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Steel core acid cuprous stannous electroplating ladder imitation gold bronze

A technology of tin electroplating and steel core, which is applied in the field of surface treatment of acidic cuprous stannous electroplating stepwise imitation gold bronze, which can solve the problems of poor bonding force, poor electrochemical protection of the coating, easy peeling and peeling of the coating, etc., to achieve improved bonding Good strength and bonding force, solve the effect that the coating is easy to peel off

Inactive Publication Date: 2018-10-02
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of easy peeling and peeling of the plating layer after stamping and poor electrochemical protection of the plating layer due to poor bonding force of the current steel core non-cyanide electroplating imitation gold bronze plating layer, and provides a method of acidic cuprous Method for tin electroplating step imitation gold bronze

Method used

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  • Steel core acid cuprous stannous electroplating ladder imitation gold bronze
  • Steel core acid cuprous stannous electroplating ladder imitation gold bronze
  • Steel core acid cuprous stannous electroplating ladder imitation gold bronze

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specific Embodiment approach 1

[0018] Specific embodiment one: the steel core acidic cuprous stannous electroplating step imitation gold bronze of the present embodiment is carried out according to the following steps:

[0019] (1) Preparation of acidic cuprous stannous electroplating imitation gold bronze solution: a. Dissolve 5~60 mL of hydrochloric acid in 200 mL of deionized water, slowly add 0.5~6 g of hydroquinone, and then add 10~35 g stannous complexing agent, heat and stir until completely dissolved, then add 5~12 g stannous chloride, stir until completely dissolved, then age for 24 h to obtain solution A; b. measure 5~50 mL hydrochloric acid and dissolve in 600 mL Slowly add 0.2-3 g of hydroquinone to deionized water, then add 20-100 g of cuprous complexing agent, heat and stir until completely dissolved, then add 0.2-10 g of cuprous chloride, stir until completely dissolved, then age Solution B was prepared after 36 h; c. Mix solutions A and B, and dilute to 1 L to obtain an acidic cuprous tin-ti...

specific Embodiment approach 2

[0024] Specific embodiment two: what this embodiment is different from specific embodiment one is that the stannous complexing agent described in a of step (1) is one or two of them in tartaric acid, citric acid, gluconic acid or malic acid The combination, the concentration is 12~30g / L. Others are the same as in the first embodiment.

[0025] When the stannous complexing agent of this embodiment is a composition, two kinds of stannous complexing agents are combined in arbitrary ratios.

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the cuprous complexing agent described in b of step (1) is one of potassium chloride, thiourea or ethylene thiourea or wherein The combination of the two, the concentration is 25~90 g / L. Others are the same as in the first or second embodiment.

[0027] When the cuprous complexing agent of this embodiment is a composition, two kinds of cuprous complexing agents are combined in arbitrary ratios.

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Abstract

Steel core acidic cuprous stannous electroplating step imitation gold bronze, the invention relates to a method for electroplating stepwise imitation gold bronze on the surface of a steel core by using an acidic cuprous stannous electroplating solution. The invention aims to solve the problems of easy peeling and peeling of the plating layer after stamping and poor electrochemical protection of the plating layer due to poor binding force of the current steel core-free electroplating imitation gold bronze plating layer. Steel core acid cuprous stannous electroplating step gradient imitation gold bronze: (1) preparation of acid cuprous stannous electroplating imitation gold bronze solution; (2) steel core pretreatment; (3) steel core electroplating step imitation gold bronze; ( 4) Electromagnetic induction heat treatment after plating. After the steel core is electroplated in an acidic cuprous stannous electroplating solution, the tin content of the coating increases step by step from the inside to the outside. The inner coating can form electrochemical protection for the surface coating, protect the appearance and prolong the life. After heat treatment, the pre-tin coating interpenetrates with the substrate and the imitation gold bronze coating to further improve the bonding force of the coating.

Description

technical field [0001] The invention belongs to the field of surface treatment of steel cores, and relates to a surface treatment method for acidic cuprous tin-tin electroplating stepwise imitation gold bronze on steel cores. Background technique [0002] As the relative prices of metals such as copper and nickel continue to increase, the manufacturing process of coins has also changed to achieve a relative balance between coin manufacturing costs and their currency prices. The material of the one-dollar coin has gradually evolved from the original copper-nickel alloy (namely white copper) to nickel-plated steel core, while the material of the five-cent coin has gradually evolved from the initial copper-zinc alloy (ie brass) to electroplated copper alloy on the steel core. The color of copper-tin alloys (i.e. bronze) changes dramatically with decreasing tin content in the alloy. When the tin content is high, it is often called cupronickel tin. The alloy is silvery white and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/58C25D5/36C25D5/50C25D5/10
CPCC25D3/58C25D5/10C25D5/36C25D5/50
Inventor 田栋陈博文侯恩啸黄太仲夏方诠周长利
Owner UNIV OF JINAN