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Method for selective absorption treatment of alloy surface

A treatment method and selective technology, applied in optics, instruments, optical components, etc., can solve problems such as limited use, instability in high temperature areas, and decline in absorption rate, and achieve the effect of stable structure and strong corrosion resistance

Active Publication Date: 2013-03-20
AIDI ENVIRONMENT TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like other low-temperature coatings, the absorption rate of this coating drops sharply above 200 °C, which limits its use
U.S. Patent No. 4405414 mentions that a black coating prepared by a similar method can withstand 200°C in an air environment, and the absorptivity / emissivity (100°C) = 0.90 / 0.23, but the coating at 200°C The above high temperature zone is unstable and still cannot meet the requirements of working at medium and high temperatures

Method used

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  • Method for selective absorption treatment of alloy surface
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The substrate is 304L stainless steel (composition: 18.34% Cr, 8.04% Ni, 1.09% Mn, 0.56% Si, 0.045% C, 0.037% P, and the rest is Fe). The electrolyte consists of 2mol / L chromic acid and 5mol / L sulfuric acid. A stainless steel sheet was used as the working electrode, and a graphite sheet was used as the counter electrode. The electrolyte temperature was 50°C. The output waveform of the power supply is a square wave, the pulse width ratio of positive and negative potentials is 1:3, and the current density is 25mA~30mA / cm 2 , the reaction time is 15min; reduce the current density to 15mA~20mA / cm 2 , continue to react for 10 minutes. After the reaction is complete, rinse with deionized water and dry in an oven at 60°C.

[0022] The resulting coating consists of Cr 2 o 3 , Fe 2 o 3 , NiFe 2 o 4 Composition, the mass percent of each element in the coating is: 38.9% chromium element, 7.6% nickel element, 23.9% oxygen element, and the balance is iron.

[0023] The su...

Embodiment 2

[0027] The substrate is 304L stainless steel (composition: 18.34% Cr, 8.04% Ni, 1.09% Mn, 0.56% Si, 0.045% C, 0.037% P, and the rest is Fe). The electrolyte is composed of 22mol / L chromic acid and 5.5mol / L sulfuric acid. A stainless steel sheet was used as the working electrode, and a graphite sheet was used as the counter electrode. The electrolyte temperature was 30°C. The output waveform of the power supply is a square wave, the pulse width ratio of positive and negative potentials is 1:2, and the current density is 20mA~25mA / cm 2 , the reaction time is 20min; reduce the current density to 10mA~15mA / cm 2 , continue to react for 5 minutes. After the reaction is complete, rinse with deionized water and dry in an oven at 60°C.

[0028] The resulting coating consists of Cr 2 o 3 , Fe 2 o 3 , NiFe 2 o 4 Composition, the mass percentage of each element in the coating is: 22.3% chromium element, 5.6% nickel element, 14.1% oxygen element, and the balance is iron.

[0029...

Embodiment 3

[0032] The substrate is 316L stainless steel (composition: 16-18% Cr, 10-14% Ni, 2% Mn, 2-3% Mo, 0.75% Si, 0.03% C, 0.045% P, and the rest is Fe). The electrolyte consists of 15mol / L chromic acid and 5mol / L sulfuric acid. A stainless steel sheet was used as the working electrode, and a graphite sheet was used as the counter electrode. The electrolyte temperature was 60°C. The output waveform of the power supply is a square wave, the pulse width ratio of positive and negative potentials is 1:3, and the current density is 30mA~35mA / cm 2 , the reaction time is 20min; reduce the current density to 15mA~20mA / cm 2 , continue to react for 10 minutes. After the reaction is complete, rinse with deionized water and dry in an oven at 60°C.

[0033] The resulting coating consists of Cr 2 o 3 , Fe 2 o 3 , NiFe 2 o4 Composition, the mass percent of each element in the coating is: 32.4% chromium element, 6.6% nickel element, 18.0% oxygen element, and the balance is iron.

[0034] T...

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Abstract

The invention relates to a method for the selective absorption treatment of an alloy surface in the technical field of solar photothermal transfer. Through using an alloy steel plate as an anode and using a graphite plate as a pair electrode, pulse continuous corrosion is sequentially carried out to an electrolyte containing chromic acid and sulfuric acid under two current densities of 20-40 mA / cm<2> and 10-20 mA / cm<2> to realize the selective absorption treatment of an alloy surface. The coating prepared by the invention has favorable thermal stability and constant optical performance in the air environment of 100-300 DEG C. The preparation method is simple and rapid, has easily-controlled reaction conditions and is suitable for mass production.

Description

technical field [0001] The invention relates to a method in the technical field of solar photothermal conversion, in particular to a selective absorption treatment method on an alloy surface. Background technique [0002] Solar energy is one of the most important clean energy sources in this century, which can partially replace traditional fossil fuels and reduce energy shortage and environmental pressure. At present, the utilization of solar energy mainly includes two aspects: photoelectricity and photothermal conversion. Solar cells can directly convert the high-energy ultraviolet rays in sunlight into electrical energy, which is a relatively convenient way. However, due to the low share of ultraviolet rays in the total solar energy, about 5%-10%, it is not efficient from the perspective of solar energy utilization. Another major utilization method of solar energy is light-to-heat conversion, which converts more than 90% of solar energy into heat energy for various purpo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/06C22C38/58C22C38/44G02B1/10G02B1/14
Inventor 蔡伟民丁大伟
Owner AIDI ENVIRONMENT TECH SHANGHAI