Composite material coating having selective absorption function
A composite material and selective technology, applied in the direction of iron compound, chromium oxide/hydrate, inorganic chemistry, etc., to achieve the effect of structural stability
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Embodiment 1
[0016] The components and weight percentages of this embodiment are: Cr (38.9%), Ni (7.6%), O (23.9%), and the balance is Fe. The coating is realized by the following scheme: the alloy sheet (composition: Cr: 12% to 18%; Ni: 6% to 10%; the balance is Fe, including stainless steel but not limited to stainless steel) as the working electrode, graphite The plate is a counter electrode, an etching solution composed of chromic acid (2.2mol / L) and sulfuric acid (5.5mol / L), and the temperature is 60±1°C. Apply a pulse voltage to the system, the pulse width ratio of positive and negative voltage is 1:3, and the current density is controlled at 20mA / cm 2 ~30mA / cm 2 , corrosion time is 30min. After completion, rinse with deionized water and dry in an oven at 60°C.
[0017] The surface morphology of the coating was observed under an atomic force microscope (such as figure 1 shown), the surface of the coating is composed of a relatively regular array of cones, the height of the cones ...
Embodiment 2
[0022] The components and weight percentages of this embodiment are: Cr (11.8%), Ni (3.4%), O (3.9%), and the balance is Fe. For the preparation method of the coating, refer to Example 1, the temperature of the corrosion solution is 30±1°C, and the current density is controlled at 15mA / cm 2 ~20mA / cm 2 , the corrosion time is 25min, and all the other steps are the same as in Example 1.
[0023] The surface structure of the coating is composed of pyramid-like arrangement of pyramids, the height of the pyramids is 50-100nm, and the center-to-center distance of the bottom surface is 100-150nm.
[0024] The metal composite composite that makes up the coating consists of Cr 2 o 3 , Fe 2 o 3 and NiFe 2 o 4 Composed of three substances.
[0025] Taking the AM1.5 solar radiation spectrum as a reference, the absorptivity of the coating is measured to be 0.905, and the emissivity (20°C) is 0.079. After annealing at 300°C in air for 24 hours, the surface color has no obvious chan...
Embodiment 3
[0027] The components and weight percentages of this embodiment are: Cr (22.6%), Ni (6.4%), O (18.6%), and the rest is Fe. For the preparation method of the coating, refer to Example 1, the temperature of the corrosion solution is 50±1°C, and the current density is controlled at 20mA / cm 2 ~25mA / cm 2 , the corrosion time is 20min, and all the other steps are the same as in Example 1.
[0028] The surface structure of the coating is composed of a pyramid-like arrangement of pyramids, the height of the pyramids is 50-100nm, and the center-to-center distance of the bottom surface is 150-200nm.
[0029] The metal composites that make up the coating consist of Cr 2 o 3 , Fe 2 o 3 and NiFe 2 o 4 Composed of three substances.
[0030] Taking the AM1.5 solar radiation spectrum as a reference, the absorptivity of the coating is measured to be 0.921, and the emissivity (20°C) is 0.132. After annealing at 300℃ in air for 100 hours, the absorption / emission ratio (20℃) of the coati...
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