Preparation method of ultra-black coating with nano-pore structure

A nanoporous structure, black coating technology, applied in coating, metal material coating process, liquid chemical plating and other directions, to achieve the effects of good light absorption, reduced reflectivity, and good light absorption

Inactive Publication Date: 2013-09-04
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the constraints of the preparation method, the porous Ni-P alloy coating currently has the characteristics of conical hole morphology, and the surface pore size belongs to the micron size category.

Method used

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  • Preparation method of ultra-black coating with nano-pore structure
  • Preparation method of ultra-black coating with nano-pore structure
  • Preparation method of ultra-black coating with nano-pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use a mixture of 15g / L sodium hydroxide, 40g / L trisodium phosphate and 30g / L sodium carbonate at 40°C to degrease the No. 20 steel substrate (10×10×1.5mm) for 10 minutes, wash with water; then Etch with 5% hydrochloric acid for 2 minutes, wash with water; then put the steel substrate into the electroless plating solution dispersed by ultrasonic vibration for 10 minutes, and plate at 75°C for 3 hours, the pH of the plating solution is 4.5, and the chemical plating solution consists of nickel sulfate 30g / L, Sodium hypophosphite 22g / L, sodium acetate 15g / L, lactic acid 30g / L, carbon black 1.5g / L, solvent is deionized water, carbon black particle size is 20-60nm, wash with water immediately after plating is completed, Dry to obtain a nickel-phosphorus-carbon alloy coating; finally use 6mol / L nitric acid solution to chemically etch the nickel-phosphorus-carbon alloy coating on the surface of the substrate for 90s, wash with water, and dry to obtain an ultra-black coating. fi...

Embodiment 2

[0033] Use a mixture of 40g / L sodium hydroxide, 30g / L trisodium phosphate and 20g / L sodium carbonate at 40°C to degrease the No. 45 steel substrate (20×20×3mm) for 20 minutes, wash with water; then use Etch with 30% hydrochloric acid for 0.5min, wash with water; then put the steel substrate into the electroless plating solution dispersed by ultrasonic vibration for 30min and apply plating at 82°C for 2h, the pH of the plating solution is 3, and the chemical plating solution consists of nickel sulfate 40g / L, Sodium hypophosphite 28g / L, acetic acid 20g / L, lactic acid 30g / L, carbon black 3g / L, the solvent is deionized water, and the particle size of carbon black is 20-60nm. After the plating is completed, it is washed with water immediately and dried. A nickel-phosphorus-carbon alloy coating was obtained; finally, the nickel-phosphorus-carbon alloy coating on the surface of the substrate was chemically etched for 40 seconds with 8 mol / L nitric acid solution, washed with water, and...

Embodiment 3

[0035]Soak the QAl7 aluminum bronze alloy substrate (20×20×3mm) in acetone at room temperature for degreasing for 30 minutes, then wash with water; then etch with 8% sulfuric acid for 1 minute at room temperature, and wash with water; Plating was carried out at 85°C for 1.5 h in the oscillating and dispersed electroless plating solution. The pH of the plating solution was 5.2. Carbon black is composed of 0.5g / L, the solvent is distilled water, and the particle size of carbon black is 20-60nm. After the plating is completed, it is washed with water immediately and dried to obtain a nickel-phosphorus-carbon alloy coating; The nickel-phosphorus-carbon alloy coating was chemically etched for 20s, washed with water, and dried to obtain an ultra-black coating.

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Abstract

The invention discloses a preparation method of an ultra-black coating with a nano-pore structure. The preparation method comprises the following steps of: cleaning and activating a metal matrix material, plating the cleaned and activated metal matrix material in a chemical plating solution to deposit a nickel phosphorus carbon alloy coating on the metal matrix material, wherein the chemical plating solution comprises nickel sulfate, sodium hypophosphite, a buffer agent, a complexing agent and a carbon black, and the particle size of the carbon black is 20-60mm, and chemically etching the nickel phosphorus carbon alloy coating on the surface of the metal matrix material using an etching acid solution. A plurality of nanometer conical pores different in sizes are uniformly distributed in the surface of the ultra-black coating prepared by the preparation method, nano-pores which are smaller in pore diameters are filled in the inner surfaces of the nanometer conical pores and in the plane areas between the adjacent conical pores, the light reflectivity of the ultra-black coating within a 400-2000 light wavelength range is less than 0.12%, and the ultra-black coating has light absorption performance better than that of the light absorbing coating obtained by carrying out conventional chemical etching on a Ni-P alloy.

Description

technical field [0001] The invention relates to a method for preparing an ultra-black coating with a nanopore structure, and belongs to the technical field of ultra-black light-absorbing coatings. [0002] Background technique [0003] Black coatings are widely used in solar energy conversion, thermal-optical-electric generation, infrared detection, microscope imaging, astronomical observation and other fields. For example, it is necessary to coat a layer of black paint on the outer surface of the inner tube of the vacuum glass tube in the solar water heater to improve the absorption rate of sunlight. The inner wall of the lens barrel of various optical instruments needs to be painted black to improve the absorption of light irradiated on the inner wall, reduce the reflection of light on the inner wall, reduce the interference of light reflected from the inner wall on imaging, and improve the clarity of imaging . [0004] Generally, the surface of solid materials (such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23F1/28
Inventor 金永中杨奎胡旭东严弘扬岳盼盼曾国庆
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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