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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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
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