Low-stress nickel plating technology

A low-stress, nickel-plating technology, applied in the field of technical corrosion and protection, can solve problems such as fracture, and achieve the effect of simple technical process, high hardness and good effect

Inactive Publication Date: 2010-05-12
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 ￠0.8 steel wire to fold a circle of ￠75, dip it in the plating solution to check that the transparent film 30S does not break. Place the CF6-80E engine front fan coupling nut at 246°C for 190 minutes to remove stress.

[0046] Degrease the de-stressed parts in the degreasing tank with an anode current density of 3.5A / dm 2 , The electrolysis time is 2min, the temperature is 60℃, and the water film on the surface of the plated parts is checked for 20S continuous. After that, the degreasing parts were corroded in a corrosion solution of 160ml / l hydrochloric acid and 1.5g / l of rhodin for 0.6min.

[0047] Use a pre-nickel bath to pre-nickel the pre-treated parts, and place the parts 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 nickel-plated in the nickel platin...

Embodiment 2

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

[0052] In the degreasing tank, the degreasing of the parts after the stress is carried out, the current density is 4A / dm 2 , The electrolysis time is 2min, the temperature is 60℃, and the water film on the surface of the plated material is checked for 20S continuous. After that, the degreasing parts are placed in a corrosion solution of 190ml / l hydrochloric acid and 1.0g / l for 0.8min.

[0053] Use a pre-nickel bath 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, afterwards 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...

Embodiment 3

[0058] Use ￠0.8 steel wire to fold a circle of ￠75, dip it in the plating solution to check that the transparent film of the bath is not broken for 20S. Place the CF6-80E engine front fan coupling nut at 246°C for 180 minutes to remove stress.

[0059] In the degreasing tank, the degreasing of the parts after the stress is carried out, the current density is 4A / dm 2 , The electrolysis time is 2min, the temperature is 60℃, and the water film on the surface of the plated material is checked for 20S continuous. Afterwards, the degreasing parts were corroded in a corrosion solution of 160ml / l hydrochloric acid and 1.8g / l of Ruotin for 0.6min.

[0060] Use a pre-nickel bath to pre-nickel the pre-treated parts, and place the parts in NiCl at 24°C (room temperature) 2 .6H 2 O 242.3g / l, HCl 194.9g / 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 .

[0061] The pre-plated parts a...

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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. The technology 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 particularly 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. It is made by adding a small amount of various alloying elements to ordinary steel. [0003] The low-alloy high-strength steel parts used in the aviation industry need to be protected, and the requirements for the performance of the protective layer are different depending on the working environment. Provide a certain degree of oxidation and corrosion resistance for low-alloy high-strength steel parts that work at moderate high temperatures, and require low tensile stress in the coating to avoid significant reduction in fatigue strength. As a fastener, a low-stress protective layer is required. At the same time, the entire process of pretreatment and electroplating of parts must also control ...

Claims

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Application Information

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Patent Type & Authority Applications(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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