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Chemical treatment liquid for steel material coating primer and method of treatment

一种化学转化处理、钢铁材料的技术，应用在钢铁材料的涂装底层用化学转化处理液及处理领域，能够解决难以得到涂膜密合性耐腐蚀性、钢铁材料无法确保被膜附着量等问题，达到良好涂装后耐腐蚀性、改善涂膜密合性、高耐腐蚀性的效果

Active Publication Date: 2011-06-08
NIHON PARKERIZING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this regard, because zirconium-based chemical conversion treatment can reduce the load on the environment, in recent years, chemical conversion treatment for the coating base of steel materials that replaces zinc phosphate treatment has gradually attracted attention, because it was originally a technology suitable for aluminum alloy materials, so It is not possible to secure a sufficient amount of coating film on steel materials, so it is difficult to obtain coating film adhesion and corrosion resistance after coating like zinc phosphate treatment

Method used

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  • Chemical treatment liquid for steel material coating primer and method of treatment
  • Chemical treatment liquid for steel material coating primer and method of treatment
  • Chemical treatment liquid for steel material coating primer and method of treatment

Examples

Experimental program
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Effect test

Embodiment 1）

[0136] Add 60 mass ppm of hexafluorozirconic acid aqueous solution as Zr, 40 mass ppm as Al (Al / Zr=67%), and 28% (17 mass ppm) of aluminum nitrate as Zr. Polyethylenimine A1, 55% hydrofluoric acid with a free fluorine concentration of 6 mass ppm, adjusted pH to 4.8 with 3% ammonia water, prepared a chemical conversion treatment solution, and heated to 45°C. In addition, polyethyleneimine A1 had a primary amino group ratio: 35 mol%, a secondary amino group ratio: 35 mol%, a tertiary amino group ratio: 30 mol%, and a weight average molecular weight of 600. It should be noted that the ratio of amino groups referred to here is the molar ratio of amino groups.

[0137] Using this chemical conversion treatment solution, the chemical conversion treatment of the cold-rolled steel sheet and the alloyed hot-dip galvanized steel sheet is performed, and a chemical conversion film is deposited and formed.

Embodiment 2）

[0139] Added 40% hexafluorozirconic acid aqueous solution at 100 mass ppm as Zr, aluminum nitrate at 50 mass ppm as Al (Al / Zr=50%), and 10% by mass of Zr (10 mass ppm) Polyethylenimine A2, 55% hydrofluoric acid with a free fluorine concentration of 10 mass ppm, adjusted pH to 4.0 with 3% ammonia water, prepared chemical conversion treatment solution, heated to 30°C. In addition, polyethyleneimine A2 had a ratio of primary amino group: 44 mol%, a ratio of secondary amino group: 38 mol%, a ratio of tertiary amino group: 18 mol%, and a weight average molecular weight of 800.

[0140] Using this chemical conversion treatment liquid, the chemical conversion treatment of the cold-rolled steel sheet is performed, and a chemical conversion coating is deposited and formed.

Embodiment 3）

[0142] Add 100 mass ppm of hexafluorozirconic acid aqueous solution as Zr, 50 mass ppm of Al (Al / Zr=50%) aluminum nitrate, 20 mass ppm of Cu as copper nitrate, and Zr The mass ratio is 10% (10 mass ppm) polyethyleneimine A2, 55% hydrofluoric acid that makes the free fluorine concentration reach 10 mass ppm, adjusts the pH to 4.0 with 3% ammonia water, prepares the chemical conversion treatment solution, and heats to 30°C. In addition, polyethyleneimine A2 had a ratio of primary amino group: 44 mol%, a ratio of secondary amino group: 38 mol%, a ratio of tertiary amino group: 18 mol%, and a weight average molecular weight of 800.

[0143] Using this chemical conversion treatment liquid, the chemical conversion treatment of the cold-rolled steel sheet is performed, and a chemical conversion coating is deposited and formed.

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Abstract

A chemical treatment liquid for steel material coating primer comprising a zirconium fluorine complex amounting to 50 to 500 ppm by mass in terms of Zr, free fluorine amounting to 5 to 50 ppm by mass and a polyethyleneimine of 300 to 10,000 weight average molecular weight wherein the molar ratios of primary amino and tertiary amino based on the total quantity of amino are 30% or more and 15% or more, respectively, amounting to 5 to 30% by mass based on Zr so as to exhibit a pH value of 3 to 5. Further, there is provided a relevant method of chemical treatment. In the instance of steel material coating, especially electrodeposition coating, there can be realized excellent coating film adhesion, post-coating corrosion resistance and coating adhering-around property.

Description

technical field [0001] The present invention relates to a chemical conversion treatment solution for coating primers and a chemical conversion treatment method capable of imparting excellent coating film adhesion and corrosion resistance after coating when coating steel materials. Background technique [0002] Conventionally, zinc phosphate treatment, zirconium-based chemical conversion treatment, and the like are known as methods for imparting corrosion resistance and coating film adhesion to iron and steel materials. [0003] For a long time, zinc phosphate treatment has been widely used as a chemical conversion treatment for the coating primer of steel materials. In addition, not only steel materials but also galvanized materials and aluminum alloy materials are effective. However, because the main components are phosphorus, which is an eutrophic element, or nickel, which may be carcinogenic, and a considerable amount of sludge is generated during processing, it has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C28/00C25D13/20
CPCC23C22/34C25D13/20C23C22/76C23C22/74
Inventor 石井均永岛康彦
Owner NIHON PARKERIZING
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