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Preparation method of sol-gel coating with corrosion monitoring function

A corrosion monitoring and sol-gel technology, which is applied in the field of sol-gel coating preparation, can solve the problems of inconspicuous fluorescence phenomenon, fluorescent agent corrosion monitoring function, and affecting the sensitivity of fluorescence monitoring, etc.

Inactive Publication Date: 2019-04-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Furthermore, improper coating formulations will cause the fluorescent agent to react with the components in the coating before corrosion, resulting in the failure of the corrosion monitoring function of the fluorescent agent; in addition, the added concentration of the fluorescent agent will also significantly affect the sensitivity of fluorescence monitoring. Low concentration of fluorescent agent often makes the fluorescence phenomenon inconspicuous, while high concentration of fluorescent agent will reduce the crosslinking degree of the coating itself and affect the protective performance of the coating

Method used

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  • Preparation method of sol-gel coating with corrosion monitoring function
  • Preparation method of sol-gel coating with corrosion monitoring function
  • Preparation method of sol-gel coating with corrosion monitoring function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 22 mL of absolute ethanol and 13 mL of ethyl acetoacetate to a dry anhydrous beaker, slowly add 19 mL of zirconium n-propoxide under stirring conditions, and stir at room temperature for about 30 minutes to prepare a zirconium sol;

[0025] (2) Use 50mL absolute ethanol as a solvent, add 2.5mM salicylaldehyde, stir evenly, add 26ml deionized water, add 42mL silane coupling agent under stirring conditions, and stir for 30 minutes to obtain the corrosion monitoring substance silica sol;

[0026] (3) Mix the two sols prepared in steps (1) and (2) under stirring conditions, and adjust the pH to 3.5 with nitric acid;

[0027] (4) The aluminum alloy sample is coated for the first time using the dipping and pulling method, and after standing in the air for 15 minutes, the secondary coating is carried out, and the air is left standing for 30 minutes;

[0028] (5) Heat the coating sample obtained in (4) at 60°C for 1 hour, at 90°C for 30 minutes, at 110°C for 15 minutes...

Embodiment 2

[0030] (1) Add 24 mL of absolute ethanol and 16 mL of ethyl acetoacetate to a dry anhydrous beaker, slowly add 20 mL of zirconium n-propoxide under stirring conditions, and stir at room temperature for about 30 minutes to prepare a zirconium sol;

[0031] (2) With 56mL absolute ethanol as solvent, add 5mM salicylaldehyde, after stirring evenly, add 26ml deionized water, add 52mL silane coupling agent under stirring condition, after stirring for 30 minutes, you can get the corrosion monitoring substance Silica sol;

[0032] (3) Mix the two sols prepared in steps (1) and (2) under stirring conditions, and adjust the pH to 4 with nitric acid;

[0033] (4) The aluminum alloy sample is coated for the first time using the dipping and pulling method, and after standing in the air for 15 minutes, the secondary coating is carried out, and the air is left standing for 30 minutes;

[0034] (5) Heat the coating sample obtained in (4) at 60°C for 1 hour, at 90°C for 30 minutes, at 110°C f...

Embodiment 3

[0036] (1) Add 15 mL of absolute ethanol and 10 mL of ethyl acetoacetate to a dry anhydrous beaker, slowly add 10 mL of zirconium n-propoxide under stirring conditions, and stir at room temperature for about 30 minutes to prepare a zirconium sol;

[0037] (2) Use 60mL of absolute ethanol as a solvent, add 10mM salicylaldehyde, stir evenly, add 26ml of deionized water, add 60mL of silane coupling agent under stirring conditions, and stir for 30 minutes to obtain the corrosion monitoring substance. Silica sol;

[0038] (3) Mix the two sols prepared in steps (1) and (2) under stirring conditions, and adjust the pH to 4.5 with nitric acid;

[0039] (4) The aluminum alloy sample is coated for the first time using the dipping and pulling method, and after standing in the air for 15 minutes, the secondary coating is carried out, and the air is left standing for 30 minutes;

[0040] (5) Heat the coating sample obtained in (4) at 60°C for 1 hour, at 90°C for 30 minutes, at 110°C for 1...

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Abstract

The invention discloses a preparation method of a sol-gel coating with a corrosion monitoring function. The method is characterized in that zirconium n-propoxide is used as a precursor, absolute ethylalcohol is as a solvent, ethyl acetoacetate is used as a complexing agent, and on that basis, zirconia sol is prepared; a silane coupling agent is used as a precursor, deionized water and absolute ethyl alcohol are used as solvents, and salicylaldehyde is used as a corrosion monitoring substance, and on that basis, an additive-containing silica sol is prepared; the two gel solutions are mixed, and a salpeter solution is added to regulate the pH value and obtain hybrid sol; after the aluminum alloy is pre-treated, the pre-treated aluminum alloy is dipped into the hybrid sol to be coated with afilm by a dipping pulling method; and the aluminum alloy coated with the film is subjected to multiple thermal treatment in an oven under the temperature of 60 DEG C, 90 DEG C and 110 DEG C, and thusthe transparent hybrid sol-gel film coating with the corrosion monitoring function can be obtained. According to the method, salicylaldehyde is used as a fluorescent agent, and a proper sol solutionformula is supplied, and thus the adding concentration of salicylaldehyde is within a wide range, so that the adding concentration of salicylaldehyde can be adjusted as required.

Description

technical field [0001] The invention relates to a preparation method of a sol-gel coating with a corrosion monitoring function, in particular to a preparation method of a sol-gel coating capable of realizing the corrosion monitoring function of aluminum alloys in a corrosive environment, and belongs to the field of functional protective coating materials . Background technique [0002] In a corrosive environment, aluminum alloys will corrode, so various corrosion protection methods are often used to protect them. Common corrosion protection technologies include electroplating, anodic oxidation, and coating technology. Sol-gel coating has the characteristics of significantly enhancing the adhesion of the paint film and being green and non-polluting, and is often used for the protection of aluminum alloys. For sol-gel coatings, the appropriate alcohol-to-water ratio and the ratio of organic and inorganic components are very important for the performance of the coating, such a...

Claims

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Application Information

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IPC IPC(8): C09D5/22C09D1/00
CPCC09D5/22C09D1/00
Inventor 于美熊亮亮佟家兴刘建华李松梅
Owner BEIHANG UNIV
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