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Cathodic electrophoresis pre-treatment liquor used on surface of hot-galvanized plate of automobile

A technology of hot-dip galvanized sheet and cathodic electrophoresis, applied in electrophoretic coating, electrolytic coating, metal material coating technology, etc., can solve the problems of high cost of rare earth salt, complicated preparation process, unfavorable production, etc., and achieve short processing time, The process is simple and the effect of reducing pollution

Active Publication Date: 2013-11-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned treatment solution can form a conversion film with good adhesion and excellent corrosion resistance, the cost of rare earth salt is high, the preparation process is complicated and time-consuming, and the preparation process requires a large amount of organic solvents, which is not conducive to the actual production of enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: The treatment liquid is calculated according to 1000g. At a temperature of 30°C, add 780g of water into reaction bottle 1, start stirring, then add 120g of KH560 at a rate of 10g / min, and stir evenly for 30 minutes to prepare liquid A (organosilane aqueous solution).

[0039] At a temperature of 30°C, add 90g of water to reaction bottle 2, start stirring, then add 6g of phosphoric acid at a rate of 1g / min, then add 1g of zinc oxide, stir for 10 minutes to make the mixture even, and then add 6g of phosphoric acid at a rate of 0.5g / min Add 1g of nickel nitrate, 1g of manganese nitrate, and 1g of ferrous nitrate in turn. Stir for 30 minutes to make liquid B.

[0040] Slowly and uniformly add liquid B into the reaction bottle containing liquid A and stir at a constant speed, and stir for 30 minutes to obtain the prepared treatment liquid.

[0041] The process of cathodic electrophoresis on the surface of hot-dip galvanized sheet is: pre-degreasing → degreasi...

Embodiment 2

[0043] Embodiment 2: The treatment liquid is calculated according to 1000g. At a temperature of 30°C, add 750g of water into reaction bottle 1, start stirring, then add 150g of KH560 at a rate of 10g / min, and stir evenly for 30 minutes to prepare liquid A (organosilane aqueous solution).

[0044]At a temperature of 30°C, add 90g of water to the reaction bottle 2, start stirring, then add 7g of phosphoric acid at a rate of 1g / min, then add 1g of zinc oxide, stir for 10 minutes to make the mixture even, and then add it at a rate of 0.5g / min Add 0.5g of nickel nitrate, 0.5g of manganese nitrate, and 1g of ferrous nitrate in turn. Stir for 30 minutes to make liquid B.

[0045] The process of cathodic electrophoresis on the surface of hot-dip galvanized sheet is: pre-degreasing → degreasing → washing → drying → surface treatment → electrophoresis.

[0046] The implementation process is simple, no surface adjustment is required before electrophoresis, and the prepared pretreatment...

Embodiment 3

[0047] Embodiment 3: Calculate according to 1000g of electrophoresis pretreatment solution. At a temperature of 30°C, add 800g of water into reaction bottle 1, start stirring, then add 100g of KH560 at a rate of 10g / min, and stir evenly for 30 minutes to prepare liquid A (organosilane aqueous solution).

[0048] At a temperature of 30°C, add 90g of water to reaction bottle 2, start stirring, then add 6g of phosphoric acid at a rate of 1g / min, then add 1g of zinc oxide, stir for 10 minutes to make the mixture even, and then add 6g of phosphoric acid at a rate of 0.5g / min Add 1g of nickel nitrate, 1g of manganese nitrate, and 1g of ferrous nitrate in turn. Stir for 30 minutes to make liquid B.

[0049] Slowly and uniformly add liquid B into the reactor containing liquid A and stir at a constant speed, and stir for 30 minutes to obtain the prepared treatment liquid.

[0050] The process of cathodic electrophoresis on the surface of hot-dip galvanized sheet is: pre-degreasing → ...

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Abstract

The invention discloses a cathodic electrophoresis pre-treatment liquor used on the surface of a hot-galvanized plate of an automobile, and belongs to the technical field for hot-galvanized plate surface processing. The treatment liquor consists of: by mass, 10-20% of an organic silane, 5-10% of a phosphatized component and the balance deionized water, wherein the phosphatized component consists of 0.8-1 g / L of manganous nitrate, 0.8-1.2 g / L of zinc oxide, 5-15 g / L of phosphoric acid, 0.8-1 g / L of nicdel nitrate and 0.8-1.5 g / L of ferrous(II) phosphate, and the organic silane is 3-(2,3-epoxypropoxy)propyltrimethoxysilane. The treatment liquor is adjusted in pH value to 3-4 by phosphoric acid, stirred for 30 minutes and allowed to stand for 1 hour, and then is usable. The treatment liquor has the characteristics of simple technological flow, rapid film forming, reduced production cost, reduced environmental pollutions and the like.

Description

Technical field: [0001] The invention belongs to the technical field of hot-dip galvanized sheet surface treatment, and in particular relates to a cathodic electrophoresis pretreatment solution for the surface of an automobile hot-dip galvanized sheet. Background technique: [0002] The existing cathodic electrophoretic coating process generally uses zinc, manganese, nickel trication phosphating solution for pretreatment to improve the corrosion resistance of the electrophoretic paint film and the bonding force of the workpiece surface, but the phosphating solution generally contains heavy metal phosphate and Environmentally harmful substances such as nitrite; at the same time, sediments are easily generated during the phosphating process, which affects the normal production. [0003] The paper "Electrophoretic coating room temperature phosphating process and alkali resistance of phosphating film" ("Material Protection", 2008, 41(4): 67~68) reported that by adding nickel sal...

Claims

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Application Information

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IPC IPC(8): C23C22/18C25D13/20
Inventor 张千峰孙晨阳叶鹏飞杨兴亮刘永钢柴立涛
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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