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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: 2013-10-30
SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method not only complicates the operation, but also causes some 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 salt bath composition among the present invention is mainly composed 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 as the reaction proceeds The consumed cyanate can be replenished by adding regeneration salt, and the salt bath composition can be recycled.

[0022] CNO - +O 2 →[C]+[N]+CO 3 2-

[0023] CO 3 2- +Z (Regeneration Salt) → CNO -

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

[0025] Put urea, carbonate and other components into a crucible after being fully mixed and melted at a high temperature of 600°C for 2 hours before mass pr...

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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 composition used in the treatment and a treatment method. Background technique [0002] In order to improve the wear resistance and noise reduction function of stainless steel air-conditioning compressor blades (11Cr17), the thickness of the white layer is required to be 0.005mm, the network structure is greater than 1 level, and the total penetration layer is greater than 0.050mm. The surface nitriding process is usually used, including gas nitriding and salt bath nitriding. The former is rarely used due to low work efficiency (the general treatment time is as long as 70 hours and the white layer in the nitrided layer is too thin). [0003] Although conventional salt bath nitriding has improved compared to gas nitriding, due to the existence of passivation film on the surface of stainless steel and the existence...

Claims

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Application Information

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Patent Type & Authority Patents(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