Anti-corrosion coating with low through-hole ratio for steel rebars and coating method

Patent metadata

Field	Value
Publication number	US-11008469-B2
Application number	US-201715747762-A
Country	US
Kind code	B2
Filing date	Mar 1, 2017
Priority date	Mar 4, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

The invention discloses an anti-corrosion coating with low through-hole ratio for steel rebars. The composition of coating includes 45-70 weight percent feldspar powder, 15-30 weight percent borax, 10-20 weight percent calcium tetraborate, 5-15 weight percent fluorspar, 4-8 weight percent clay, 1-10 weight percent adhesion agent, and 1-1.5 weight percent thickener. This invention also discloses a coating method using above-mentioned anti-corrosion coating. The method includes seven steps: 1. dry mixing, 2. wet mixing, 3. pretreatment, 4. coating, 5. baking, 6. sintering, 7. cooling down at room temperature. The coating of this invention has outstanding anti-corrosion resistance, extremely high toughness, and good durability.

First claim

What is claimed is:

1. An anti-corrosion coating with low through-hole ratio, the anti-corrosion coating comprising:
45-70 weight percent feldspar powder, 15-30 weight percent borax, 10-20 weight percent calcium tetraborate, 5-15 weight percent fluorspar, 4-8 weight percent clay, 1-10 weight percent adhesion agent, and 1-1.5 weight percent thickener.

2. The anti-corrosion coating of claim 1 , wherein the feldspar powder is capable of passing through a 800-1000 mesh sieve, and the fluorspar is capable of passing through a 500-800 mesh sieve.

3. The anti-corrosion coating of claim 1 , wherein the feldspar powder is potassium feldspar powder.

4. The anti-corrosion coating of claim 1 , wherein the feldspar powder is syenite powder or sanidine powder.

5. The anti-corrosion coating of claim 1 , wherein the adhesion agent comprises cobalt oxide, manganese dioxide, or nickel oxide, or a combination thereof.

6. The anti-corrosion coating of claim 1 , wherein the thickener comprises methylcellulose or carboxymethylcellulose sodium, or a combination thereof.

7. A method of coating steel rebars with the anti-corrosion coating of claim 1 , wherein the method comprises the steps of:
1) blending, without adding water, a mixture comprising the feldspar powder, the borax, the calcium tetraborate, the fluorspar, the clay, the adhesion agent, and the thickener that are weighted out according to a weight percent composition of claim 1 , wherein the mixture is placed in a container, stirred, and placed into a mixing machine to mix thoroughly to yield a mixture A;
2) adding water to the mixture A at a weight ratio of the mixture A to water (2-5):1 into the container, which is placed into a mixing machine to thoroughly mix to yield a slurry coating B;
3) pretreating steel rebars by removing rust of the steel rebars such that a surface of the steel rebars is washed and then dried;
4) coating the pretreated steel rebars obtained from step 3 such that the steel rebars are immersed in, rotated, and removed from the slurry coating B;
5) baking the coated steel rebars obtained from step 4 at 90-130° C. for 20-40 minutes;
6) sintering the baked steel rebars obtained from step 5 using a furnace such that the baked steel rebars obtained are heated up at a rate of 3-10° C./minute to 550-700° C. and maintained at 550-700° C. for 10 minutes; and
7) cooling down the sintered steel rebars at room temperature.

Assignees

• Univ Zhejiang

Inventors

• Yan Dongming
• Liu Yi
• Zhang Luodong
• Gao Haibo

Classifications

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• B05D3/0272

  with ovens · CPC title

• C09D1/04

  with organic additives · CPC title

• C03C8/00

  Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions · CPC title

• B05D1/18

  performed by dipping · CPC title