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Method for galvanizing workpiece surface for anticorrosion

A workpiece surface and workpiece technology, which is applied in the field of anti-corrosion galvanizing on the surface of workpieces, can solve the problems that the actual application requirements cannot be fully met, and the corrosion resistance performance is far from the same, so as to increase the aesthetics, improve the anti-corrosion effect, and protect the galvanized layer. Effect

Inactive Publication Date: 2010-01-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, various experimental results show that the zinc plate treated by this method is far from the zinc coating obtained by passivation with chromium-containing passivation solution in terms of corrosion resistance, and cannot fully meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The surface of the workpiece is chemically degreased, activated, rinsed with deionized water, etc., and then treated as follows:

[0023] Step 1, preparing the first layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0024] ZnO 15g, NaOH 140g, NZ-98 3ml, NZ regulator 0.1ml, the balance is water; electroplating, the parameters of electroplating are: current density 0.5A / dm 2 ;Electroplating time 10min;Electroplating tank temperature 10℃;

[0025] After that, a bright and dense galvanized layer will be formed on the surface of the workpiece;

[0026] Step 2, preparing the second layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0027] ZnO 15g, NaOH 140g, NZ-98 1.5ml, NZ regulator 0.1ml, the balance is water; electroplating, the parameters of electroplating are: current density 0.5A / dm 2 ;Electroplating time 5min;Electroplating tank temperature 10℃;

[0028] After that, a thin layer of...

Embodiment 2

[0033] The surface of the workpiece is chemically degreased, activated, rinsed with deionized water, etc., and then treated as follows:

[0034] Step 1, preparing the first layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0035] ZnO 15g, NaOH 140g, NZ-98 5ml, NZ regulator 4ml, the balance is water; electroplating, the parameters of electroplating are: current density 1A / dm 2 ;Electroplating time 35min;Electroplating tank temperature 20℃;

[0036] After that, a bright and dense galvanized layer will be formed on the surface of the workpiece;

[0037] Step 2, preparing the second layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0038] ZnO 15g, NaOH 140g, NZ-98 2ml, NZ regulator 4ml, the balance is water; electroplating, the parameters of electroplating are: current density 1A / dm 2 ;Electroplating time 10min;Electroplating tank temperature 20℃;

[0039] After that, a thin layer of loose ga...

Embodiment 3

[0044] The surface of the workpiece is chemically degreased, activated, rinsed with deionized water, etc., and then treated as follows:

[0045] Step 1, preparing the first layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0046] ZnO 15g, NaOH 140g, XC-510 10ml, XC-520 regulator 20ml, the balance is water; conduct electroplating, the parameters of electroplating are: current density 2A / dm 2 ;Electroplating time 60min;Electroplating tank temperature 40℃;

[0047] After that, a bright and dense galvanized layer will be formed on the surface of the workpiece;

[0048] Step 2, preparing the second layer of galvanizing solution, the components and contents of 1L galvanizing solution are:

[0049] ZnO 15g, NaOH 140g, XC-510 2.5ml, XC-520 regulator 20ml, the balance is water; electroplating, the parameters of electroplating are: current density 2A / dm2 ;Electroplating time 20min;Electroplating tank temperature 40℃;

[0050] After that, a t...

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Abstract

The invention relates to a method for galvanizing a workpiece surface for anticorrosion in the technical field of galvanization, which comprises the following steps: 1. preparing a first layer of galvanizing liquid, 1L of galvanizing liquid comprises the following components: 15 g of ZnO, 140 g of NaOH, 3-10 ml of brightening agent, 0.1-20 ml of adjusting agent and the balance of water; and electroplating a workpiece; 2. preparing a second layer of galvanizing liquid, 1L of galvanizing liquid comprises the following components: 15 g of ZnO, 140 g of NaOH, 1.5-2.5 ml of brightening agent, 0.1-20 ml of adjusting agent and the balance of water; and electroplating the workpiece obtained in the step 1; 3. carrying out lead-free electrophoretic painting on the workpiece and baking the workpiece. The workpiece surface processed by the method is more anticorrosive, a painting layer at the outermost layer is well combined with a galvanizing layer, and the workpiece surface can not generate a separating phenomenon with the galvanizing layer by a neutral salt spray test for more than 1,000 hours and tests of water washing, high and low temperature, and the like, thereby realizing a better protective effect on the galvanizing layer.

Description

technical field [0001] The invention relates to a method in the technical field of surface treatment, in particular to a method for anti-corrosion galvanizing on the surface of a workpiece. Background technique [0002] The galvanizing and electroplating process currently used in the industry is mainly used for anti-corrosion and decoration of the surface of the material. The purpose of the processing is to make the surface of the workpiece anti-corrosion, and the appearance of the workpiece should have good gloss. After galvanized products come off the production line, due to changes in air temperature and humidity or after a period of storage, crystallization will occur on the surface of the zinc layer, causing rust (white rust) or graying. In order to prevent corrosion of galvanized products during transportation and storage, the galvanized layer needs to be passivated before it can be used for subsequent processing. Traditional passivation treatment uses chromate passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D13/04
Inventor 姚锦元陈婧汪红丁桂甫
Owner SHANGHAI JIAO TONG UNIV
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