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Pickling passivation method of stainless steel

A pickling passivation, stainless steel technology, applied in the direction of metal material coating process, etc., can solve the problems affecting the decoration of stainless steel surface, etc., to improve the performance of anti-fingerprint pollution, less environmental pollution, and ensure the effect of surface decoration

Active Publication Date: 2013-03-13
SHENYANG YUANDA ALUMINUM IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current pickling and passivation processes are divided into two steps: pickling and passivation. The ratio of pickling solution used is: 20% nitric acid + 5% hydrofluoric acid + 75% water, Proportion: 5% nitric acid + 2% potassium dichromate + 93% pure water, and the surface of stainless steel products after pickling and passivation is silvery white, which affects the surface decoration of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Y-shaped boom parts of an overseas ADIC project, material: duplex stainless steel, surface condition sandblasting.

[0011] The specific operation steps of pickling passivation are as follows.

[0012] ⑴For degreasing, use a special spreader tool to immerse the workpiece completely in the alkaline bath liquid, liquid temperature: 30°C, soaking time: 5 minutes; PH= 9.0; when the workpiece is lifted up and down repeatedly shake it several times, use the tool to lift the workpiece Tilt, pour out the liquid in the cavity, and then use a brush to remove surface dirt.

[0013] ⑵ For the first flushing, use a special spreader tool to move the workpiece to the flushing tank for suspension, adjust the pressure of the high-pressure water gun, first flush the inner cavity of the boom, and then clean the outer surface of the boom, just visually observe and clean. Temperature: room temperature.

[0014] ⑶ Pickling and passivation, use special lifting tools to immerse the...

Embodiment 2

[0031] Stainless steel castings for an overseas project, material: 316 stainless steel castings, surface condition sandblasting.

[0032] The specific operation steps of pickling passivation are as follows.

[0033] ⑴For degreasing, use a special spreader tool to completely immerse the workpiece in the alkaline bath. Liquid temperature: 50°C, soaking time: 5 minutes; PH = 9.0; when the workpiece is lifted, shake it up and down several times, and use a brush to remove surface dirt.

[0034] (2) For the first flushing, use a special spreader tool to move the workpiece to the flushing tank and suspend it, adjust the pressure of the high-pressure water gun, focus on flushing the inner corner of the workpiece, and visually observe and clean it. Temperature: room temperature.

[0035] ⑶ Pickling and passivation, use special lifting tools to immerse the workpiece completely in the bath solution, the ratio of the special pickling and passivation solution: 20% nitric acid +...

Embodiment 3

[0052] An overseas telecommunications project Stainless steel step frame parts, material: stainless steel 316L, surface 240# wire drawing state.

[0053] The specific operation steps of pickling passivation are as follows.

[0054] ⑴For degreasing, use a special spreader tool to completely immerse the workpiece in the alkaline bath. Liquid temperature: 30°C, soaking time: 5 minutes; PH = 9.0; when the workpiece is lifted, shake it up and down repeatedly several times, and use a brush to remove surface dirt.

[0055] (2) For the first flushing, use a special spreader tool to move the workpiece to the flushing tank and suspend it, adjust the pressure of the high-pressure water gun, focus on flushing the inner corner of the workpiece, and visually observe and clean it. Temperature: room temperature.

[0056] ⑶ Pickling and passivation, use special lifting tools to immerse the workpiece completely in the bath, the ratio of the special pickling and passivation solution:...

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PUM

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Abstract

A pickling passivation method of stainless steel is characterized in that the method comprises the following steps of: (1) oil removing; (2) first rinsing; (3) pickling passivation, wherein a specially-prepared pickling passivating solution is proportioned by 20% of nitric acid, 10% of hydrofluoric acid, and 70% of purified water, and the workpiece is soaked in groove liquid completely; (4) second rinsing; (5) meutralization by alkali liquor, wherein the workpiece is soaked in an alkaline groove liquid completely; (6) first water washing; (7) third rinsing; (8) air drying; (9) stoving; (10) confining liquid spraying; (11) natural air drying; (12) packaging with air-cushion films. The invention combines two original steps of pickling and passivation into one step, which effectively increases the corrosion resistance of the stainless steel, improves the hand fingerprint contamination resistance of the stainless steel, ensures the surface decoration performance of the stainless steel products, and the method has the characteristics of simple process, low production cost, less environment pollution, easy operation, low labor intensity, low energy consumption, and high efficiency.

Description

technical field [0001] The present invention relates to a surface treatment method for stainless steel plates, in particular to a stainless steel pickling passivation method that can effectively improve the corrosion resistance of stainless steel, improve the anti-fingerprint pollution performance of stainless steel, and ensure the surface decoration of stainless steel products. The invention belongs to the technical field of surface treatment of stainless steel plates. Background technique [0002] After stainless steel products are processed, most products need to be pickled and passivated to ensure the corrosion resistance of stainless steel products. Most of the current pickling and passivation processes are divided into two steps: pickling and passivation. The ratio of pickling solution used is: 20% nitric acid + 5% hydrofluoric acid + 75% water, Proportion: 5% nitric acid + 2% potassium dichromate + 93% pure water, and the surface of stainless steel products after pic...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23C22/50
Inventor 单红伟
Owner SHENYANG YUANDA ALUMINUM IND GROUP
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