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Passivation technology of steam turbine vane

A steam turbine blade and process technology, applied in the direction of metal material coating process, can solve the problems of large pollution, high energy consumption, easy discoloration, etc., and achieve the effects of improving work efficiency, saving time, and stable product quality

Inactive Publication Date: 2014-12-24
无锡杨市表面处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its defect is that it can usually be felt with eyes and hands
Due to the high environmental pollution and high energy consumption of high-temperature operation, although the corrosion resistance of the treated parts has been improved, the polished color of the stainless steel surface is greatly reduced, and it is even very easy to change color. The process is not easy to master
[0004] Based on the above situation, although there has been some research on the passivation of martensitic stainless steel so far, there is still no passivation solution that is environmentally friendly, has strong corrosion resistance, and can protect the luster of parts from being damaged. Martensitic stainless steels, especially the passivation needs of steam turbine blades

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A passivation process for steam turbine blades, the passivation solution used in the process consists of the following components in weight percentage: 10% oxalic acid, 17% tartaric acid, 2.5% zinc nitrate, 5% sodium bicarbonate, Mannich base 3 %, quinoline quaternary ammonium salt 4%, urotropine 1%, thiourea 1.5%, and the balance is water; the passivation process is to polish the machined steam turbine blade surface, remove grease, and water After cleaning, put the clean steam turbine blade into the passivation solution with the above composition, make it passivated at 45°C for 60 minutes, then take it out and rinse it with clean water.

Embodiment 2

[0013] A passivation process for steam turbine blades, the passivation solution used in the process consists of the following components in weight percentage: 14% oxalic acid, 13% tartaric acid, 3.5% zinc nitrate, 3% sodium bicarbonate, Mannich base 5 %, quinoline quaternary ammonium salt 2%, urotropine 2%, thiourea 0.5%, and the balance is water; the passivation process is to polish the machined steam turbine blade surface, remove grease, and water After cleaning, put the clean steam turbine blade into the passivation solution with the above composition, make it passivated at 55°C for 40 minutes, then take it out and rinse it with clean water.

Embodiment 3

[0015] A passivation process for steam turbine blades, the passivation solution used in the process consists of the following components in weight percentage: 12% oxalic acid, 15% tartaric acid, 3.0% zinc nitrate, 4% sodium bicarbonate, 4% Mannich base %, quinoline quaternary ammonium salt 3%, urotropine 1.5%, thiourea 1.0%, and the balance is water; the passivation process is to polish the machined steam turbine blade surface, remove grease, and water After cleaning, put the clean steam turbine blade into the passivation solution with the above composition, make it passivated at 50°C for 50 minutes, then take it out and rinse it with clean water.

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PUM

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Abstract

The invention discloses a passivation technology of a steam turbine vane. A passivation solution adopted in the process comprises the following components in percentage by mass: 10%-14% of oxalic acid, 13%-17% of tartaric acid, 2.5%-3.5% of zinc nitrate, 3%-5% of sodium bicarbonate, 3%-5% of Manny base, 2%-4% of quinoline quaternary ammonium salt, 1%-2% of urotropin, 0.5%-1.5% of thiourea and the balance of water. The passivation technology comprises the following steps: polishing the surface of the machined steam turbine vane; removing grease; cleaning by water, and then putting the cleaned steam turbine vane into the passivation solution comprising the components, so that the temperature of the steam turbine vane is 45-55 DEG; passivating for 40-60 minutes, and then taking out the steam turbine vane; and cleaning the steam turbine vane with clean water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a passivation process for steam turbine blades. Background technique [0002] Steam turbine blades are mainly made of martensitic stainless steel. This type of steel has low corrosion resistance due to its high hardenability and high carbon content. Therefore, the workpiece after machining must be treated with anti-rust treatment to effectively prevent Rust, there are generally two anti-rust methods commonly used now: one is the traditional method of applying anti-rust oil to physically seal the surface of the parts, and using the oil film to isolate the metal from the oxygen in the air to achieve anti-corrosion effects. Both have good rust resistance. But the defect of its existence is: usually can feel its existence with vision and hand. It is impossible to completely maintain the appearance and dimensional accuracy of the parts, and we know that most anti-rust oils...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/46
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司