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Rapid phosphating agent for galvanized steel sheets for color coating and application thereof

A technology of galvanized steel sheet and phosphating agent, which is applied in the coating process of metal materials, etc., can solve the problems of short processing time and inability to meet the pre-treatment production requirements of color-coated steel sheets, and achieve short processing time, superior performance, and energy saving Effect

Inactive Publication Date: 2017-11-07
杭州五源科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid phosphating process or phosphating solution disclosed in patents such as CN201410124896.4 is only qualitatively "short processing time" (it is not quantitatively described as fast); The disclosed rapid phosphating process or phosphating solution shows that the phosphating treatment time is 1.5-6 minutes, or even longer; patents such as CN201210187500.1 disclose a fast electrolytic phosphating solution suitable for wire drawing and its phosphorus Chemical process, its processing time is 5-120 seconds, but its application is limited due to the need to equip power supply and electrode system
The many rapid phosphating processes or phosphating solutions mentioned above still cannot meet the pretreatment production requirements of high-speed color-coated steel sheets

Method used

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  • Rapid phosphating agent for galvanized steel sheets for color coating and application thereof
  • Rapid phosphating agent for galvanized steel sheets for color coating and application thereof
  • Rapid phosphating agent for galvanized steel sheets for color coating and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation and application of the rapid phosphating agent for electro-galvanized steel sheet for color coating is characterized in that: the mass percentage of each component of the raw material is:

[0028]

[0029]

[0030] The preparation method of described rapid phosphating solution comprises the steps:

[0031] (1) add phosphoric acid in reactor, open reactor and stir;

[0032] (2) Add 40-50% of the total amount of water required in the reactor;

[0033] (3) Add slurry-like zinc oxide adjusted with a small amount of water in advance into the reactor, and stir to make it completely dissolve;

[0034] (4) Add to 80-90% of the total amount of water required in the reactor;

[0035] (5) Add zinc nitrate, tartaric acid, phytic acid, fluosilicic acid, sodium nitrate / hydroxylamine sulfate (5:1 mixture) into the reaction kettle respectively, stir evenly to mix thoroughly;

[0036] (6) Add ferrous sulfate solution and EDTA solution (concentration is 0.2mol / L)...

Embodiment 2

[0042] The preparation and application of the rapid phosphating agent for electro-galvanized steel sheet for color coating is characterized in that: the mass percentage of each component of the raw material is:

[0043]

[0044]

[0045] The preparation method step of described fast phosphating solution is the same as embodiment 1.

[0046] The rapid phosphating solution is used for the rapid phosphating treatment of color-coated galvanized steel sheets at a temperature of 35°C, a pH of 2.5, and a time of 6 seconds, and is treated by roller coating. The treated electro-galvanized substrate has been tested, and the phosphating film is uniform, fine, smooth and without exposed bottom, the brightness is 87%, and no red rust appears in the neutral salt spray test for 48 hours, which meets the technical requirements of the product.

Embodiment 3

[0048] The preparation and application of the fast phosphating agent for hot-dip galvanized steel sheet for color coating is characterized in that: the mass percentage of each component of the raw material is:

[0049]

[0050] The preparation method step of described fast phosphating solution is the same as embodiment 1.

[0051] The rapid phosphating solution is used for the rapid phosphating treatment of the hot-dip galvanized steel sheet for color coating. The temperature is 20°C, the pH is 2.8, and the time is 8 seconds. Roller coating is used for treatment. The treated hot-dip galvanized base material has been tested, and the phosphating film is uniform, fine, smooth and without exposed bottom, and no red rust appears in the neutral salt spray test for 72 hours, which meets the technical requirements of the product.

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Abstract

The invention discloses a rapid phosphating agent for a galvanized steel sheets for color coating and application thereof. The rapid phosphating agent is mainly composed of zinc oxide, phosphoric acid, nitrate, organic acid (salt), an organic phosphorus compound, an inorganic fluorine complex, a compound accelerant, an additive, water, etc., and can be applied to rapid galvanized steel phosphating for color steel sheets before coating. The rapid phosphating agent has the advantages of short treatment time and high-efficiency film forming, can form a phosphating film on the surface of a galvanized based sheet within 5-15 seconds, conducts treatment at normal temperature without heating, and saves energy. A phosphating film layer is uniform, fine and smooth and has no show through, and the test time of resistance to neutral salt spray reaches above 48 hours.

Description

technical field [0001] The invention relates to a treatment technology for metal surface protection, in particular to a quick phosphating agent for color-coated galvanized steel sheets and its application. technical background [0002] The color-coated steel plate is made of cold-rolled strip steel or galvanized steel plate (electro-galvanized and hot-dip galvanized) as the substrate on the continuous unit, and is coated with a continuous method after surface coating pre-treatment (degreasing, cleaning, chemical conversion treatment). Coating (roller coating method), a product made by baking, curing and cooling. Because the color-coated steel sheet has both the good colorability, formability, corrosion resistance, and decoration of the organic coating, as well as the high strength and ease of processing of the steel sheet, it can be easily processed and manufactured, and is widely used. In construction, electrical appliances, transportation and other production fields. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36
CPCC23C22/362
Inventor 钟金环彭强徐孙令张凯李翀王一建
Owner 杭州五源科技实业有限公司
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