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Salt bath formula for treating stainless air conditioning compressor blade by salt bath nitriding treatment and treatment method

An air-conditioning compressor, salt bath nitriding technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of no obvious improvement in the penetration rate of stainless steel, complicated operation, environmental pollution, etc. , to achieve good appearance and penetration layer thickness, good activity effect

Active Publication Date: 2010-10-27
SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only complicates the operation, but also causes certain pollution to the environment (ammonia gas escapes into the air).
From the actual effect, there is no obvious improvement on the penetration rate of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Potassium cyanate (KCNO) 18%, sodium cyanate (NaCNO) 22%, lithium carbonate (Li 2 CO 3 ) 5%, sodium carbonate (Na 2 CO 3 ) 20%, potassium carbonate (K 2 CO 3 ) 21%, sodium hydroxide (NaOH) 1%, potassium hydroxide (KOH) 3%, sodium chloride (NaCl) 10%.

Embodiment 2

[0020] Potassium cyanate (KCNO) 18%, sodium cyanate (NaCNO) 22%, lithium carbonate (Li 2 CO 3 ) 5%, sodium carbonate (Na 2 CO 3 ) 20%, potassium carbonate (K 2 CO 3 ) 28%, sodium hydroxide (NaOH) 1%, potassium hydroxide (KOH) 3%, sodium chloride (NaCl) 3%.

[0021] The components of salt bath nitriding in the present invention are mainly composed of cyanate and carbonate, and the reaction mechanism is that cyanate reacts with oxygen to generate nitrogen and carbonate, wherein nitrogen atoms penetrate into the matrix, and with the progress of the reaction The consumed cyanate can be replenished by adding regeneration salt, which can be recycled.

[0022] CNO - +O 2 →[C]+[N]+CO 3 2-

[0023] CO 3 2- +Z (regenerated salt)→CNO -

[0024] The preparation method of the present invention is as follows:

[0025] The urea, carbonate and other components are fully mixed and put into the crucible. After being melted at a high temperature of 600°C, the batch production can ...

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Abstract

The invention relates to a salt bath formula for treating a stainless air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 5-20 percent of potassium cyanate, 15-25 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-25 percent of sodium carbonate, 10-30 percent of potassium carbonate, 1-3 percent of sodium hydroxide, 1-5 percent of potassium hydroxide and 1-15 percent of sodium chloride or sodium fluoride. The invention has the advantages that because Li ions and Cl ions are added in the formula, a melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and air cooling can be adopted after salt bath nitridation without adopting the traditional oil cooling mode.

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 conditioner compressor blade (material is 11Crl7), the thickness of the white bright layer is required to be 0.005mm, the reticular structure is greater than grade 1, and the total permeation layer is greater than 0.050mm. Surface nitriding processes are usually used, including gas nitriding and salt bath nitriding, the former is rarely used due to low working efficiency (generally, the treatment time is as long as 70 hours, and the white bright layer in the nitrided layer is too thin). [0003] Although conventional salt bath nitriding is improved compared to gas nitriding, the presence of passivation film on the surface of stainless s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/50C23C8/02C23C8/80
Inventor 李迪准徐晓翔黄宁彭德银
Owner SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH
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