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Pre-treatment method for electroplating iron-based hardware

A hardware and iron-based technology, which is applied in the field of pretreatment of iron-based hardware electroplating, can solve the problems of poor corrosion resistance, etc., and achieve the effect of uniform and beautiful coating, high anti-corrosion performance and excellent bonding performance

Inactive Publication Date: 2015-05-20
LIUZHOU CITY TONGJIN AUTOMOBILE PARTS MFG CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

Iron-based materials are relatively cheap and easy to process, so iron-based materials are widely used in the manufacture of hardware, but the corrosion resistance of iron-based materials is relatively poor, and generally undergo surface treatment processes to prevent the subsequent processing of hardware Oxidation and corrosion during use

Method used

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Embodiment Construction

[0007] The embodiment provided by the present invention is described in further detail:

[0008] The technical solution of the present invention is: a pretreatment method for electroplating iron-based hardware, comprising the steps of: (a) cleaning with an alkaline solution to remove oil stains on the surface of the iron-based hardware; (b) cleaning with an acidic solution to remove the iron-based hardware oxides on the surface of the hardware; (c) perform electrochemical polishing on the hardware; wherein, the chemical polishing solution used contains 100-110mL / L hydrogen peroxide, 200-260mL / L acetic acid, 130-320mL / L of concentrated nitric acid, 80-90g / L of sulfamic acid, 55-105mL / L of hydroxyethylidene diphosphonic acid and 20-30g / L of sodium dodecyl sulfate; lead electrodes are used as cathodes, hardware Perform electrochemical treatment for the anode, the time is 20-40min, and the current density is 9-20A / dm2.

[0009] Preferably, the chemical polishing solution contain...

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Abstract

The invention discloses a pre-treatment method for electroplating iron-based hardware. The method comprises the following steps: (a) cleaning and removing oil stains on the surface of the iron-based hardware by using an alkaline solution; (b) cleaning and removing oxides on the surface of the iron-based hardware by using an acidic solution; and (c) electrochemically polishing the hardware, wherein a chemical polishing liquid contains 100-110mL / L hydrogen peroxide, 200-260mL / L acetic acid, 130-320mL / L concentrated nitric acid, 80-90mL / L sulfamic acid, 55-105mL / L hydroxyethane diphosphonic acid and 20-30g / L lauryl sodium sulfate, andby taking a lead electrode as a negative pole and the hardware as a positive pole, electrochemical treatment is carried out for 20-40 minutes, and the current density is 9-20A / dm<2>. According to the pre-treatment method for electroplating the iron-based hardware disclosed by the invention, the hardware is electrochemically polished to remove a passivation layer formed in the previous step, and the process can obtain a plating layer of the hardware with an excellent combining performance in a subsequent electroplating process.

Description

technical field [0001] The invention relates to a pretreatment method for electroplating iron-based hardware. Background technique [0002] Hardware parts refer to various metal devices made of iron, steel, aluminum and other metals through forging, rolling, cutting, etc. physical processing, such as hardware tools, hardware parts, daily hardware, construction hardware and security supplies, etc. Hardware is widely used in the production and manufacturing of all walks of life. Iron-based materials are relatively cheap and easy to process, so iron-based materials are widely used in the manufacture of hardware, but the corrosion resistance of iron-based materials is relatively poor, and generally undergo surface treatment processes to prevent subsequent processing of hardware. Oxidation and corrosion occur during use. Contents of the invention [0003] In order to solve the problems in the prior art, the invention provides a pretreatment method for electroplating iron-base...

Claims

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Application Information

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IPC IPC(8): C25D5/36
CPCC25D5/36
Inventor 马深同
Owner LIUZHOU CITY TONGJIN AUTOMOBILE PARTS MFG CO LTD
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