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Method for improving corrosion resistance of non-phosphorus pretreatment agent

A pretreatment agent and corrosion resistance technology, which is applied in the direction of metal material coating process, etc., can solve the problems that the corrosion resistance cannot meet the requirements, and the phosphorus-free surface treatment technology cannot meet the use requirements, etc., so as to improve the bonding force and enhance the Corrosion resistance, effect of improving corrosion resistance

Active Publication Date: 2021-10-19
NANJING KERUN LUBRICANTS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some coating industries with high-quality requirements, the non-phosphorus surface treatment technology still cannot meet the actual use requirements (mainly because the corrosion resistance cannot meet the requirements)
The existing improved technology for the formulation of phosphorus-free pretreatment agent can almost reach the limit in the improvement of the corrosion resistance of the final paint film, so the improvement of corrosion resistance requires the development of new methods

Method used

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  • Method for improving corrosion resistance of non-phosphorus pretreatment agent
  • Method for improving corrosion resistance of non-phosphorus pretreatment agent
  • Method for improving corrosion resistance of non-phosphorus pretreatment agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of surface conditioner of the present invention:

[0022] For every 1 liter of surface conditioner, add the following components to mix and prepare:

[0023] Zirconium nitrate pentahydrate: 10g

[0024] Modified silica sol solution: 100g

[0025] Potassium fluoride: 10g

[0026] Triethanolamine: 5g

[0027] Use sodium hydroxide and nitric acid solution to adjust the pH of the surface regulator to 8.5;

[0028] The balance is deionized water.

[0029] Among them, the preparation of the modified silica sol is mainly divided into three steps: the preparation of the original silica sol, the molecular chain of the grafted epoxy reactive diluent 748 and the chemical structure of the grafted EDTA. Specifically:

[0030] (1) Preparation of original silica sol solution: Dissolve 2.5mL tetraethyl orthosilicate (TEOS) in 20mL absolute ethanol to form a TEOS solution, add 80mL absolute ethanol, 2mL high-purity water and 1mL ammonia water to the reaction vessel...

Embodiment 2

[0035] The preparation of surface conditioner of the present invention:

[0036] For every 1 liter of surface conditioner, add the following components to mix and prepare:

[0037] Zirconium nitrate pentahydrate: 5g

[0038] Modified silica sol solution: 150g

[0039] Potassium fluoride: 7g

[0040] Triethanolamine: 3g

[0041]Use sodium hydroxide and nitric acid solution to adjust the pH of the surface regulator to 6;

[0042] The balance is deionized water.

[0043] The preparation method of modified silica sol solution in embodiment 2 is consistent with embodiment.

Embodiment 3

[0044] Embodiment 3 (electrophoretic coating film performance)

[0045] Test plate: commercially available standard cold-rolled iron plate with a specification of (150mm×70mm×0.8mm).

[0046] Process flow:

[0047] Degreasing and degreasing→Tap water washing→Pure water washing→Surface adjustment→Phosphate-free surface treatment→Electrophoretic coating→High temperature curing

[0048] Brief introduction of each process flow:

[0049] Degreasing treatment: use a commercially available degreasing agent for heated cold-rolled sheets, soak the cold-rolled sheets at 50°C for 5 minutes, supplemented by manual swinging and scrubbing, etc., to ensure that the surface is degreased and clean.

[0050] Water washing after degreasing: wash in tap water at room temperature for 1 minute, and in pure water for 1 minute.

[0051] Surface adjustment: Use the diluent prepared by the surface adjustment agent in Example 1 to adjust the surface of the plate, soak the plate in the surface adjustm...

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Abstract

The invention discloses a method for improving corrosion resistance of a non-phosphorus pretreatment agent, the method is characterized in that before non-phosphorus pretreatment, a surface conditioning agent is adopted to carry out microstructure adjustment on the surface of a metal base material, so that uniformly distributed crystal nucleuses are formed on the surface of the metal base material. The surface conditioning agent is used for treating the surface of the metal base material before non-phosphorus pretreatment, so that the corrosion resistance of a non-phosphorus pretreatment agent film layer is effectively improved (a zirconium film layer is more compact), the corrosion resistance of a paint film is further effectively improved, and the etching width of a lineation single side is smaller than 2 mm; and the subsequent binding force of the paint film and the metal base material can also be improved.

Description

technical field [0001] The invention relates to a method for improving the corrosion resistance of a phosphorus-free pretreatment agent, and belongs to the technical field of metalworking fluid treatment. Background technique [0002] With the improvement of environmental protection requirements, the metal material surface treatment industry is facing more and more environmental protection pressure. In order to reduce the content of nitrogen, phosphorus and heavy metals in wastewater, the green production and use of surface treatment agents has become an inevitable trend in the development of the industry. Among them, ceramic technology and silane technology, as typical representatives of phosphorus-free surface treatment, account for an increasing proportion in the industry. Compared with traditional metal surface treatment such as phosphating and passivation technologies, the metal ions in silane and vitrification agents have less environmental pollution and will not cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/62C23C22/68
CPCC23C22/62C23C22/68
Inventor 张荣金付海罗孔繁龙许能才陈光赵凯利
Owner NANJING KERUN LUBRICANTS