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High temperature resistant anti-corrosion Al-Zn alloy coated steel sheet and preparation method thereof

A high temperature resistant and anti-corrosion technology, applied in the field of high temperature resistant and anti-corrosion galvanized steel sheet

Inactive Publication Date: 2013-10-16
江苏克罗德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Because the above-mentioned patent application is aimed at hot-dip galvanized sheet, and because the above-mentioned patent application is proposed to improve the hardness and toughness of the coating, and also because the nano-hard particles are directly combined with the molten zinc layer The combination effect is debatable, and because the hot-dip galvanized steel sheet is not suitable for the applicant's above-mentioned occasions, etc., the patent application scheme has no reference for significantly improving the high-temperature resistance and corrosion resistance of the galvanized steel sheet. technical significance

Method used

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  • High temperature resistant anti-corrosion Al-Zn alloy coated steel sheet and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] figure 1 The preparation method of the high-temperature-resistant and anti-corrosion galvanized steel sheet of the shown structure comprises the following steps:

[0026] A) Steel plate cleaning, select cold-rolled steel plates with no defects such as scabs, pits and / or microcracks on the surface, and first clean the two sides of the cold-rolled steel plates with a disk brush, and then perform alkaline cleaning and electrolytic cleaning, In order to remove the surface oxide layer (film) and / or oil, after cleaning, it is introduced into a drying tunnel to dry to obtain the substrate 1. In this step, the thickness of the cold-rolled steel plate does not need to be limited, because it can usually be determined according to user requirements or according to Choose from a thickness of 0.1-4.5mm depending on the place of use;

[0027] B) Coating, using the dipping and pulling method to apply the structural layer material to the outward-facing side surface of the substrate 1 ...

Embodiment 2

[0031]Only change the cleaning in step A) to cleaning the two sides of the cold-rolled steel plate with a disk brush first, and then carry out pickling and electrolytic cleaning; the first structural layer 2 and the second structural layer 3 in step B) Change the thickness to 25 μm, change the mass percentage of aluminum in the aluminum-zinc-silicon ternary material to 57%, the content percentage of zinc to 42% and the mass percentage of silicon to 1%; change the trivalent chromium solution in step C) Change the mass concentration of 25g / L to 25g / L, change the drying temperature and drying time to 85°C and 40s respectively, change the thickness of the passivation layer 4 to 1 μm; change the calcination temperature and calcination time in step D) to 220 ℃ and 45s, change the thickness of the high temperature resistant anti-corrosion layer 5 to 35 μm, and change the parts by weight of the raw materials constituting the high temperature resistant anti-corrosion layer 5 to: 10 part...

Embodiment 3

[0033] Only change the cleaning in step A) to alkaline cleaning and then pickling on both sides of the cold-rolled steel plate; change the thicknesses of the first structural layer and the second structural layer 2 and 3 in step B) to 40 μm, change the mass percentage of aluminum in the aluminum-zinc-silicon ternary material to 53%, the content percentage of zinc to 44.5% and the mass percentage of silicon to 2.5%; change the mass concentration of the trivalent chromium solution in step C) Change it to 30g / L, change the drying temperature and drying time to 70°C and 55s respectively, change the thickness of the passivation layer 4 to 2μm; change the calcination temperature and calcination time in step D) to 250°C and 25s respectively , change the thickness of the high-temperature-resistant anti-corrosion layer 5 to 50 μm, and change the parts by weight of the raw materials that constitute the high-temperature-resistant anti-corrosion layer 5 into: 20 parts of organic silicon, 7...

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Abstract

A high temperature resistant anti-corrosion Al-Zn alloy coated steel sheet and a preparation method thereof belong to the technical field of coating steel sheets. The steel sheet comprises a baseplate, a first structural layer combined with one side surface of the baseplate, a second structural layer combined with the other side surface of the baseplate, and a passivation layer combined with the surface of the first structural layer, and is characterized in that the surface of the passivation layer is combined with a high temperature resistant anti-corrosion layer. The preparation method comprises the following steps: selecting a cold-roll steel sheet with a flawless surface, cleaning and drying the surface of the cold-roll steel sheet to obtain the baseplate; coating structural layer material on one side surface of the baseplate to form the first structural layer, while coating the structural layer material on the other side surface of the baseplate to form the second structural layer; performing passivation and drying treatment to the surface of the first structural layer by adopting a passivator; coating high temperature resistant anti-corrosion paint on the surface of the passivation layer by adopting a roller painting manner, and performing calcination and solidification to obtain a finished product. According to the invention, the high temperature resistant anti-corrosion Al-Zn alloy coated steel sheet cannot be eroded while being continuously used for a long time in a high-temperature environment, and cracking, fracture and the like are avoided.

Description

technical field [0001] The invention belongs to the technical field of coated steel sheets, in particular to a high-temperature-resistant and anti-corrosion aluminum-zinc coated steel sheet, and also relates to a preparation method thereof. Background technique [0002] Because the atmospheric corrosion resistance of galvanized steel sheet is 2-6 times that of hot-dip galvanized steel sheet, and because it has incomparable water corrosion resistance of hot-dip galvanized sheet and hot-dip aluminum sheet, and because of its outstanding corrosion resistance Thermal oxidation resistance enables long-term use at 300°C without discoloration and good water resistance and soil corrosion resistance at around 500°C for long-term use, so it is widely used as chimneys, pipes for conveying high-temperature media, and high-temperature furnaces Materials such as appliances, ovens, automobile exhaust pipes and heat-proof heat shields of various catalytic heat exchangers. However, the wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/04B32B15/20B32B33/00B32B37/02
Inventor 李丽王海英姚天宇
Owner 江苏克罗德科技有限公司
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