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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AI-Extracted 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...

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.

Technology Topic

ChemistryOxide +13

Examples

Experimental program(1)

Example Embodiment

[0007] The embodiments provided by the present invention are described in further detail:

[0008] The technical scheme of the present invention is: a pretreatment method for iron-based hardware electroplating, including the steps: (a) cleaning and removing oil stains on the surface of iron-based hardware with alkaline solution; (b) cleaning and removing iron-based hardware with acid solution Oxide on the surface of the piece; (c) electrochemical polishing of the hardware; wherein the chemical polishing solution used contains 100-110mL/L hydrogen peroxide, 200-260mL/L acetic acid, 130-320mL /L concentrated nitric acid, 80~90g/L sulfamic acid, 55~105mL/L hydroxyethylidene diphosphonic acid and 20~30g/L sodium lauryl sulfate; lead electrode as cathode, hardware Electrochemical treatment for the anode, the time is 20-40min, the current density is 9-20A/dm2.

[0009] Preferably, the chemical polishing liquid contains 250 mL/L hydrogen peroxide, 250 mL/L acetic acid, 90 mL/L concentrated nitric acid, 90 g/L sulfamic acid, and 50 mL/L hydroxyethylidene diphosphonic acid And 30g/L sodium lauryl sulfate.

PUM

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