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Method for preparing layered bimetallic hydroxide passivation film in situ

A layered bimetallic and hydroxide technology, applied in the field of metals, can solve the problems of complex methods and high consumption, and achieve the effects of simple process, easy operation, energy saving and environmental protection cost

Active Publication Date: 2021-02-02
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide an in-situ method for preparing a layered double metal hydroxide passivation film, aiming to solve the problems of complex and expensive methods for preparing a layered double metal hydroxide passivation film in the prior art

Method used

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  • Method for preparing layered bimetallic hydroxide passivation film in situ
  • Method for preparing layered bimetallic hydroxide passivation film in situ
  • Method for preparing layered bimetallic hydroxide passivation film in situ

Examples

Experimental program
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Effect test

preparation example Construction

[0066] The prepared layered double metal hydroxide passivation film has good stability, high bonding strength with the iron-based substrate, and is not easy to fall off. Due to the long growth time, the growth rate of each crystal nucleus is different. Therefore, the cross-nested structure of clustered nanoscale layered double hydroxides and submicron layered double hydroxides can block the erosion of harmful substances and delay the occurrence of corrosion of iron-based substrates, and The interlayer anions of the layered double metal hydroxide passivation film are carbonate ions, and the interlayer anions are carbonate ions, which can avoid adverse corrosion reactions caused by the replacement of harmful anions, and the layered bimetallic intercalation is carbonate ions Hydroxide passivation film has good gas storage characteristics, designability and repairability, and shows better corrosion resistance in alkaline cement-based environment, and can achieve the effect of green...

Embodiment 1

[0071] In Situ Fabrication of Layered Double Hydroxide Passivation Films

[0072] The method for preparing layered double metal hydroxide passivation film in situ, comprises the steps:

[0073] (1) Provide several Q235 steel bars with a length of about 3 mm and a diameter of 2.5 ± 0.3 mm; place the steel bars in a beaker filled with absolute ethanol, and place the beaker in an acoustic cleaning pool for 10 minutes and then wipe it clean , and then use 240-mesh, 500-mesh and 1000-mesh silicon sandpaper to polish the surface of the smooth round steel bar step by step to ensure that the surface state of each steel bar is basically the same. It is necessary to change and wash the steel bar twice, and after the absolute ethanol volatilizes, the steel bar base is obtained;

[0074] (2) Mix divalent metal nitrate solution, trivalent metal nitrate solution, urea and water to obtain a reaction solution. The solution is selected from the aluminum nitrate solution with a concentratio...

Embodiment 2

[0078] In Example 1 (3), "controlling heating from room temperature to a stable reaction temperature of 120° C. within 30 minutes, and reacting at a stable reaction temperature for 1 hour" was changed to "controlling heating from room temperature to a stable reaction temperature of 120° C. within 30 minutes. ℃, and reacted at a stable reaction temperature for 6 hours", and the other steps were the same.

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Abstract

The application provides a method for preparing a layered bimetallic hydroxide passivation film in situ. According to the method, the layered bimetallic hydroxide passivation film grows on the surfaceof an iron-based substrate in situ in one step by utilizing a hydrothermal method and in combination with urea decomposition; a hydrothermal reaction is performed on the iron-based substrate obtainedby pretreatment and a reaction solution containing urea, a divalent metal nitrate, and a trivalent metal nitrate to grow the layered bimetallic hydroxide passivation film; the preparation method is simple in technology; further, the thickness of the passivation film can be controlled by controlling a reaction time and a reaction temperature; thus, the anti-corrosive protection of a reinforcing steel bar is achieved; the excessive pretreatment does not need to be performed on the reinforcing steel bar in a reaction process; the preparation of the layered bimetallic hydroxide passivation film can be easily realized by adopting a one-step in-situ synthesis urea decomposition hydrothermal method; and the method is simple, convenient, easy to operate, energy-saving, environment-friendly, further, low in cost, and suitable for wide industrial production.

Description

technical field [0001] The application belongs to the field of metal technology, and in particular relates to a method for in-situ preparation of a layered double metal hydroxide passivation film. Background technique [0002] Steel is widely used in many fields such as shipbuilding, marine engineering, and civil engineering (reinforced concrete infrastructure or steel structures) due to its good mechanical properties, economic benefits, and mass production properties. However, the poor corrosion resistance of steel often makes the steel-based structure damaged before reaching its design service life, thus limiting the extensive development of steel in the above-mentioned applications. Especially in coastal environments, the attack of corrosive chlorides can easily lead to corrosion damage to steel. [0003] In order to prevent the corrosion of steel and limit its use, surface treatment, such as organic coating, is carried out. The use of organic coating is one of the main ...

Claims

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Application Information

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IPC IPC(8): C23C22/77C23C22/62B82Y30/00B82Y40/00
CPCC23C22/77C23C22/62B82Y30/00B82Y40/00
Inventor 洪舒贤董必钦邢锋秦韶丰张育新王琰帅
Owner SHENZHEN UNIV
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