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Multi-purpose ammonium-free fluxing agent for hot dip coating and application method thereof

A technology of flux and hot-dip plating, which is applied in hot-dip plating process, metal material coating process, coating, etc., and can solve problems that have not been applied

Inactive Publication Date: 2014-04-23
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also someone proposes a phytate flux, but due to comprehensive factors such as cost and environmental protection, it has not been applied

Method used

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  • Multi-purpose ammonium-free fluxing agent for hot dip coating and application method thereof
  • Multi-purpose ammonium-free fluxing agent for hot dip coating and application method thereof
  • Multi-purpose ammonium-free fluxing agent for hot dip coating and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Take 300g of zinc chloride, 24g of sodium chloride, 12g of calcium chloride, 60g of stannous chloride, and 60g of potassium fluorozirconate, add 1L of water to prepare a plating flux solution, heat the solution to 70°C, and stir thoroughly during the heating process uniform. Immerse the Q235 steel sheet with the size of 50×50×2mm that has been washed by alkali cleaning, degreasing, pickling and rust removal in the fluxing solution for 4 minutes, and then take the Q235 steel sheet out of the fluxing solution, at a temperature of 120 Dry in a drying oven at ℃ for 4 minutes, then immerse in Galvalume molten pool for hot-dip plating, no zinc explosion occurs during immersion, a small amount of smoke and dust are generated on the surface of the molten pool, and there are floating black oxides on the surface of the molten pool; the dipping is completed Finally, the Q235 steel sheet was slowly lifted out of the molten pool and then quickly water-cooled. It was fou...

Embodiment 2

[0025] Example 2: Take 240g of zinc chloride, 10g of sodium chloride, 5g of calcium chloride, 20g of stannous chloride, and 16g of potassium fluorozirconate, add 1L of water to prepare a plating flux solution, heat the solution to 70°C, and stir thoroughly during the heating process uniform. Immerse the Q235 steel sheet with the size of 50×50×2mm that has been washed by alkali cleaning, degreasing, pickling and rust removal in the fluxing solution for 4 minutes, and then take the Q235 steel sheet out of the fluxing solution, at a temperature of 120 Dry in a drying oven at ℃ for 4 minutes, then immerse in Galvalume molten pool for hot-dip plating, no zinc explosion occurs during immersion, a small amount of smoke and dust are generated on the surface of the molten pool, and there are floating black oxides on the surface of the molten pool; after dipping is completed The Q235 steel sheet was slowly lifted out of the molten pool and then quickly water-cooled. It was found that ...

Embodiment 3

[0026] Example 3: Take 300g of zinc chloride, 20g of sodium chloride, 10g of calcium chloride, 40g of stannous chloride, and 50g of potassium fluorozirconate, add 1L of water to prepare a plating flux solution, heat the solution to 70°C, and stir thoroughly during the heating process uniform. After the Q235 steel sheet with the size of 50×50×2mm is degreased by alkali, pickled and derusted by pickling, and then rinsed, it is immersed in the flux solution for 4 minutes, then taken out of the flux solution, and placed in a drying oven at a temperature of 120°C. Dry in the middle for 4 minutes, then dip into the pure zinc molten pool for hot-dip plating, no zinc explosion occurs during immersion, a small amount of smoke and dust are generated on the surface of the molten pool, and there are floating black oxides on the surface of the molten pool; after the dipping is completed, the Q235 steel sheet After being slowly lifted from the molten pool, it was quickly water-cooled. It ...

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Abstract

The invention provides a multi-purpose ammonium-free fluxing agent for hot dip coating and an application method thereof. The multi-purpose ammonium-free fluxing agent is suitable for hot dip coating of zinc-aluminum alloys with various aluminum contents, and is good in fluxing effect, small in soot content during hot dip coating and capable of perfecting the production environment. According to the technical scheme of the invention, the matching components of per liter of fluxing solution comprise 240-300 g of ZnCl2, 10-24 g of NaCl, 5-12 g of CaCl2, 20-60 g of SnCl2, 16-60 g of K2ZrF6 and the balance of water. Before the fluxing solution is used, a workpiece is subjected to alkali washing in a 10-25% NaOH solution at 60-80 DEG C for deoiling, is pickled in 20-40% HCL solution at normal temperature for derusting after being washed with water and is washed with water again, then the workpiece is soaked in the ammonium-free fluxing agent for fluxing treatment, the temperature of the fluxing solution is controlled within 40-80 DEG C, and finally, the workpiece is dried in a drying box of 90-120 DEG C after the fluxing treatment. The characteristics of the fluxing solution are as follows: the components of the fluxing agent generate no mutual reaction, corrosion on a matrix is small, oxides on the surface of a molten pool can be cleaned to effectively protect the matrix, decomposition products do not enter zinc bath, and the cost is low.

Description

technical field [0001] The invention provides a multi-purpose ammonium-free plating flux for hot-dip plating and a method for using the same, which belong to the technical field of surface plating of iron and steel materials. Background technique [0002] Before hot-dip galvanizing, iron and steel parts need to be washed with alkali to remove oil and pickle to remove rust, and there is also a flux-assisted plating treatment. At present, countries all over the world adopt this method for batch hot-dip galvanizing. As an important process in the pretreatment of hot-dip galvanizing, fluxing not only directly affects the quality of the coating, but also has a greater impact on the corrosion resistance of the coating and the cost of zinc consumption. It is generally believed that the main function of the flux is to: remove the residual iron salt on the surface of the workpiece after pickling, and dissolve the generated FeO, thereby improving the surface activity; it can form a u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02
Inventor 李智王韬尹付成王鑫铭刘永雄赵满秀
Owner XIANGTAN UNIV
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