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Low-stress nickel plating technology

A technology of nickel plating and process, which is applied in the field of protective treatment of low-alloy high-strength steel parts, can solve problems such as fracture, and achieve the effects of simple process operation, uniform appearance, and low environmental pollution

Inactive Publication Date: 2011-07-20
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional nickel plating process, the hydrogen embrittlement test will break within 2 hours or even less

Method used

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  • Low-stress nickel plating technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Use a ￠0.8 steel wire to fold into a ￠75 circle, and dip it in the plating solution to check that the transparent film 30S of the bath is not broken. Put the CF6-80E engine front fan coupling nut at 246°C for 190 minutes to remove stress.

[0046] Anodic degreasing is performed on the stress-relieved parts in the degreasing tank, and the current density is 3.5A / dm 2 , electrolysis time 2min, temperature 60°C, check the water film on the surface of the plated parts for 20S continuous. Afterwards, put the degreased parts in a corrosion solution of 160ml / l hydrochloric acid and 1.5g / l rhodin for 0.6min.

[0047] The pre-treated parts are pre-plated with nickel in a pre-nickel bath, and the parts are placed in NiCl at 24°C (room temperature) 2 .6H 2 O 246.3g / l, HCl 190.7g / l pre-plating nickel solution for 3 minutes, then electroplating for 4 minutes, the current density is 6.5A / dm 2 , the part area (including fixture area) is 5dm 2 .

[0048] The pre-plated parts are ...

Embodiment 2

[0051] Use a ￠0.8 steel wire to fold into a ￠75 circle, and dip it in the plating solution to check that the transparent film 20S of the bath solution is not broken. Put the CF6-80E engine front fan coupling nut at 246°C for 180min to remove the stress.

[0052] Anodic degreasing of stress-relieved parts in the degreasing tank with a current density of 4A / dm 2 , electrolysis time 2min, temperature 60°C, check the water film on the surface of the plated material for 20S continuous. Afterwards, put the degreased parts in a corrosion solution of 190ml / l hydrochloric acid and 1.0g / l rhodin for 0.8min.

[0053] Use a pre-nickel-plating tank to pre-nickel the pre-treated parts, and place the parts in NiCl at 24°C (room temperature) 2 .6H 2 O 242.9g / l, HCl 190.1g / l pre-plating nickel solution for 3.5min, then electroplating for 4.5min, the current density is 6A / dm 2 , the part area (including fixture area) is 5dm 2 .

[0054] The pre-plated parts are nickel-plated in the nickel...

Embodiment 3

[0057] Use a ￠0.8 steel wire to fold into a ￠75 circle, and dip it in the plating solution to check that the transparent film 20S of the bath solution is not broken. Put the CF6-80E engine front fan coupling nut at 246°C for 180min to remove the stress.

[0058] Anodic degreasing of stress-relieved parts in the degreasing tank with a current density of 4A / dm 2 , electrolysis time 2min, temperature 60°C, check the water film on the surface of the plated material for 20S continuous. Afterwards, put the degreased parts in a corrosion solution of 160ml / l hydrochloric acid and 1.8g / l rhodin for 0.6min.

[0059] Use a pre-nickel-plating tank to pre-nickel the pre-treated parts, and place the parts in NiCl at 24°C (room temperature) 2 .6H 2 In the pre-plating nickel solution of O 242.3g / l and HCl 194.9g / l for 3 minutes, then electroplating for 4 minutes, the current density is 6.5A / dm 2 , the part area (including fixture area) is 5dm 2 .

[0060] The pre-plated parts are nickel...

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Abstract

The invention provides a low-stress nickel plating technology which takes nickel salt as main salt and obtains a protective layer with low internal stress, high hardness, strong binding force and very superior ductility by checking a plating solution, removing the stress of a material to be plated, anode electrolytic oil removing, etching, nickel preplating, nickel plating and heat treatment. Thetechnology is simple to operate and easy to maintain, has high work efficiency, less pollution to environment and simple sewage treatment, can be widely applied in the protective treatment of low alloy and high strength steel parts of aviation engines, and can be popularized and applied to the protective aspects of the low alloy and high strength steel parts of aviation and aerospace engines, civilian use products and the like and other parts.

Description

technical field [0001] The invention belongs to the technical field of technical corrosion and protection, and in particular relates to a protection treatment method for low-alloy high-strength steel parts. Background technique [0002] Low-alloy steel belongs to the high-quality steel series, which is added trace amounts of various alloy elements to ordinary steel. [0003] The low-alloy high-strength steel parts used in the aviation industry need to be protected, and according to the different working environments, the requirements for the performance of the protective layer are also different. To provide certain oxidation and corrosion resistance to low-alloy high-strength steel parts operating at moderately high temperatures, low tensile stress in the coating is required to avoid a significant reduction in fatigue strength. As a fastener, a low-stress protective layer is required. At the same time, the whole process of pretreatment and electroplating of parts must also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/00C25D5/14C25D5/34C25D3/12
Inventor 王辉张春刚孙士江刘莉
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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