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Quick zinc sulfate electroplating process

An electroplating process and zinc sulfate technology, applied in the field of galvanizing process, can solve the problems of low production efficiency, long electroplating time and high cost

Inactive Publication Date: 2009-08-26
梁新中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying the chloride galvanizing process, the galvanizing time of the workpiece immersed in the electroplating solution needs 40-60min, the electroplating time is long, the cost is high, and the production efficiency is low, and the surface of the plated parts is prone to blackening after a long storage time

Method used

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Embodiment Construction

[0006] The present invention will be further described below in conjunction with specific embodiments. 1m in volume 3 In the galvanizing tank, the metal workpiece is galvanized according to the process of the present invention. First prepare the electroplating solution according to the proportioning content, add 100kg of zinc sulfate, 150kg of potassium chloride, 25kg of boric acid as buffer, 1.5kg of rare earth element compound as additive, and 20kg of sulfur-zinc-1 No. 1 as brightener. , stir evenly, fully mix and dissolve. The pH of the electroplating solution was 4.5 and the temperature was 30°C. Degrease and decontaminate the metal workpiece, wash it with water, pickle it, and then wash it with water, and then immerse the workpiece in the electroplating solution in the galvanizing tank for rapid galvanizing. The negative pole of the circuit is connected to the workpiece, the positive pole is connected to the anode plate, and the current density is 5A / dm 2 , the cathod...

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Abstract

A quick zinc sulfate electroplating process comprises the following steps: firstly, removing oil on a work piece, washing the workpiece by water, acid and water respectively, then soaking the workpiece into electroplating liquid in a galvanizing bath, taking out the work piece, washing the workpiece by water, then passivating the workpiece, washing the workpiece by water again, and drying the workpiece with hot wind. Content of chemical materials in each liter of the electroplating liquid is as follows: 80 to 150 grams of zinc sulfate, 120 to 180 grams of potassium chloride, 25 to 30 grams of buffer, 1 to 2 grams of additive and 20 to 25 grams of lustre-coating agent. The workpiece is soaked in the electroplating liquid for 10 to 15 minutes at a temperature of between 5 and 60 DEG C, and the pH value of the electroplating liquid is 4 to 5. The technical conditions of soaking the workpiece in the electroplating liquid in order to galvanize are as follows: the current density is 2 to 5A / dm; the cathode motion speed is 15 to 20 times per minute. By using the process to galvanize the workpiece, the deposition velocity is quick; dispersive power is good; corrosion resistance is strong; electroplating time is reduced by 60 percent; processing cost is reduced by 30 percent; production efficiency is high; and economic benefit is good.

Description

technical field [0001] The invention relates to electroplating technology, in particular to galvanizing technology. Background technique [0002] Galvanizing on the surface of metal workpieces is a commonly used technical means to prevent corrosion, which plays an important role in improving the appearance quality of workpieces. The traditional commonly used galvanizing process is chloride galvanizing process. Generally, each liter of electroplating solution contains 240g potassium chloride, 50g zinc chloride, 30g boric acid, and 20ml brightener. The pH value of the electroplating solution is 5.8 and the current density is 2A. / dm 2 . During electroplating, the workpiece is first degreasing, washed with water, pickled, and then immersed in the plating solution of the plating tank to galvanize, then washed with water, passivated, washed with water, and dried. Using the chloride galvanizing process, the galvanizing time for the workpiece to be immersed in the electroplating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D5/00
Inventor 梁新中
Owner 梁新中
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