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Phosphate passivation treatment method resistant to chlorine-containing subcritical water corrosion

A passivation treatment and subcritical water technology, applied in the coating process of metal materials, etc., can solve problems such as subcritical area corrosion, and achieve the effect of mild treatment process conditions, good corrosion resistance, and simple operation

Active Publication Date: 2019-11-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is little research on the phosphate passivation pretreatment of alloys in subcritical environments. There is no phosphate passivation pretreatment method that can effectively solve the corrosion problem in the subcritical region of chlorine-containing supercritical water oxidation systems.

Method used

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  • Phosphate passivation treatment method resistant to chlorine-containing subcritical water corrosion
  • Phosphate passivation treatment method resistant to chlorine-containing subcritical water corrosion

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The reagent used for passivation treatment is 1500mg / L Na 3 PO 4 solution, the passivation temperature is 450°C, the passivation pressure is 25MPa, and the passivation time is 50h.

[0027] Select 316 stainless steel as the base alloy, process the alloy into a cuboid sample coupon of 10mm×10mm×7mm, use metallographic sandpaper and diamond polishing agent with a particle size of 1 μm to mechanically polish all the outer surfaces of the sample, and use the sandpaper in order of 400 Mesh, 600 mesh, 800 mesh, 1200 mesh, 1600 mesh, the surface of the polished sample should be a smooth mirror surface without obvious flaws or scratches, then put the sample in acetone solution for ultrasonic cleaning for 20 minutes and then dry it for later use .

[0028] Passivate the above sample in a high-temperature and high-pressure reactor, and add 1500 mg / L of Na in the reactor. 3 PO 4 Solution, hang the spare sample in the center of the reactor with a thin silver wire and avoid cont...

Embodiment 2

[0032] The reagent used for passivation treatment is 1800mg / L Na 3 PO 4 solution, the passivation temperature is 430°C, the passivation pressure is 24MPa, and the passivation time is 150h.

[0033]Select 316 stainless steel as the base alloy, process the alloy into a cuboid sample coupon of 10mm×10mm×7mm, use metallographic sandpaper and diamond polishing agent with a particle size of 1 μm to mechanically polish all the outer surfaces of the sample, and use the sandpaper in order of 400 Mesh, 600 mesh, 800 mesh, 1200 mesh, 1600 mesh, the surface of the polished sample should be a smooth mirror surface without obvious blemishes or scratches, then put the sample in acetone solution for ultrasonic cleaning for 25 minutes and then dry it for later use .

[0034] Passivate the above sample in a high-temperature and high-pressure reactor, and add 1800 mg / L of Na in the reactor. 3 PO 4 Solution, hang the spare sample in the center of the reactor with a thin silver wire to avoid c...

Embodiment 3

[0037] The reagent used for passivation treatment is 2000mg / L Na 3 PO 4 solution, the passivation temperature is 400°C, the passivation pressure is 23MPa, and the passivation time is 500h.

[0038] Select 316 stainless steel as the base alloy, process the alloy into a cuboid sample coupon of 10mm×10mm×7mm, use metallographic sandpaper and diamond polishing agent with a particle size of 1 μm to mechanically polish all the outer surfaces of the sample, and use the sandpaper in order of 400 Mesh, 600 mesh, 800 mesh, 1200 mesh, 1600 mesh, the surface of the polished sample should be a smooth mirror surface without obvious flaws or scratches, then put the sample in acetone solution for ultrasonic cleaning for 30 minutes and then dry it for later use .

[0039] Passivate the above sample in a high-temperature and high-pressure reactor, and add 2000 mg / L of Na in the reactor. 3 PO 4 Solution, hang the spare sample in the center of the reactor with a thin silver wire and avoid con...

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Abstract

The invention discloses a phosphate passivation treatment method resistant to chlorine-containing subcritical water corrosion. The method comprises the following steps that alloy to be treated is polished to achieve the mirror surface and then is ultrasonically cleaned by using an acetone solution; passivation treatment is carried out on the alloy by adopting a high-temperature high-pressure reaction kettle according to the raw materials and the environment; and the alloy is taken out after the treatment is finished, is ultrasonically cleaned by using deionized water and the acetone solution,and is finally placed in air to be naturally cooled to prepare the corrosion-resistant alloy subjected to the phosphate passivation treatment. The method has the advantages that the operation is simple, the treatment process conditions are mild, the alloy obtained through the phosphate passivation treatment has excellent chlorine-salt-containing subcritical water corrosion resistance, 316 stainless steel treated by using the method shows good corrosion resistance after being exposed for 50 hours in the subcritical water which contains NaCl (330 mg / L) and H2O2 (3500 mg / L) at the temperature of100-300 DEG C and the pressure of 25 MPa, and is superior to the corrosion resistance of the 316 stainless steel which is not treated by using the method.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a phosphate passivation treatment method, in particular to a phosphate passivation treatment method resistant to corrosion by chlorine-containing subcritical water. Background technique [0002] Supercritical water oxidation is an advanced oxidation technology that can efficiently and thoroughly treat high-concentration refractory organic wastewater in oxygen-containing supercritical water. It has fast reaction speed, high treatment efficiency, no secondary pollution, no need for high-energy drying process, When the concentration of organic matter exceeds 3%, the technical and economic advantages of self-heating, low investment and operation costs can be realized. However, the extreme environment of high temperature, high pressure and high oxygen content and the existence of corrosive substances lead to serious corrosion problems in the supercritical water oxidation system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/73C23C22/78C23C22/82
CPCC23C22/05C23C22/73C23C22/78C23C22/82
Inventor 徐东海郭树炜梁钰王瀚马志江
Owner XI AN JIAOTONG UNIV
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