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Insulation protection method for copper plated part

A technology for insulation protection and parts, applied in the field of insulation protection of copper-plated parts, can solve the problems of uneven transition zone between the plated surface and the non-plated surface, heating is required for dissolution and removal, and the metal wire cannot be reused, etc., to achieve good Protective effect, high stability, qualified effect of detection structure

Active Publication Date: 2019-02-01
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to manual operation, the transition area between the plated surface and the non-plated surface is uneven, and the plated layer is prone to foaming due to the existence of redundant protection, resulting in rework, and the processing efficiency is low; tapes and wires cannot be reused, and wax dissolution and removal need to be added. temperature

Method used

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  • Insulation protection method for copper plated part
  • Insulation protection method for copper plated part

Examples

Experimental program
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Effect test

Embodiment 1

[0046] An insulation protection method for a chrome-plated copper-plated part of a shaft, comprising the following steps:

[0047] Step 1: Insulation Protection

[0048] According to the shape of the non-copper-plated part 2 of the chrome-plated copper-plated part of the shaft to be processed, a special EPDM rubber 1 protective sleeve is designed, and it is set in the non-copper-plated area of ​​the chrome-plated shaft. The structure diagram is shown in figure 1 ; Special EPDM rubber 1 protection plug is designed, which is set on the non-copper-plated part of the copper-plated part 2 except the teeth. The schematic diagram of its structure is shown in figure 2 , to get copper-plated parts.

[0049] The special EPDM rubber is corrosion-resistant to strong acid, strong alkali, cyanide, and plating solution containing hexavalent chromium, and its volume expansion rate is 0.2%; After the parts are batched, they will be severely deformed, their elasticity will decrease, and they...

Embodiment 2

[0068] A method for insulating and protecting the chrome-plated copper-plated parts of the shaft portion, the same as embodiment 1, the difference is that:

[0069] Step 5: Copper Plating

[0070] Place the pre-nickel-plated copper-plated parts in the plating bath, immerse in the cyanide bath for electroplating, and obtain electroplated copper parts; wherein, the temperature of the plating bath is 55°C, and the current density is 1.5A / dm 2 , the anode material is T 1 , the copper plating bath is a cyanide bath, and the composition and the content of each component included in the cyanide bath are: CuCN is 80g / L, NaCN (free) is 20g / L, NaOH is 15g / L, NaOH is 15g / L, Na 2 CO 3 40g / L, the balance is water;

Embodiment 3

[0072] A method for insulating and protecting the chrome-plated copper-plated parts of the shaft portion, the same as embodiment 1, the difference is that:

[0073] Step 6:

[0074] Place the copper-plated parts after electroplating copper in the passivation tank and immerse in the bath solution containing hexavalent chromium. 2 Cr 2 o 7 2H 2 O is 120g / L, H 2 SO 4 (ρ=1.84g / cm 3 ) is 5g / L, NaCl is 7g / L, and the rest is water. The passivation time is 5s;

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Abstract

The invention relates to an insulation protection method for a copper plated part, and belongs to the technical field of copper plating insulation protection. The method comprises the following stepsthat a non-copper-plated portion of the part to be treated is sleeved with a special ethylene propylene diene monomer, the part to be plated with copper sequentially undergoes oil removal, corrosion,pre-nickel plating, copper electroplating and passivating to obtain the copper plated part, wherein in the copper electroplating process, a copper plating bath solution is a cyaniding plating solution, the cyaniding plating solution specifically comprises the following components of 75-90 g / L of CuCN, 15-25 g / L of free NaCN, 10-20 g / L of NaOH, less than or equal to 70g / L of Na2CO3 and the balancewater, and in the case of process parameters of copper electroplating, the current density is 1.0-2.0 A / dm<2>, and the temperature is 50-60 DEG C. The method is the insulation protection method adopting a protective material resisting to strong acid, strong alkali and high temperature, and designed in combination with the structure of the part, so that a transition area of a plating surface and anon-plating surface are orderly and consistent, moreover, the machining efficiency is high, the consistency of the quality is ensured, the repair rate caused by poor protection is reduced to 0, and the production efficiency is improved by 80% or above.

Description

technical field [0001] The invention relates to the technical field of copper plating insulation protection, in particular to an insulation protection method for copper plating parts. Background technique [0002] The copper plating layer has good anti-adhesion performance, and is widely used in the anti-adhesion of aero-engine parts. For the electroplating requirements of various types of aero-engine components, most of them are partial electroplating, and no coating is allowed on the non-plated surface. For the protection methods of local electroplating parts, waxing, tape wrapping, wire binding and other methods are mostly used at present. Due to manual operation, the transition area between the plated surface and the non-plated surface is uneven, and the plated layer is prone to foaming due to the existence of redundant protection, resulting in rework, and the processing efficiency is low; tapes and wires cannot be reused, and wax dissolution and removal need to be adde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/02C23G1/14C23G1/02C25D3/12C25D3/40C23C22/24C25D7/00
CPCC23C22/24C23G1/02C23G1/14C25D3/12C25D3/40C25D5/022C25D7/00
Inventor 王辉杜兴盛于志达张颖裴丽艳
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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