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Method for removing hydrogen in high strength steel electroplated by zinc-nickel alloy

A technology of high-strength steel and zinc-nickel plating, which is applied in the field of metal protection, can solve problems such as difficult passivation of the coating, limitations of electroplating zinc-nickel alloys, failure to meet protection requirements, etc., and achieve simple process methods, broaden the application range, and reduce production costs. cheap effect

Active Publication Date: 2011-03-30
湖北三江航天红林探控有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, oxidative discoloration easily occurs on the surface of the coating during the high-temperature baking and dehydrogenation operation of the coated zinc-nickel alloy parts, which makes it difficult to passivate the coating, reduces the corrosion resistance, and fails to meet the protection requirements. Alloy applications are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The parts are prepared by high-strength steel with a tensile strength of 1050MPa, and then treated with a zinc-nickel alloy plating process, and then the hydrogen removal operation is carried out according to the following steps:

[0020] 1) Cleaning: Wash the high-strength steel parts after zinc-nickel alloy plating with 45°C water for 1 to 2 minutes, wash off the residual liquid on the surface, and then soak the high-strength steel parts in alcohol for 3 minutes to remove the surface attached organic impurities;

[0021] 2) Dehydrogenation: The cleaned high-strength steel parts are treated with vacuum dehydrogenation. Put the dried parts into the vacuum furnace, seal the furnace door, vacuumize, and the pressure in the vacuum furnace reaches 1×10 -2 Pa, start heating, continue vacuuming, when the pressure reaches 1×10 -3 Pa, start timing when the temperature reaches 210°C, and keep this pressure and temperature for 8 hours;

[0022] 3) Coating activation: place the...

Embodiment 2

[0028] The parts are prepared by high-strength steel with a tensile strength of 1500MPa, and then treated with a zinc-nickel alloy plating process, and then the hydrogen removal operation is carried out according to the following steps:

[0029] 1) Cleaning: Wash the high-strength steel parts after zinc-nickel alloy plating with 10°C water for 2 minutes, wash the residual liquid on the surface, and then soak the high-strength steel parts in alcohol for 4 minutes to remove organic impurities attached to the surface ;

[0030] 2) Dehydrogenation: The cleaned high-strength steel parts are treated with vacuum dehydrogenation. Put the dried parts into the vacuum furnace, seal the furnace door, vacuumize, and the pressure in the vacuum furnace reaches 1×10 -2 Pa, start heating, continue vacuuming, when the pressure reaches 1×10 -4 Pa, start timing when the temperature reaches 220°C, and keep this pressure and temperature for 18 hours;

[0031] 3) Plating layer activation: place t...

Embodiment 3

[0037] The parts are prepared by high-strength steel with a tensile strength of 1850MPa, and then treated with a zinc-nickel alloy plating process, and then the hydrogen removal operation is carried out according to the following steps:

[0038] 1) Cleaning: Wash the high-strength steel parts after zinc-nickel alloy plating with 40°C water for 1 minute, wash the residual liquid on the surface, and then soak the high-strength steel parts in alcohol for 5 minutes to remove organic impurities attached to the surface ;

[0039] 2) Dehydrogenation: The cleaned high-strength steel parts are treated with vacuum dehydrogenation. Put the dried parts into the vacuum furnace, seal the furnace door, vacuumize, and the pressure in the vacuum furnace reaches 1×10 -2 Pa, start heating, continue vacuuming, when the pressure reaches 5×10 -4 Pa, start timing when the temperature reaches 230°C, and keep this pressure and temperature for 24h;

[0040] 3) Coating activation: place the high-streng...

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Abstract

The invention relates to a method for removing hydrogen in high strength steel electroplated by zinc-nickel alloy, including the following steps: 1) zinc nickel alloy coated high strength steel parts are sequentially cleaned by water and soaked by alcohol; 2) parts after being cleaned are placed into a vacuum furnace to be subject to heat treatment, so that hydrogen atom on coating surface is overflown; 3) parts after hydrogen removal are placed into citric acid-boric acid mixed aqueous solution to be activated; 4) parts after coating activation treatment are subject to zinc nickel alloy electroplating again; 5) parts after composite electroplating are placed into chromic anhydride-sodium chloride mixed aqueous solution to be passivated; 6) parts after passivation treatment are cleaned by water and dried by blowing, thus obtaining the finished product conforming to the requirements. The method can be utilized to effectively remove hydrogen penetrated into base metal in electroplated by zinc-nickel alloy process, hydrogen embrittlement is reduced, and passivation coating with good protective properties can be generated on the surface of alloy coating, and meanwhile the technological method of the invention is simple and production cost is low.

Description

technical field [0001] The invention relates to the technical field of metal protection, in particular to a method for removing hydrogen by electroplating a zinc-nickel alloy on high-strength steel. Background technique [0002] Steel parts are easy to rust in the air, so parts need to be protected after processing. Usually, electroplating is used to form a thin protective metal layer on the surface of steel parts, such as zinc layer, cadmium layer, zinc-nickel alloy layer, etc. [0003] In the electroplating process, hydrogen atoms are generated in the degreasing process, pickling process and electroplating process. Hydrogen penetrates into the base steel of the part and causes lattice distortion, which is prone to hydrogen embrittlement fractures and quality failures. Hydrogen atoms have no effect on steel with lower tensile strength (below 1050Mpa), but have a significant effect on steel with tensile strength greater than 1240MPa, and the higher the strength value of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/36C25D5/48C25D3/56
Inventor 熊劲松杨艳芹储广峰
Owner 湖北三江航天红林探控有限公司
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