A method for preparing zirconium/selenium composite conversion film on the surface of aluminum alloy

A technology of aluminum alloy surface and conversion coating, applied in the direction of metal material coating process, etc., can solve the problems such as the need to improve the coating equipment and the process flow, the unsatisfactory corrosion resistance, the high cost of the passivation solution, etc. It is convenient for daily maintenance, meets the effects of corrosion resistance and easy control of process parameters

Active Publication Date: 2018-04-03
YANSHAN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems at present are: the stability of sol; the compounding of sol components; the coating method, coating equipment and process of sol-gel need to be improved
However, its corrosion resistance is still lower than that of chromate film, and it is almost colorless and difficult to distinguish, which brings certain difficulties to industrial operations.
[0006] These existing aluminum and aluminum alloy chromium-free passivation methods always have some deficiencies, for example: the corrosion resistance cannot meet the needs of actual production and life, the passivation effect is not good, and the cost of passivation solution is high, which is not conducive to large-scale production production etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing zirconium/selenium composite conversion film on the surface of aluminum alloy
  • A method for preparing zirconium/selenium composite conversion film on the surface of aluminum alloy
  • A method for preparing zirconium/selenium composite conversion film on the surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 20mmX10mmX3mm; place the pre-ground aluminum alloy in an alkaline degreasing solution at a temperature of 50°C Carry out the degreasing operation for 10 minutes; the composition of the alkaline degreasing solution is 5g of sodium silicate, 10g of sodium hydroxide, 10g of sodium carbonate per liter, and the rest is deionized water; the degreasing aluminum alloy is placed at a temperature of 25°C Activated in the activation solution for 30s, the activation solution is 20ml per liter of hydrofluoric acid solution, 20ml of hydrochloric acid solution; 0.1g, sodium fluoride 10g, magnesium sulfate 15g, and the balance is the ratio of deionized water. Mix the above-mentioned substances, stir until uniform in a corrosion-resistant container, and then filter to obtain the film-forming liquid. The pH of the film solution is 5.0; place the pretreated aluminum alloy i...

Embodiment 2

[0043] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 15mmX10mmX5mm; place the pre-ground aluminum alloy in an alkaline degreasing solution at a temperature of 35°C Carry out the degreasing operation for 10 minutes; the composition of the alkaline degreasing solution is 4g of sodium silicate, 15g of sodium hydroxide, 15g of sodium carbonate per liter, and the rest is deionized water; the aluminum alloy after degreasing is placed at a temperature of 30°C Activated in the activation solution of 25s, described activation solution is every liter of hydrofluoric acid solution 30ml, hydrochloric acid solution 25ml; Contains sodium zirconate 5g, selenium trioxide 10g, carboxylic acid 0.1g, Potassium fluoride 0.1g, ferric sulfate 15g, the balance is the proportion of deionized water, mix the above-mentioned substances, stir until uniform in a corrosion-resistant container, and then filter to obtain the film-forming l...

Embodiment 3

[0045] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 20mmX15mmX3mm; place the pre-grinded aluminum alloy in an alkaline degreasing solution at a temperature of 35°C Carry out the degreasing operation for 12 minutes; the composition of the alkaline degreasing solution is 10 g of sodium silicate, 11 g of sodium hydroxide, 13 g of sodium carbonate per liter, and the rest is deionized water; the degreasing aluminum alloy is placed at a temperature of 35 ° C Activated in the activation solution for 30s, the activation solution is 50ml per liter of hydrofluoric acid solution, 35ml of hydrochloric acid solution; 0.1g, sodium fluoride and potassium fluoride are mixed at 1:1, a total of 0.1g is mixed, copper sulfate is 0.1g, and the balance is the proportion of deionized water. Mix the above substances, and stir them in a corrosion-resistant container until uniform After that, filter to obtain the film-forming solut...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing a zirconium-selenium composite conversion film on the surface of aluminum alloy. The method is mainly characterized by comprising the steps of preparing film formation liquid, wherein each liter of film formation liquid is composed of 0.1-5 g of zirconate, 0.1-10 g of selenium type oxide or selenate, 0.1-15 g of organic acid, 0.1-10 g of auxiliary oxidizing agents, 0.1-15 g of film formation accelerants and the balance deionized water; carrying out degreasing treatment and activating treatment on the pre-ground aluminum alloy, placing the aluminum alloy into the film formation liquid with the temperature ranging from 10 DEG C to 60 DEG C for conversion treatment for 5-30 minutes, then taking out the aluminum alloy, washing the aluminum alloy through distilled water, air-drying the aluminum alloy and finally obtaining the zirconium-selenium colorful composite conversion film on the surface of aluminum alloy. The method has the advantages that the operation is simple, the cost is low, the composite conversion film high in uniformity and excellent in compactness can be formed, the corrosion resistance of the aluminum alloy is improved, the environmental friendliness is high, and production is easy.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to a method for preparing a conversion film on the surface of an aluminum alloy. Background technique [0002] Aluminum and aluminum alloys are more and more widely used in various fields of the national economy, especially higher requirements for surface decoration and corrosion resistance. The oxide film of aluminum has a protective effect on the aluminum substrate, but the protective effect of the natural oxide of aluminum is very limited, the humidity and salt in the atmosphere will obviously accelerate the corrosion, and because the linear expansion coefficient of aluminum and its alloys is large, the metal activity Generally, the surface is treated by oxidation method. Chemical oxidation treatment is one of the surface oxidation treatment technologies for aluminum alloys. Currently, the chromate chemical oxidation process, which is widely used, has serious problems such as ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/68
CPCC23C22/34C23C22/68
Inventor 于升学于强邵光杰邢茜张鸣显
Owner YANSHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap