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Novel stainless steel pickling-passivating solution and pickling-passivating process thereof

A technology of pickling passivation and stainless steel, applied in the direction of metal material coating process, etc., can solve the problems of slow pickling speed, influence of material mechanical properties, poor stability, etc.

Inactive Publication Date: 2016-02-17
SUZHOU GAIDE FINE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its stability is poor, the pickling speed is slow, and the mechanical properties of the treated material are affected.

Method used

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  • Novel stainless steel pickling-passivating solution and pickling-passivating process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A novel stainless steel pickling passivation solution, in parts by weight, comprises the following components:

[0038] 30 parts of hydrogen peroxide, 20 parts of hydrofluoric acid,

[0039] 5 parts of citric acid, 3 parts of thiourea derivatives,

[0040] 2 parts of octylphenol polyoxyethylene ether, 50 parts of deionized water,

[0041] 1 part of silane coupling agent, 5 parts of polyaspartic acid,

[0042] 3 parts of polyacrylamide, 5 parts of gallic acid.

[0043] Its pickling passivation process includes the following steps:

[0044] (1) Degreasing; put the stainless steel workpiece completely into the bath, control the temperature at 25°C, and ultrasonicate for 3 minutes;

[0045] (2) Rinse the stainless steel workpiece soaked in ultrasound with a high-pressure water gun at room temperature;

[0046] (3) stainless steel workpiece is soaked in the pickling passivation solution described in claim 1, and control temperature is 25 ℃, and immersion time is 30min; ...

Embodiment 2

[0049] A novel stainless steel pickling passivation solution, in parts by weight, comprises the following components:

[0050] 40 parts of hydrogen peroxide, 30 parts of hydrofluoric acid,

[0051] 15 parts of citric acid, 7 parts of thiourea derivatives,

[0052] 8 parts of octylphenol polyoxyethylene ether, 80 parts of deionized water,

[0053] 5 parts of silane coupling agent, 10 parts of polyaspartic acid,

[0054] 8 parts of polyacrylamide, 12 parts of gallic acid.

[0055] Its pickling passivation process includes the following steps:

[0056] (1) Degreasing; put the stainless steel workpiece completely into the bath, control the temperature at 50°C, and ultrasonicate for 5 minutes;

[0057] (2) Rinse the stainless steel workpiece soaked in ultrasound with a high-pressure water gun at room temperature;

[0058] (3) stainless steel workpiece is soaked in the pickling passivation solution described in claim 1, and control temperature is 50 ℃, and immersion time is 60m...

Embodiment 3

[0061] A novel stainless steel pickling passivation solution, in parts by weight, comprises the following components:

[0062] 32 parts of hydrogen peroxide, 22 parts of hydrofluoric acid,

[0063] 7 parts of citric acid, 4 parts of thiourea derivatives,

[0064] 4 parts of octylphenol polyoxyethylene ether, 60 parts of deionized water,

[0065] 2 parts of silane coupling agent, 6 parts of polyaspartic acid,

[0066] 4 parts of polyacrylamide, 7 parts of gallic acid.

[0067] Its pickling passivation process includes the following steps:

[0068] (1) Degreasing; put the stainless steel workpiece into the bath completely, control the temperature at 30°C, and ultrasonicate for 4 minutes;

[0069] (2) Rinse the stainless steel workpiece soaked in ultrasound with a high-pressure water gun at room temperature;

[0070] (3) stainless steel workpiece is soaked in the pickling passivation solution described in claim 1, and control temperature is 30 ℃, and immersion time is 40min; ...

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Abstract

The invention discloses novel stainless steel pickling-passivating solution. The novel stainless steel pickling-passivating solution comprises the following components in parts by weight: 30-40 parts of hydrogen peroxide, 20-30 parts of hydrofluoric acid, 5-15 parts of citric acid, 3-7 parts of thiourea derivatives, 2-8 parts of octaphenyl polyoxyethyiene, 50-80 parts of deionized water, 1-5 parts of a silane coupling agent, 5-10 parts of polyaspartic acid, 3-8 parts of polyacrylamide, and 5-12 parts of gallic acid. The invention further discloses a pickling-passivating process thereof. The stainless steel pickling-passivating solution does not contain nitric acid and inorganic strong acid, can achieve integration of a pickling function and a passivating function, and can effectively improve the corrosion resistance of stainless steel surfaces; the process is simple and has no special requirements on operation environment; and the stainless steel pickling-passivating solution is widely applicable to elimination for iron rust, welding spots, oil stain, and black and yellow oxide skins generated during the processes of formation, assembly, welding and the like, and comprehensive passivation for stainless steel workpieces.

Description

Technical field: [0001] The invention relates to the technical field of surface treatment, in particular to a novel stainless steel pickling passivation solution. Background technique: [0002] Stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature resistance and excellent mechanical and processability, so it is widely used in chemical industry. Petroleum, power, nuclear engineering, aerospace, ocean, medicine, light industry, textile and other departments. Corrosion resistance is the most important feature of stainless steel. In addition to the difference in material itself, its performance mainly depends on the quality of the passivation film formed on the surface of stainless steel. If the film is incomplete or defective, stainless steel will still be corroded. Stainless steel equipment In the process of forming, assembly, welding, weld seam inspection and construction marking, surface oil, rust, non-metallic pollutants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08C23C22/34
Inventor 李晓明
Owner SUZHOU GAIDE FINE MATERIALS CO LTD
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