Method for carrying out cyanide-free cuprous brass electroplating on steel cord and method for passivating brass coating

A cyanide-free cuprous and brass coating technology, which is applied in the field of steel cord surface modification, can solve the problems of unstable coating composition, complex process, poor corrosion resistance, etc., shorten the production process, stabilize the coating composition, and reduce production cost effect

Inactive Publication Date: 2014-10-29
UNIV OF JINAN
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of the existing steel cord cyanide-free electroplating brass process, high cost, unstable coating composition and poor corrosion resistance, and provide steel cord cyanide-free cuprous electroplating brass and brass Passivation method of copper plating

Method used

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  • Method for carrying out cyanide-free cuprous brass electroplating on steel cord and method for passivating brass coating
  • Method for carrying out cyanide-free cuprous brass electroplating on steel cord and method for passivating brass coating

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specific Embodiment approach 1

[0019] Specific embodiment one: the steel cord of the present embodiment is cyanide-free copper-plated brass according to the following steps:

[0020] (1) Preparation of cyanide-free cuprous electroplating brass solution: a. The concentration of cuprous oxide is 3~30g / L, the concentration of antioxidant is 0.2~20.0g / L, and the concentration of cuprous complexing agent is 15 ~150g / L, the concentration of auxiliary complexing agent is 10~100g / L and weighs cuprous oxide, antioxidant, cuprous complexing agent and auxiliary complexing agent respectively; The copper complexing agent and the auxiliary complexing agent are successively dissolved in 60 mL / L of acetic acid solution, heated and stirred until dissolved to obtain solution A; c, the cuprous oxide weighed in step a is added to solution A, stirred until dissolved, After standing for 24 hours, solution B was prepared; d, the concentration of zinc acetate was 5~40g / L, the concentration of sodium acetate was 40~50g / L, and the c...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the antioxidant described in step (1) a and b is uric acid, vitamin C, sodium hypophosphite, hydroquinone, pyrocatechol Or one of resorcinol, the concentration is 0.5~15.0g / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025]Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the cuprous complexing agent described in a and b of step (1) is thiosemicarbazide, tetramethylthiourea, thiourea or One kind of ethylene thiourea or a combination of several of them, the concentration is 18~145g / L. Others are the same as in the first or second embodiment.

[0026] When the cuprous complexing agent of this embodiment is a composition, various cuprous complexing agents are combined in arbitrary ratios.

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Abstract

The invention relates to a method for carrying out cyanide-free cuprous brass electroplating on a steel cord and a method for passivating a brass coating and relates to a method for electroplating brass on the steel cord and a method for passivating the brass coating, aiming at the technical problems of difficult control over coating components, poor bonding force and poor corrosion resistance during the cyanide-free brass electroplating of the steel cord at present. The cyanide-free cuprous brass electroplating of the steel cord comprises the following steps of: preparing a cyanide-free cuprous brass electroplating solution; (2) pretreating the steel cord; (3) carrying out the cyanide-free cuprous brass electroplating on the steel cord. The brass coating with stable components and good bonding force is obtained by carrying out the cyanide-free cuprous brass electroplating on the steel cord. The method for passivating the brass electroplating comprises the following step of soaking the steel cord electroplated with the brass coating into a passivation solution for chemical passivation. The method for carrying out the cyanide-free cuprous brass electroplating on the steel cord and the method for passivating the brass coating can reduce the production cost of the steel cord and can be used for large-scale industrial production of the steel cord.

Description

technical field [0001] The invention belongs to the field of surface modification of steel cords, and relates to an electroplating method for a brass coating on a steel cord and a passivation method for the brass coating. Background technique [0002] The steel cord matrix is ​​made of high-quality high-carbon steel wire, which can be used as the skeleton material of rubber, so that it can form a radial tire with excellent performance with rubber, prolong the service life of the tire, and improve the elasticity and puncture resistance of the tire. Due to the obvious advantages of radial tires over traditional bias tires, steel cords have been widely used as reinforcement materials for radial tires. Therefore, the production of steel cords has become a key technology for the manufacture of new radial tires. [0003] In order to improve the bonding force between the steel cord and rubber, the surface of the steel cord must be electroplated with brass, and the composition contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38
Inventor 田栋周长利夏方诠郑香丽刘姗花小霞
Owner UNIV OF JINAN
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