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Preparation method for low-hydrogen fragile zinc-nickel alloy electroplated layer

A technology of zinc-nickel alloy and electroplating layer, which is applied in the field of preparation of zinc-nickel alloy electroplating layer with low hydrogen embrittlement, can solve problems such as not considering the hydrogen embrittlement performance of the zinc-nickel alloy layer, easy fracture of the zinc-nickel alloy layer, and affecting protection performance. Achieve low production cost, excellent protection performance, and reduce hydrogen permeation

Inactive Publication Date: 2014-05-21
WUXI SANZHOU COLD ROLLED SILICON STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above method does not consider the influence of hydrogen permeation on the substrate and the hydrogen embrittlement performance of the electroplated zinc-nickel alloy layer itself when electroplating the zinc-nickel alloy layer.
The hydrogen embrittlement performance of the zinc-nickel alloy layer itself is too low, which may easily cause the zinc-nickel alloy layer to break when it is stretched, affecting its protective performance, and the electroplating zinc-nickel alloy will affect the performance of the substrate due to the hydrogen permeation of the substrate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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:

[0025] 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;

[0026] 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;

[0027] 3) Coating activation: place the...

Embodiment 2

[0033] 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:

[0034] 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 ;

[0035] 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;

[0036] 3) Plating layer activation: place t...

Embodiment 3

[0042] 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:

[0043] 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 ;

[0044] 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;

[0045] 3) Coating activation: place the high-stre...

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Abstract

The invention relates to a preparation method for a low-hydrogen fragile zinc-nickel alloy electroplated layer. The preparation method is characterized in that a process for an electroplated zinc-nickel alloy coating is as follows: 70-80g / L of ZnCl2, 100-120g / L of NiCl2.6H2O, 30-40g / L of KCl, 190-210g / L of NH4Cl, 20-30g / L of H3BO3, 0.5-1g / L of 2-mercapto benzimidazole cyclohexylamine salt, 0.5-1g / L of benzimidazole, 0.5-1g / L of citric acid and 0.5-1g / L of oxalic acid. The current density is 1.5A / dm<2>-2.7A / dm<2>; the temperature is 30-40 DEG C; the pH (Potential of Hydrogen) value is 5-6.5. According to the method, seepage hydrogen of high-strength in the electroplating process can be effectively reduced, and the obtained zinc-nickel electroplated layer has low hydrogen fragility and a good protection performance.

Description

technical field [0001] The invention relates to the technical field of metal protection, in particular to a method for preparing a zinc-nickel alloy electroplating layer with low hydrogen embrittlement. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 刘茂见
Owner WUXI SANZHOU COLD ROLLED SILICON STEEL
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