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Chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and preparation method thereof

An aluminum-doped zinc oxide, composite coating technology, applied in the directions of chromium oxide/hydrate, chromium trioxide, chemical instruments and methods, etc., can solve the problems of uneven particle distribution, uneven thermal performance, poor bonding force, etc. , to achieve uniform composition, improve high temperature corrosion resistance, and high density.

Pending Publication Date: 2022-01-28
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of blending ball milling usually brings problems of uneven particle distribution, poor binding force, low density, and uneven thermal properties.

Method used

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  • Chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and preparation method thereof
  • Chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and preparation method thereof
  • Chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The volume of mixed solution in step 1 is 1000mL, wherein Cr(NO 3 ) 3 9H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mass fraction of O is 30wt.%, and the molar ratio of Cr 3+ : Zn 2+ 1:1, Zn 2+ :Al 3+ 40:1;

[0043] Step 2, gradually add excess ammonia water to the mixed solution in step 1 and keep stirring until the generated Cr(OH) 3 , Zn(OH) 2 and Al(OH) 3 The mixed white precipitate, the concentration of ammonia water is 30%.

[0044] Step 3, add a certain amount of PVA aqueous solution to the white precipitate obtained in step 2, the concentration of the PVA aqueous solution is 5%, and the addition amount is 150mL.

[0045] In step 4, the mixture in step 3 is placed on a roller ball mill for ball milling, the speed of the roller ball mill is 70r / min, and the working time is 24h.

[0046] Step 5, granulate the ball-milled slurry in step 4 on a spray granulator, and obtain dry Cr(OH) after removing moisture 3 , Zn(OH) 2 and Al(OH) 3 The sphe...

Embodiment 2

[0050] The volume of mixed solution in step 1 is 1000mL, wherein Cr(NO 3 ) 3 9H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mass fraction of O is 20wt.%%, and the molar ratio of Cr 3+ : Zn 2+ 1:4, Zn 2+ :Al 3+ 25:1;

[0051] Step 2, gradually add excess ammonia water to the mixed solution in step 1 and keep stirring until the generated Cr(OH) 3 , Zn(OH) 2 and Al(OH) 3 The mixed white precipitate, the concentration of ammonia water is 50%.

[0052] Step 3, add a certain amount of PVA aqueous solution to the white precipitate obtained in step 2, the concentration of the PVA aqueous solution is 8%, and the addition amount is 200mL.

[0053] In step 4, the mixture in step 3 is placed on a roller ball mill for ball milling, the speed of the roller ball mill is 80r / min, and the working time is 24h.

[0054] Step 5, granulate the ball-milled slurry in step 4 on a spray granulator, and obtain dry Cr(OH) after removing moisture 3 , Zn(OH) 2 and Al(OH) 3 The sph...

Embodiment 3

[0058] The volume of mixed solution in step 1 is 1000mL, wherein Cr(NO 3 ) 3 9H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mass fraction of O is 20wt.%~50wt.%, and the molar ratio of Cr 3+ : Zn 2+ 1:3, Zn 2+ :Al 3+ 19:1;

[0059] Step 2, gradually add excess ammonia water to the mixed solution in step 1 and keep stirring until the generated Cr(OH) 3 , Zn(OH) 2 and Al(OH) 3 The mixed white precipitate, the concentration of ammonia water is 35%.

[0060] Step 3, add a certain amount of PVA aqueous solution to the white precipitate obtained in step 2, the concentration of the PVA aqueous solution is 5-8%, and the addition amount is 200mL.

[0061] In step 4, the mixture in step 3 is placed on a roller ball mill for ball milling, the speed of the roller ball mill is 60r / min, and the working time is 24-36h.

[0062] Step 5, granulate the ball-milled slurry in step 4 on a spray granulator, and obtain dry Cr(OH) after removing moisture 3 , Zn(OH) 2 and Al(OH)...

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Abstract

The invention discloses a chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and a preparation method thereof. The preparation method comprises the following steps of: 1, preparing a mixed solution according to a set proportion; 2, dropwise adding excessive ammonia water into the mixed solution step by step, and continuously stirring until a mixed white precipitate is generated; 3, adding a PVA (Polyvinyl Alcohol) aqueous solution into the obtained white precipitate; 4, putting the mixture on a roller type ball mill for ball milling; 5, granulating the ball-milled slurry on a spray granulator, and removing moisture to obtain spherical mixed powder; 6, calcining the obtained spherical mixed powder in a vacuum high-temperature environment, and decomposing to obtain spherical feed of Cr2O3 and AZO; and 7, putting the prepared spherical feed in a powder feeder, and preparing a Cr2O3 / AZO anti-corrosion composite coating on a metal plate in an atmosphere plasma spraying mode. The conductivity of the ZnO material is improved in an Al doping manner, so that the corrosion resistance of the coating is improved.

Description

technical field [0001] The invention belongs to the field of preparation of advanced ceramic coatings, in particular to a chromium oxide-aluminum doped zinc oxide anti-corrosion composite coating and a preparation method thereof. Background technique [0002] Ceramic anti-corrosion coatings can protect metal substrates from corrosion in harsh environments such as high-temperature corrosion and improve the service life of metal components. They are widely used in oil and gas industry pipeline anti-corrosion, offshore equipment anti-corrosion and transportation equipment anti-corrosion and other fields. [0003] ZnO ceramic coating has become an important material for high-temperature anti-corrosion ceramic coatings due to its low resistance characteristics and anaerobic properties. However, due to its own limitations, such as poor wear resistance and corrosion resistance, ZnO materials still need to be improved, which greatly limits the practical application range of ZnO coat...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/10C01G37/033C01G9/00
CPCC23C4/134C23C4/10C01G37/033C01G9/00C01P2004/80C01P2004/32C01P2004/03C01P2002/72
Inventor 崔锦文王弘喆崔雄华张磊曹海涛杨哲一
Owner XIAN THERMAL POWER RES INST CO LTD
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