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Method for preparing high-bonding strength catbon steel based Al2O3 ceramic coating with colloidal sol-gel rubber

A combination of strength and ceramic coating technology, applied in coating, metal material coating process, superimposed layer plating, etc., can solve the problems of high cost, expensive laser processing equipment, and high requirements for ceramic oxide types, etc., to achieve The effect of good compactness, uniform composition and simple process

Inactive Publication Date: 2008-09-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It was reported that by combining laser-assisted processing with sol-gel technology, Cr 2 o 3 and SiO 2 The powder is mixed with silica sol and coated on the metal so that it forms SiC and M 7 C 3 In order to improve the bonding strength and surface hardness; but the laser processing equipment is expensive, the cost is high, and the requirements for the shape and size of the workpiece and the type of ceramic oxide are high

Method used

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  • Method for preparing high-bonding strength catbon steel based Al2O3 ceramic coating with colloidal sol-gel rubber
  • Method for preparing high-bonding strength catbon steel based Al2O3 ceramic coating with colloidal sol-gel rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare an Al2O3 ceramic coating with good film-base bonding strength on the surface of No. 20 steel, the process:

[0020] Electroless Ni-P alloy intermediate transition layer process:

[0021] Test process: The sample is subjected to pre-plating pretreatment such as grinding, polishing, cleaning, etc. → electroless nickel plating → hot water washing → water washing → drying under vacuum at 180°C for 1 hour.

[0022] Plating solution composition: nickel sulfate: 25g / L; sodium hypophosphite: 23g / L; sodium citrate: 8g / L and sodium acetate: 15g / L.

[0023] Process conditions: temperature: 85°C; pH value of plating solution: 4.0; plating time: 1-2h;

[0024] Coating Al on the surface of electroless Ni-P coating by sol-gel method 2 o 3 Ceramic coating process:

[0025] Aluminum isopropoxide is selected as the precursor, secondary deionized water is used as the solvent, nitric acid is used as the peptizer, and the molar ratio is 1:80:0.1. Firstly, finely ground aluminum ...

Embodiment 2

[0030] Preparation of Al2O3 ceramic coating with good film-base bonding strength on the surface of No. 45 steel:

[0031] Electroless Ni-P alloy intermediate transition layer process:

[0032] Test process: Clean and pretreat the surface of the sample → electroless nickel plating → cleaning → dry under vacuum at 190°C for 1 hour.

[0033] Plating solution composition: nickel sulfate: 26g / L; sodium hypophosphite: 24g / L; sodium citrate: 10g / L and sodium acetate: 16g / L.

[0034] Process conditions: temperature: 87°C; pH value of plating solution: 5.0; plating time: 1.5h.

[0035] Coating Al on the surface of electroless Ni-P coating by sol-gel method 2 o 3 Ceramic coating process:

[0036] Aluminum isopropoxide is selected as the precursor, secondary deionized water is used as the solvent, nitric acid is used as the peptizer, and the molar ratio is 1:100:0.2. Firstly, finely ground aluminum isopropoxide and deionized water are mixed. After vigorously stirring for 1 hour at a...

Embodiment 3

[0041] Preparation of Al with good film-substrate bonding strength on the surface of No. 60 steel 2 o 3 Ceramic coating:

[0042] Electroless Ni-P alloy intermediate transition layer process:

[0043] Test process: Clean and pretreat the surface of the sample → electroless nickel plating → cleaning → dry under vacuum at 200°C for 1 hour.

[0044] Plating solution composition: nickel sulfate: 28g / L; sodium hypophosphite: 25g / L; sodium citrate: 12g / L and sodium acetate: 18g / L.

[0045] Process conditions: temperature: 90°C; pH value of plating solution: 6.0; plating time: 1.5h.

[0046] Coating Al on the surface of electroless Ni-P coating by sol-gel method 2 o 3 Ceramic coating process:

[0047] Aluminum isopropoxide is selected as the precursor, secondary deionized water is used as the solvent, nitric acid is used as the peptizer, and the molar ratio is 1:120:0.3. Firstly, finely ground aluminum isopropoxide and deionized water are mixed. After vigorous stirring at a wa...

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Abstract

The invention discloses a method for preparing high bonding intensity carbon steel-based Al2O3 ceramic coat by sol-gel. The method adopts the carbon steel as a compound coating basic body, adopts nickel vitriol as main salt, adopts NaH2PO2 as a reducer to chemically plate a Ni-P alloy in an acid medium, takes aluminium isopropoxide as a precursor, takes secondary de-ionized water as a solvent and takes nitric acid as a glue solvent to prepare boehmite sol acordign to a mol ratio of 1:80 to 120: 0.1 to 03; adopts a dip-coating method to coat and then bake the gel. The invention takes a chemically plated Ni-P alloy as a middle transition layer and adopts the sol-gel method to prepare the Al2O3 ceramic coat on the surface of the carbon steel, thus solving the technical difficulty of the lower bonding force of the carbon steel-based ceramic coat. The compound processing method provided by the invention has a simple and convenient technique and needs no expensive and complex devices; besides, the prepared compound coat has excellent compactness and uniform components. The technique can be used for carbon steel anti-high temperature oxidation coat; the technique of the method is easy to realize industrialization and is not restrained by the shape of a workpiece.

Description

technical field [0001] The invention relates to the field of metal surface modification, in particular to a sol-gel technique for preparing carbon steel-based Al with high bonding strength 2 o 3 Ceramic coating method. Background technique [0002] Surface modification technology can improve the surface properties of metal materials, prevent or delay the failure of workpieces, and prolong the service life of workpieces and equipment, which has huge economic benefits. Ceramic materials have high hardness, good wear resistance, corrosion resistance and high temperature oxidation resistance. The preparation of ceramic coatings on metal surfaces can combine the above advantages of ceramic materials with the advantages of high plasticity and toughness of metal materials to obtain workpieces with good comprehensive properties. At present, the steel-based ceramic coating preparation techniques include powder metallurgy, plasma spraying, laser cladding, vapor deposition, enamel co...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C18/36C23C18/18C23C26/00C04B35/10
Inventor 郦剑罗来马
Owner ZHEJIANG UNIV
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