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Graphene enhanced phytic acid-based passivator, preparation method and application

A passivating agent and graphene technology, applied in the coating process of metal materials, etc., can solve the problems of easy cracking and poor anti-corrosion performance, and achieve the effects of small production time, improved anti-corrosion ability, and simple preparation process

Active Publication Date: 2021-08-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional phytic acid-based chemical conversion film has the disadvantages of easy cracking and poor anti-corrosion performance during the preparation process. Improving the crack resistance and compactness of the phytic acid-based chemical conversion film is the primary problem to be solved at present.

Method used

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  • Graphene enhanced phytic acid-based passivator, preparation method and application
  • Graphene enhanced phytic acid-based passivator, preparation method and application

Examples

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preparation example Construction

[0029] The second aspect of the present invention provides a method for preparing a graphene-enhanced phytic acid-based passivator, comprising the following steps: dissolving phytic acid into deionized water, then adding zinc nitrate, stirring evenly, until the phytic acid-based zinc nitrate is completely dissolved ; Then adjust the solution to be alkaline, add aminated modified graphene, and use ultrasonic vibration to stir, so that the graphene is evenly suspended in the solution.

[0030] Further, using sodium hydroxide, potassium hydroxide or ammonia water to adjust the pH;

[0031] Further, the solution is adjusted to pH 10-12.

[0032] The third aspect of the present invention provides a method for using a graphene-enhanced phytic acid-based passivator: directly soak the steel bar whose surface has been degreased and polished in the passivator, take it out after standing for ten minutes, rinse it with distilled water, and use Dry quickly with a hair dryer.

[0033] The...

Embodiment 1

[0036]In terms of parts by mass, dissolve 0.3 parts of phytic acid into 60 parts of deionized water, then add 0.3 parts of zinc nitrate, and stir evenly until the phytic acid-based zinc nitrate is completely dissolved; then slowly add sodium hydroxide, and stir while adding , observe the change of the solution, when the solution changes from turbid to clear, the measured pH is about 10-12; finally add 0.06 parts of modified graphene, and use ultrasonic vibration to stir, so that the graphene is evenly suspended in the solution, and a Graphene-enhanced phytic acid-based passivators.

[0037] Directly soak 10 samples of steel bars whose surface has been degreased and polished in the passivating agent, let it stand for ten minutes, take it out, rinse it with distilled water, and quickly dry it with a hair dryer.

[0038] Put 5 steel bar samples in the air for seven days to observe the changes of the samples; place the other 5 steel bar samples in the mortar mixed with 0.1wt% NaCl...

Embodiment 2

[0040] In terms of parts by mass, dissolve 0.6 parts of phytic acid into 60 parts of deionized water, then add 0.3 parts of zinc nitrate, stir evenly, and wait until the phytic acid-based zinc nitrate is completely dissolved; then slowly add sodium hydroxide, and stir while adding , observe the change of the solution, when the solution changes from turbid to clear, the measured pH is about 10-12; finally add 0.08 parts of modified graphene, and use ultrasonic vibration to stir, so that the graphene is evenly suspended in the solution, and a kind of Graphene-enhanced phytic acid-based passivators.

[0041] Directly soak 10 samples of steel bars whose surface has been degreased and polished in the passivating agent, let it stand for ten minutes, take it out, rinse it with distilled water, and quickly dry it with a hair dryer.

[0042] Put 5 steel bar samples in the air for seven days to observe the changes of the samples; place the other 5 steel bar samples in the mortar mixed w...

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Abstract

The invention belongs to the field of marine reinforced concrete engineering corrosion inhibitors, and particularly relates to a graphene reinforced phytic acid-based passivator, a preparation method and an application. The passivator is an alkaline aqueous solution and is prepared from the following components in percentage by mass: 0.1 to 1.0 percent of phytic acid, 0.1 to 0.5 percent of zinc nitrate and 0.05 to 0.1 percent of amination modified graphene. According to the invention, by compounding a modified graphene material and a phytic acid material, amination modification is performed on active sites of the graphene material, so that the bonding capacity between graphene and phytic acid heteroatom groups is enhanced, and based on a layer-by-layer self-assembly reaction among a chelating agent, a nano functional structure material and a metal matrix, a graphene / phytic acid composite chemical conversion film with a spatial three-dimensional structure is constructed, so that steel bar passivation is achieved, and meanwhile, no crack and long-term corrosion resistance of the film layer are achieved, and the service life of a reinforced concrete structure is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of rust inhibitors for marine reinforced concrete engineering, and more specifically relates to a graphene-enhanced phytic acid-based passivator, a preparation method and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In the marine environment with high salinity and high humidity, the corrosion of steel bars caused by chloride ion corrosion is the main crux of the durability degradation and structural failure of reinforced concrete materials, and has become a worldwide problem in the field of concrete research. In view of the ubiquity of steel bar corrosion, it is urgent to protect the steel bar fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
CPCC23C22/50
Inventor 熊传胜孙雪金祖权丛颖周欣雨郝梦圆高堃陈帅良
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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