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Salt bath formula and treatment method in salt bath nitriding treatment of stainless steel air-conditioning compressor blades

A technology for air-conditioning compressors and salt bath nitriding, which is used in mechanical equipment, machines/engines, liquid fuel engines, etc.

Inactive Publication Date: 2011-12-28
SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the activity of the salt bath, there are patent reports using a higher concentration of CNO - or add Li and K 2 S, but often forms a severe loose layer on the surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The pretreatment formula is (hydrochloric acid HCl (37%): water = 1: 19), activate the leaf surface for 2-5 minutes, and clean it after neutralization.

[0019] Potassium cyanate and sodium cyanate (KCNO+NaCNO) 36%, sodium carbonate (Na 2 CO 3 )15%, Potassium Carbonate (K 2 CO 3 ) 15%, sodium chloride (NaCl) 34%. Nitriding process parameters are 550°C x 420min.

Embodiment 2

[0021] The pretreatment adopts formula (sulfuric acid H 2 SO 4 (98%): water=1:9), activate the blade surface for 2-5 minutes, and clean it after neutralization.

[0022] Potassium cyanate and sodium cyanate (KCNO+NaCNO) 40%, sodium carbonate (Na 2 CO 3 )17%, Potassium Carbonate (K 2 CO 3 ) 15%, potassium chloride (KCl) 28%. Nitriding process parameters are 560°C x 400min.

[0023] The above components are available in the market.

[0024] The component of the present invention is mainly made of cyanate and carbonate, and its reaction mechanism is that cyanate reacts with oxygen to generate nitrogen and carbonate, wherein the nitrogen atom penetrates into the matrix, and the cyanate consumed along with the reaction can be It is replenished by adding regeneration salt, which can be recycled.

[0025] CNO - +O 2 →[C]+[N]+CO 3 2 -

[0026] CO 3 2- +Z (Regeneration Salt)→CNO-

[0027] The present invention also provides a salt bath nitriding treatment method, which ...

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Abstract

The present invention relates to a salt bath formula and treatment method in the salt bath nitriding treatment of stainless steel air-conditioning compressor blades. The salt bath formula of the present invention is composed of the following components and proportioned by weight percentage: potassium cyanate and cyanic acid 25%-50% of sodium, 8%-25% of sodium carbonate, 10%-30% of potassium carbonate, 20%-40% of sodium chloride or potassium chloride; The process makes the passivation film on the surface of the blade removed by pickling, which is easy to infiltrate nitrogen during salt bath nitriding; because the concentration of Cl (7-17%) is increased in the formula, the melting point in the salt bath is reduced, and the formula does not contain Li And K2S can still be nitrided at lower temperature.

Description

technical field [0001] The invention relates to a salt-bath nitriding treatment for stainless steel air-conditioning compressor blades, in particular to a salt-bath formula and a treatment method used in the treatment. Background technique [0002] In order to improve the wear resistance and noise reduction function of the stainless steel air-conditioning compressor blade (material 11Cr17), it is required that the thickness of the white layer is more than 0.004mm, the mesh structure is greater than 1 level, the thickness of the mesh layer is greater than 0.045mm, and the distance from the R surface is 0.030mm The hardness at the center is greater than Hv900, the hardness at 0.060mm from the R surface is greater than Hv500, and the hardness at the core is greater than Hv360. Salt bath nitriding process is usually used. [0003] Due to the passivation film on the surface of stainless steel and the existence of atoms such as alloy elements Cr, which hinder the infiltration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/50F04D29/24
Inventor 李迪准徐晓翔
Owner SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH
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