Chromium-free passivation composition for galvanized sheet and method for making and using the same

A chrome-free passivation, aluminum-zinc plating technology, applied in the coating process of metal materials, etc., can solve the problem that the chrome-free passivation treatment agent is not suitable for use, and achieve excellent salt spray performance, heat and humidity resistance, and excellent alkali resistance Effect

Active Publication Date: 2021-12-21
SHANGHAI XINGYU ECOSIL SURFACE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current chromium-free passivation treatment agent for aluminum-zinc plates is not suitable for use in alkaline environments, and to provide a new chromium-free passivation composition

Method used

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  • Chromium-free passivation composition for galvanized sheet and method for making and using the same
  • Chromium-free passivation composition for galvanized sheet and method for making and using the same
  • Chromium-free passivation composition for galvanized sheet and method for making and using the same

Examples

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Embodiment 1

[0049] The preparation method of phosphated polyvinyl alcohol (ammonium dihydrogen, ammonium monohydrogen) in embodiment 1,3,5: get a certain amount of polyvinyl alcohol, deionized water, after dissolving, add appropriate amount of phosphoric acid and urea and stir evenly, Raise the temperature to 110-120°C for 3 hours, then raise the temperature to 150°C and continue the reaction for 30 minutes to obtain a white solid polyvinyl alcohol phosphate-ammonium salt. The crude product is soaked and dried in ethanol first, then crushed, and then extracted by Soxhlet extractor for 8 hours to remove residual phosphoric acid, urea and biuret, etc., and vacuum-dried at 50-60°C for later use.

Embodiment 2

[0050] The preparation method of polyvinylphosphoric acid (ammonium dihydrogen, ammonium monohydrogen) in embodiment 2, 4, 6: take a certain amount of polyvinylphosphoric acid, deionized water, after dissolving, drop a certain amount of ammonia water, after stirring fully and uniformly, obtain Polyvinyl phosphate (ammonium dihydrogen, ammonium monohydrogen) salt. The crude product is firstly precipitated with ethanol to obtain a solid, which is vacuum-dried at 50-60°C for later use.

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Abstract

The invention provides a chromium-free passivation composition for galvanized sheet and its production and use method, the composition includes water and the following components: aqueous dispersion of organic resin, water-soluble rare earth corrosion inhibitor, organic functional Hydrolyzed oligomers of trialkoxysilanes and water-soluble phosphorus-containing polymers. The chromium-free passivation composition of the present invention not only has excellent corrosion resistance and damp heat resistance, but also has excellent alkali resistance. The purpose of using the aluminum-zinc plate in a highly alkaline environment can be achieved. The invention also discloses the preparation and application method of the chrome-free surface treatment composition.

Description

technical field [0001] The invention relates to a chromium-free passivation composition and its production and use method, in particular to a chromium-free passivation composition used in the production of galvanized coil steel and its production and use method. Background technique [0002] The aluminum-zinc coating (55% Al-45% Zn) is coated on the surface of the iron-based alloy through a hot-dipping process, and the corrosion of the iron-based alloy is delayed by the protection principle of the sacrificial anode. The thickness of the aluminum-zinc coating (GL) is usually 25 μm, which is similar to that of the ordinary hot-dip galvanized coating (GI), but the outdoor corrosion resistance of the GL board is much higher than that of the GI board. In addition, the appearance of aluminum-zinc panels is more exquisite than that of galvanized panels. Based on these advantages, aluminum-zinc panels are widely used in outdoor construction applications such as outdoor metal panels...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/68
CPCC23C22/68C23C2222/20
Inventor 张少欢朱洪帆陆海涛朱丹青俞威曾建峰
Owner SHANGHAI XINGYU ECOSIL SURFACE MATERIAL
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