Bright corrosion resisting zinc-iron alloy plating process

A zinc-iron alloy and electroplating process technology, which is applied in the field of bright and corrosion-resistant zinc-iron alloy electroplating with alkaline plating solution, can solve the problems of rough coating, low deposition rate, and low equipment pollution, and achieve fine and bright coating, good dispersion ability, and less inclusion effect

Inactive Publication Date: 2009-09-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the process of electrodepositing high-iron-zinc-iron alloys, the existing reports are mainly obtained in the sulfate system and the pyrophosphate system. The allowable current density of the sulfate system is high, and the pollution to the equipment is small, but its dispersion ability is poor. The coating is rough
In the 1970s, someone obtained a zinc-iron alloy coating with a high iron content from a pyrophosphate bath, but it was only used as the bottom layer of chrome plating, and it needs to be polished or plated with copper before chrome plating
At present, a bright zinc-iron alloy coating [Narasimhamurthy V, Sheshadri B S.Electrodeposition of zinc-iron from an alkalinesulfate bath containing methanolamine.Metal Finishing, 1997 (09) has been obtained in the alkaline bath containing 15% to 25% iron : 44-47], but the temperature is as high as 50°C during electroplating with this technology, heating is required to increase energy consumption during the electroplating process, and the cathode current efficiency is low (cathode current efficiency = actual zinc-iron alloy deposition amount ÷ theoretical zinc-iron alloy deposition amount) , only about 70%, the lower cathodic current efficiency makes the deposition rate slower in the electroplating process, and the energy consumption increases

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] The anode is made of stainless steel with a size of 50mm×40mm×1mm. The cathode is Q235 steel plate with a size of 40mm×30mm×1mm.

[0020] (1) Configure zinc-iron alloy plating solution: prepare 1000mL plating solution, the composition of the plating solution is: ZnO10g, NaOH 130g, triethanolamine 30mL, FeSO 4 ·7H 2 08g, 4mL of the compound (DE) of dimethylamine and epichlorohydrin, 0.8g of ethylenediaminetetraacetic acid, 0.04g of vanillin, 0.02g of sodium dodecylsulfonate, 2g of Zn powder. Add 400mL of water into the plating tank, pour the solid NaOH into the water, stir and dissolve, then add the ZnO that has been made into a paste, and add the NaOH solution under stirring. After it is completely dissolved, add water to 700mL, add 2g of Zn powder, stir for 30 minutes, and then clarify and filter. In a beaker, after diluting triethanolamine with 200 mL of water, FeSO 4 ·7H 2 O was added under stirring, and after it was completely dissolved, it was added to the pla...

Embodiment 2

[0031] The anode is made of stainless steel with a size of 50mm×40mm×1mm. The cathode is Q235 steel plate with a size of 40mm×30mm×1mm.

[0032] (1) Configure zinc-iron alloy plating solution: prepare 1000mL plating solution, the composition of the plating solution is: ZnO 8g, NaOH 100g, triethanolamine 20mL, FeSO 4 ·7H 2 O 7g, compound (DE) of dimethylamine and epichlorohydrin 2mL, ethylenediaminetetraacetic acid 1g, vanillin 0.02g, sodium dodecylsulfonate 0.04g, Zn powder 1g. Add 300mL water into the plating tank, pour the solid NaOH into the water, stir and dissolve, then add the NaOH solution to the ZnO that has been made into a paste while stirring. After it is completely dissolved, add water to 600mL, add 1g of Zn powder, stir for 25 minutes, and then clarify and filter. In a beaker, after diluting triethanolamine with 200 mL of water, FeSO 4 ·7H 2 O was added under stirring, and after it was completely dissolved, it was added to the plating tank, and then the compo...

Embodiment 3

[0036] The anode is made of stainless steel with a size of 50mm×40mm×1mm. The cathode is Q235 steel plate with a size of 40mm×30mm×1mm.

[0037] (1) Configure zinc-iron alloy plating solution: prepare 1000mL plating solution, the composition of the plating solution is: ZnO 6g, NaOH 150g, triethanolamine 50mL, FeSO 4 ·7H 2 O 13g, dimethylamine and epichlorohydrin compound (DE) 6mL, ethylenediaminetetraacetic acid 0.6g, vanillin 0.1g, sodium dodecylsulfonate 0.1g, Zn powder 2g. Add 500mL water into the plating tank, pour solid NaOH into the water, stir and dissolve, then add NaOH solution to the ZnO that has been made into a paste while stirring. After it is completely dissolved, add water to 800mL, add 2g of Zn powder, stir for 30 minutes, and then clarify and filter. In a beaker, after diluting triethanolamine with 200 mL of water, FeSO 4 ·7H 2 O was added under stirring, and after it was completely dissolved, it was added to the plating tank, and then the compound (DE) o...

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Abstract

The invention discloses a bright corrosion resisting zinc-iron alloy plating process which comprises the step of adding complexing agent and ferrous ion to zincate zincification solution. Zinc-iron alloy plating bath comprises 6-12g / L of ZnO, 90-150 g / L of NaOH, 20-50 mL / L of trolamine, 5-13g / L of FeSO4.7H2O, 2-8mL / L of DE, 0.5-1g / L of ethylenediamine tetracetic acid, 0.02-0.1 g / L of vanillina, 0.02-0.1 g / L of dodecyl sodium sulfate and 1-2 g / L of Zn powder. The process can reach the cathode current efficiency of 90 percent, is easy to control the alloy component and can obtain bright zinc-iron alloy plating containing 17-20 percent of iron; in addition, electrochemistry and salt-spray fog corrosion results show that the bright zinc-iron alloy plating has better corrosion resistance than pure zinc plating chromating, and the bright zinc-iron alloy plating has better protection property and decoration performance.

Description

technical field [0001] The invention relates to a metal surface electroplating zinc alloy process, in particular to an alkaline plating solution electroplating bright corrosion-resistant zinc-iron alloy process. Background technique [0002] As one of the effective steel surface protection processes, galvanizing has been widely used in the protection of steel components, accounting for about 1 / 3 to 1 / 2 of the entire electroplating industry. However, with the development of science and technology, the requirements for the use of coatings are getting higher and higher. On the basis of galvanizing, zinc-based alloy coatings and zinc-based composite coatings have been developed. Zinc-based alloy coatings include Zn-Ni, Zn-Fe, Zn-Co, Zn-Cu, Zn-Mn, etc. Among them, the zinc-iron alloy coating has been studied and applied most because of the wide source of iron and low cost. [0003] Zinc-iron alloy coatings are divided into low-iron zinc-iron alloy coatings and high-iron zinc-ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 许乔瑜田寿生
Owner SOUTH CHINA UNIV OF TECH
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