Hard oxidation method for aluminum alloy of rotary compression disc of air conditioning compressor

An air-conditioning compressor, rotary compression technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of corrosion and dissolution, the existence of oxide film, and the inability of current density and heat to remove the oxide film in time

Active Publication Date: 2017-09-22
江苏昊科汽车空调有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hardening treatment usually adopts anodic oxidation hardening treatment, while traditional aluminum alloy oxidation treatment mostly adopts sulfuric acid and oxalic acid system, and may use electrolytic oxidation of pulse power supply line to form oxide film. Corrosion and dissolution occur. When the oxidation rate and corrosion rate reach a balance, the thickness of the oxide film will not continue to grow, and as the electrolysis time prolongs, the wear resistance of the oxide film will decrease instead.
At the same time, during the formation of the oxide film, burning is also prone to occur. Generally, due to the excessive current densi

Method used

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  • Hard oxidation method for aluminum alloy of rotary compression disc of air conditioning compressor
  • Hard oxidation method for aluminum alloy of rotary compression disc of air conditioning compressor
  • Hard oxidation method for aluminum alloy of rotary compression disc of air conditioning compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of anodic oxidation electrolyte: first add about 70% pure water to the electrolytic cell, then add 150g / L concentrated sulfuric acid, add the remaining pure water to the scale line and stir evenly to obtain a sulfuric acid aqueous solution with a temperature of about 60°C , take out part of the sulfuric acid solution for additive preparation, and continue to add 15g / L oxalic acid to the rest and stir to dissolve. Take 1000ml sulfuric acid aqueous solution, put 40g sodium molybdate, 20g sodium phosphate and 20g sodium tellurate quickly at about 60°C and stir to dissolve to obtain additive solution. In the mixed solution of sulfuric acid and oxalic acid, add the additive solution of 20~50ml / L, preferably 25ml / L, and stir evenly.

[0019] The electrolytic tank is equipped with an overflow tank and a cooling pipe, and the bottom of the tank is equipped with an air pipe. During electrolysis, the water pump is turned on to overflow the electrolyte and the heat gen...

Embodiment 2

[0022] In this embodiment, the preparation of the electrolytic solution for anodic oxidation: first add about 70% pure water in the electrolytic cell, then add 180g / L concentrated sulfuric acid, supplement the remaining pure water to the scale line and stir to obtain the sulfuric acid aqueous solution The temperature is about 60°C, take out part of the sulfuric acid solution for additive preparation, and continue to add 20g / L oxalic acid to the rest and stir to dissolve. Take 1000ml of sulfuric acid aqueous solution, quickly add 40g of sodium molybdate, 20g of sodium phosphate and 20g of sodium tellurate at about 60°C and stir to dissolve to obtain an additive solution. In the mixed solution of sulfuric acid and oxalic acid, add 20-50ml / L additive solution, preferably 25ml / L, and stir evenly.

[0023] The electrolytic tank is equipped with an overflow tank and a cooling pipe, and the bottom of the tank is equipped with an air pipe. During electrolysis, the water pump is turned...

Embodiment 3

[0026] In the present embodiment, the preparation of the electrolytic solution of anodic oxidation: first add about 70% pure water in the electrolytic cell, then add the concentrated sulfuric acid of 150g / L, replenish the remaining pure water to the scale line and stir the obtained sulfuric acid aqueous solution The temperature is about 60°C, take out part of the sulfuric acid solution for additive preparation, and continue to add 20g / L oxalic acid to the rest and stir to dissolve. Take 1000ml of sulfuric acid aqueous solution, quickly add 40g of sodium molybdate, 20g of sodium phosphate and 20g of sodium tellurate at about 60°C and stir to dissolve to obtain an additive solution. In the mixed solution of sulfuric acid and oxalic acid, add 20-50ml / L additive solution, preferably 25ml / L, and stir evenly.

[0027] The electrolytic tank is equipped with an overflow tank and a cooling pipe, and the bottom of the tank is equipped with an air pipe. During electrolysis, the water pum...

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Abstract

The invention discloses a hard oxidation method for an aluminum alloy of a rotary compression disc of an air conditioning compressor. The method comprises the steps that pretreatment is carried out, specifically, the aluminum alloy is sequentially subjected to oil removing, water washing, alkali etching, water washing, bright dipping and water washing pretreatment; anodic oxidation is carried out, specifically, the pretreated aluminum alloy serves as an anode, a lead plate serves as a cathode, anodic oxidation is carried out in an electrolyte, and a power supply is powered on by adopting a direct-current pulse superposition mode, wherein the electrolyte for anode oxidation is composed of 100-200g/L of sulfuric acid, 10-30g/L of organic acid and 0.5-10g/L of an additive A, the temperature is 0-25 DEG C, the voltage is 0-30V, the current density is 1-3.5A/dm2, and the additive A is a mixture of molybdate, phosphate and tellurite which are mixed according to the mass ratio of 2-3:1:1; and an aluminum alloy workpiece subjected to anodic oxidation is soaked and sealed through a hole sealing agent. The method has the advantages that an aluminum alloy hard oxidation film has higher thickness and hardness, and the phenomenon of burning loss of an oxide layer can be avoided.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to the preparation of an aluminum alloy hard anodized antifriction layer. Background technique [0002] Aluminum alloy is widely used in mechanical manufacturing and processing due to its light weight, high strength, easy forming and processing, and low cost. Especially in the field of air-conditioning compressor parts, it has been widely used. In the air-conditioning compressor, the rotating compression disc and the fixed disc perform high-speed rotating friction. It is necessary to harden the rotating compression disc made of aluminum alloy to improve wear resistance. Hardening treatment usually adopts anodic oxidation hardening treatment, while traditional aluminum alloy oxidation treatment mostly adopts sulfuric acid and oxalic acid system, and may use electrolytic oxidation of pulse power supply line to form oxide film. When corrosion and dissolut...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/10C25D11/18
CPCC25D11/024C25D11/08C25D11/10C25D11/18
Inventor 曹靖
Owner 江苏昊科汽车空调有限公司
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