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Pretreatment method for iron-based hardware electroplating

A hardware and iron-based technology, applied in the field of pre-treatment of iron-based hardware electroplating, can solve problems such as poor corrosion resistance, and achieve the effect of uniform and beautiful coating and high anti-corrosion performance.

Inactive Publication Date: 2014-01-01
昆山纯柏精密五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The pretreatment method of iron-based hardware electroplating provided in this embodiment comprises steps:

[0021] (a) Use an alkaline solution to clean and remove oil stains on the surface of iron-based hardware; wherein, the alkaline solution is a sodium hydroxide solution with a concentration of 15% to 25%, and the cleaning time is 10 to 50 minutes; after the alkali cleaning is completed, use Washing the hardware with water and drying;

[0022] (b) Use an acidic solution to clean and remove oxides on the surface of the iron-based hardware; wherein, the acidic solution is a phosphoric acid solution with a concentration of 10% to 20%, and the cleaning time is 2 to 5 minutes; hardware and dry

[0023] (c) Prepare chemical polishing solution, which contains 140mL / L hydrogen peroxide, 120mL / L acetic acid, 60mL / L concentrated nitric acid, 30g / L sulfamic acid, 10mL / L hydroxyethyl Forked bisphosphonic acid and 10g / L sodium lauryl sulfate; the lead electrode is used as the...

Embodiment 2

[0026] The pretreatment method of iron-based hardware electroplating provided in this embodiment comprises steps:

[0027] (a) Use an alkaline solution to clean and remove oil stains on the surface of iron-based hardware; wherein, the alkaline solution is a sodium hydroxide solution with a concentration of 15% to 25%, and the cleaning time is 10 to 50 minutes; after the alkali cleaning is completed, use Washing the hardware with water and drying;

[0028] (b) Use an acidic solution to clean and remove oxides on the surface of the iron-based hardware; wherein, the acidic solution is a phosphoric acid solution with a concentration of 10% to 20%, and the cleaning time is 2 to 5 minutes; hardware and dry

[0029] (c) Prepare chemical polishing solution, which contains 160mL / L hydrogen peroxide, 160mL / L acetic acid, 80mL / L concentrated nitric acid, 50g / L sulfamic acid, 20mL / L hydroxyethyl Forked diphosphonic acid and sodium lauryl sulfate of 10g / L; with the lead electrode as the ...

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Abstract

The invention discloses a pretreatment method for iron-based hardware electroplating. The method is characterized by comprising the steps of: firstly using an alkaline solution and an acidic solution to clean iron-based hardware; then subjecting the hardware to electrochemical polishing treatment, with an employed chemical polishing solution containing 140-160mL / L hydrogen peroxide, 120-160mL / L acetic acid, 60-80mL / L concentrated nitric acid, 30-50g / L aminosulfonic acid, 10-20mL / L hydroxyethylidene diphosphonic acid and 6-10g / L sodium dodecyl sulfate; adopting a lead electrode as a cathode and the hardware as an anode to perform electrochemical treatment for 20-40min, and keeping the electric current density at 5-8A / dm<2>. The pretreatment method for iron-based hardware electroplating provided by the invention can make the hardware acquire a plating layer with excellent bonding properties in the follow-up electroplating process, and the plating layer is uniform and beautiful, and has high anti-corrosion performance.

Description

technical field [0001] The invention relates to the technical field of surface treatment of hardware, in particular to a pretreatment method for electroplating of 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. [0003] Improving the corrosion resistance of iron-based materials mainly starts fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/36C25F3/24
Inventor 黄海胜
Owner 昆山纯柏精密五金有限公司
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