Inorganic anticorrosive coating layer for high-strength metal

An anti-corrosion coating and high-strength technology, applied in anti-corrosion coatings, coatings, etc., can solve problems such as high cracking strain of only 2000 microstrain, easy aging of epoxy resin coating, and failure to reach high-strength steel bars, etc., to improve cracking strain and impact resistance, increased brittleness, and improved brittleness

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN105131660 "Steel bar anti-corrosion coating and its coating method" discloses a coating mainly composed of glass powder and borax and containing fibers, but the cracking strain of the coating only reaches 700 microstrain
Chinese patent CN105238105 "A Tough Coating for Steel Bar Anticorrosion and Its Coating Method" improves the toughness of the coating by adding silicon carbide whiskers to the system mainly composed of mica powder and borax, but the coating is a A dense structure, the cracking strain can only reach 2000 microstrain, which still cannot meet the requirements for high-strength steel bars
However, epoxy resin coatings are prone to aging, and their durability is far inferior to that of inorganic coatings.

Method used

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  • Inorganic anticorrosive coating layer for high-strength metal
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  • Inorganic anticorrosive coating layer for high-strength metal

Examples

Experimental program
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Effect test

Embodiment 1

[0027]Preparation of paint: Take 150 grams of silicon dioxide, 100 grams of phosphorus pentoxide, 75 grams of aluminum oxide, 32.5 grams of sodium carbonate, 6 grams of potassium carbonate, 50 grams of calcium fluoride, 25 grams of boron oxide, 3 grams of nickel monoxide, 8.5 gram of cobalt monoxide, mixed evenly, and ground to make the powder through a 200-mesh sieve; get 25 grams of basalt fiber (diameter 1-2 micron, length 20-50 micron) and 25 gram of aluminum silicate fiber (diameter 1-2 micron , length 20-50 microns) into the sieved powder, mix evenly, set aside.

[0028] Substrate treatment: use sandblasting to remove rust and dirt on the surface of the steel bar, and dry it for later use; the steel bar is a HRB600 threaded steel bar with a strain of less than or equal to 2800 microstrains during use.

[0029] Coating: Ground the treated steel bar, and use an electrostatic spray gun to evenly coat the powder on the surface of the steel bar. The electrostatic voltage is 6...

Embodiment 2

[0033] Preparation of paint: Take 50 grams of silicon dioxide, 75 grams of silica, 50 grams of quartz, 75 grams of phosphorus pentoxide, 100 grams of alumina, 20 grams of sodium carbonate, 32 grams of potassium carbonate, 37 grams of calcium fluoride, 6 grams of trioxide Dinickel, 2 grams of cobalt monoxide, 3 grams of cobalt trioxide, mixed evenly and then ground to make the powder pass through a 200-mesh sieve; get 50 grams of aluminum silicate fiber (diameter 1-2 micron, length 20-50 micron) Add to the sifted powder, mix well and set aside.

[0034] Substrate treatment: use sandblasting to remove rust and dirt on the surface of the steel bar, and dry it for later use; the steel bar is a HRB600 threaded steel bar with a strain of less than or equal to 2800 microstrains during use.

[0035] Coating: Mix the powder and absolute ethanol at a mass ratio of 1.8:1, make it milky and shake well, dip the treated steel bar in the slurry for 5 seconds and take it out. The thickness is...

Embodiment 3

[0039] Preparation of paint: Take 125 grams of quartz, 100 grams of phosphorus pentoxide, 100 grams of aluminum oxide, 15.5 grams of sodium carbonate, 35 grams of calcium fluoride, 40 grams of boron oxide, 5.5 grams of nickel monoxide, 4 grams of cobalt trioxide, mix Grind after uniformity to make the powder pass through a 200-mesh sieve; take 50 grams of basalt fiber (2-5 microns in diameter, 50-80 microns in length), and 25 grams of calcium carbonate fiber (0.2-1 micron in diameter, 10-20 microns in length) Add to the sifted powder, mix well and set aside.

[0040] Substrate treatment: use sandblasting to remove rust and dirt on the surface of the steel bar, and dry it for later use; the steel bar is a HRB600 threaded steel bar with a strain of less than or equal to 2800 microstrains during use.

[0041] Coating: Ground the treated steel bar, and use an electrostatic spray gun to evenly coat the powder on the surface of the steel bar. The electrostatic voltage is 65 kV, the ...

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Abstract

The invention discloses an inorganic anticorrosive coating layer for a high-strength metal. The coating layer is formed on a high-strength metal surface by a coating through high-temperature sinteringat 500-800 DEG C, the coating comprises 25-35 parts of silicon oxide, 10-25 parts of phosphorus pentoxide, 10-25 parts of aluminum oxide, 2-15 parts of a fiber, 15-30 parts of a modifier and 1-3 parts of an anti-cracking agent, wherein the fiber is one or a combination of two or three of alumina silicate fiber, basalt fiber and calcium carbonate fiber; a plurality of sealing holes of which the diameters account for 1/30-1/10 of the thickness of the coating layer are distributed inside the coating layer; the number of the sealing holes is reduced from inside to outside; the aperture of a porous inner layer close to the high-strength metal surface is 2-15%; and the aperture of a dense outer layer far away from the high-strength metal surface is 0-2%. The coating layer is good in toughness,good in adhesion performance to a substrate, excellent in corrosion resistance, diverse in construction mode and low in use cost, and no crack penetrating through the coating layer can be caused in case of micro strain of 2800-3000.

Description

technical field [0001] The invention belongs to the field of engineering structures, in particular to an inorganic anticorrosion coating for high-strength metals. Background technique [0002] The application of high-strength steel bars can reduce the amount of steel per unit area, reduce costs, save energy and reduce emissions. In recent years, it has been gradually pushed to engineering applications. 500MPa-level high-strength steel bars have been widely used in engineering, and 600MPa-level high-strength steel bars were officially launched in 2018. Written into the national specification (GB-T1499.2-2018), and gradually promoted. If high-strength steel bars are corroded, their performance degradation will be more serious than ordinary steel bars. Therefore, the anti-corrosion of high-strength steel bars has become the primary problem to be solved in their application in corrosive environments. [0003] While cooperating with the deformation of the steel bar, no cracking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/08C09D7/61
CPCC09D1/00C09D5/08C09D7/61C09D7/70
Inventor 闫东明刘毅钱昊
Owner ZHEJIANG UNIV
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