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A phosphate-based anti-corrosion coating for steel bars

An anti-corrosion coating, phosphate technology, applied in the coating, metal material coating process and other directions, can solve the problems of easy damage, loss of steel protection effect, etc., to achieve good bonding performance, dense structure, good coating performance Effect

Active Publication Date: 2017-03-08
上海宇砼建筑科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coatings applied to the concrete surface are directly affected by the marine environment and are easily damaged, losing their protective effect on the steel bars in the concrete.

Method used

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  • A phosphate-based anti-corrosion coating for steel bars
  • A phosphate-based anti-corrosion coating for steel bars
  • A phosphate-based anti-corrosion coating for steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0024] A phosphate-based steel anticorrosion coating is prepared from phosphate binder, iron oxide, micro-silica fume, aluminum powder, magnesium oxide, and aldehyde-based resin modifier raw materials, and the parts by weight of each raw material are listed in the table 1.

[0025] Table 1 raw material ratio

[0026]

[0027]

[0028] Prepared as follows:

[0029] 1) Add aluminum hydroxide to phosphoric acid, heat and keep it at 70-90°C for 3-5h to obtain a phosphate binder;

[0030] 2) taking the phosphate binder as the base liquid, adding an aldehyde-based resin modifier, iron oxide, micro-silica fume, aluminum powder and magnesium oxide, grinding and stirring evenly to obtain a phosphate coating;

[0031] Iron oxide is used as pigment and filler, which also has anti-corrosion effect.

[0032] Microsilica fume is a filler for phosphate coatings, improving the viscosity and compactness of coatings.

[0033] Magnesium oxide is used as a curing agent to achieve room t...

Embodiment A-F

[0040] For the anti-corrosion phosphate-based coating material, the parts by weight of each raw material are shown in the table below. The preparation process is the same as above.

[0041] The parts by weight of each raw material in table 3

[0042]

[0043] The salt spray resistance performance of the obtained phosphate coating material refers to the attached figure 1 shown. From figure 1 The effect of the amount of aldehyde-based resin modifier added on the salt spray resistance of the coating can be seen that the salt spray resistance time of the phosphate coating starts to increase with the decrease of the proportion; when the proportion is 7:3, the salt spray resistance The fog time is 1825h; then as the ratio decreases, the salt spray resistance time begins to decrease again.

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Abstract

The invention discloses a steel rebar anticorrosive coating material for marine reinforced concrete. The steel rebar anticorrosive coating material is prepared by the following steps: adding aluminium hydroxide into phosphoric acid, heating and carrying out thermal insulation at 70-90 DEG C for 3-5 h so as to obtain a phosphate binder; and using the phosphate binder as a base solution, adding an aldehyde resin modifier, chrome oxide, iron oxide, macro-silicon powder, aluminium powder and magnesium oxide, grinding and uniformly stirring to obtain a phosphate coating. The steel rebar anticorrosive coating material comprises the following ingredients, by weight, 5-12 parts of the phosphate binder, 3-7 parts of iron oxide, 3-7 parts of macro-silicon powder, 8-12 parts of aluminium powder, 1-3 parts of magnesium oxide and 1-3 parts of aldehyde resin. The anticorrosive phosphate based coating material can be cured at normal temperature, and curing time can be adjusted according to requirements. Application of the phosphate coating is popularized. After cured, the coating material has high strength and compact structure and can stably be combined with a concrete structure. By the use of the coating material, a steel rebar can be protected well.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a coating material used for corrosion of steel bars in marine reinforced concrete. Background technique [0002] In buildings under marine environmental conditions, reinforced concrete is the most commonly used building material, and concrete is a good natural protective material for steel bars. However, in the marine environment, the reliability of this concrete protective layer is not enough. The marine construction project will be more damaged due to the direct action of corrosive ions in seawater and the alternation of wet and dry under marine environmental conditions. Seriously, for the steel bars of offshore concrete structures, it has better economic benefits and application value to protect them with anti-corrosion coatings. [0003] Adding polyacrylic acid latex, styrene-butadiene latex, epoxy resin latex, water-soluble epoxy resin, polyvinyl acet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/00
CPCC08K3/08C08K3/22C08K3/36C08K2003/0812C08K2003/222C08K2003/2272C09D1/00C09D5/103C09D7/61C09D7/65
Inventor 陈友治孙涛王长雨李新平闫革韩卫卫孙冕崔静恩
Owner 上海宇砼建筑科技股份有限公司
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