAO DUANYI METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, a large amount of acid mist will be produced in the pickling process, which not only pollutes the environment, damages the accuracy and service life of the equipment, but also endangers human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, a stainless steel pickling process, including the following steps:

[0024] (1) The workpiece is completely immersed in the pickling tank, temperature control range: 30℃, time control range: 3 minutes;

[0025] (2) Rinse with clean water;

[0026] (3) Pickling, using a mixed solution of HNO3 and HF as the pickling solution, where HNO3 content is 180g / l, HF content is 26g / l, metal ion content is 5g / l, and the pre-pickling solution temperature is 55°C ; The workpiece is completely immersed in the pickling tank, temperature: 20℃;

[0027] (4) Use water to rinse the surface of the workpiece to flush the residual HNO3 solution on the surface of the workpiece;

[0028] (5) Alkaline solution is neutralized, the workpiece is completely immersed in the alkaline pickling tank, temperature control range: 92℃, time control range: 12 minutes, flip 3 times;

[0029] (6) Rinse with 300m3 / h room temperature water, then pickling;

[0030] (7) After pickling for a period of time, tran...

Embodiment 2

[0035] Embodiment 2, a stainless steel pickling process, including the following steps:

[0036] (1) The workpiece is completely immersed in the pickling tank, the temperature control range is 45℃, and the time control range: 4 minutes;

[0037] (2) Rinse with clean water;

[0038] (3) Pickling, using a mixed solution of HNO3 and HF as the pickling solution, where HNO3 content is 240g / l, HF content is 45g / l, metal ion content is 33 / l, and the pre-pickling solution temperature is 60℃ ; The workpiece is completely immersed in the pickling tank, temperature: 25℃;

[0039] (4) Use water to rinse the surface of the workpiece to flush the residual HNO3 solution on the surface of the workpiece;

[0040] (5) Alkaline solution neutralization, the workpiece is completely immersed in the alkaline pickling tank, temperature control range: 100℃, time control range: 16 minutes, turning 4 times;

[0041] (6) Rinse with 340m3 / h room temperature water, then pickling;

[0042] (7) After pickling for a per...

Embodiment 3

[0047] Embodiment 3, a stainless steel pickling process, including the following steps:

[0048] (1) The workpiece is completely immersed in the pickling tank, temperature control range: 55℃, time control range: 5 minutes;

[0049] (2) Rinse with clean water;

[0050] (3) Pickling, using a mixed solution of HNO3 and HF as the pickling solution, in which the HNO3 content is 290g / l, the HF content is 60g / l, the metal ion content is 45g / l, and the pre-pickling solution temperature is 65°C ; The workpiece is completely immersed in the pickling tank, temperature: 30℃;

[0051] (4) Use water to rinse the surface of the workpiece to flush the residual HNO3 solution on the surface of the workpiece;

[0052] (5) Alkali solution neutralization, the workpiece is completely immersed in the alkaline pickling tank, temperature control range: 110℃, time control range: 18 minutes, turning 5 times;

[0053] (6) Rinse with 360m3 / h room temperature water, then pickling;

[0054] (7) After pickling for a pe...

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Abstract

The invention discloses a stainless steel acid pickling technology which comprises steps as follows: (1) completely immersing a workpiece in an acid pickling tank at the temperature of 30-55 DEG C for 3-5 min; (2) washing the workpiece with clear water; (3) performing acid pickling with an HNO3 and HF mixed solution used as an acid pickling solution, wherein the content of HNO3 is in a range of 180-290 g / l, the content of HF is in a range of 26-60 g / l, the content of metal ions is in a range of 5-45 g / l, and the temperature of the acid pickling solution is in a range of 55-65 DEG C. With the adoption of the stainless steel acid pickling technology, the corrosion resistance of stainless steel is improved effectively, the fingerprint contamination resistance of the stainless steel is improved, and the surface decoration property of stainless steel products is guaranteed; the technology has the characteristics of simplicity, low production cost, low environmental pollution, easiness in operation, low labor intensity, low energy consumption and high efficiency; the defects that the stainless steel cannot be drawn to be fine and is brittle and easy to break are overcome.

Description

Technical field [0001] The invention relates to the technical field of stainless steel, and in particular to a stainless steel pickling process. Background technique [0002] Pickling generally refers to a method of cleaning metal surfaces. Generally, the parts are immersed in an aqueous solution such as sulfuric acid to remove oxide and other films on the metal surface. It is a pre-treatment or intermediate treatment for electroplating, enamel, rolling and other processes, and some are also used as post-treatment in steel rolling mills. [0003] Among stainless steel products, the pickling process of 300 series stainless steel such as 304, 316L and 321 is the most representative. 300 series stainless steel is single-phase austenitic stainless steel. Because it contains more alloy elements such as Cr, Ni, Mo, Ti, etc., the composition and structure of the oxide scale formed during hot processing are significantly different from carbon steel. In addition to common In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
CPCC23G1/086
Inventor 吴胜杰
Owner QINGDAO DUANYI METAL
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