• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A dark-coloured, wave-length selective oxide film on aluminium is prepared thereby that the metal subsequent to a cleaning treatment is submerged into a bath consisting of an aqueous solution having pH 8.9 - 10.9 and at a temperature of from 20 to 100`C under conditions which result in an electrode potential of between -1.1 and -0.6 volt relative to a saturated calomel electrode. The said potential can advantageously be maintained by either addition of H<u2>uO<s2>s to the bath or by electric polarization. In a more specific embodiment of the process there is used an aqueous solution of 1-100 g NH<u4>uCl or (NH<u4>u)<u2>uSO<s4>S per liter solution with or without addition of aluminate ions Al0<u2>u<s->s or Ca<s++>s, the pH of the solution, if necessary, being adjusted to pH 9 by addition of NH<u3>u, NaOH, KOH, Ca(OH)<u2>u and that the content of silicon, chromium and phosphorus each is maintained under 10 ppm.
    公开号:SU1438616A3
    申请号:SU813315594
    申请日:1981-07-08
    公开日:1988-11-15
    发明作者:Видем Кетил
    申请人:Институт Фор Энергитекникк (Фирма)；
    IPC主号:
    专利说明:

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    Isobregnation refers to the anodizing of aluminum and its alloys to produce dark-colored oxide films that have an absorptive capacity for radiation of a certain wavelength.
    The aim of the invention is to provide the absorptivity of films in the wavelength range up to 1 µm.
    The anodizing process is carried out in a solution of ammonium sulfate or chloride with a concentration of 1-100 g / l and pH 8.9-10.9 at a current density of 3.5 mA / dm and an anode potential from -1.1 to -0.6 V relatively naschennogo calomel electrode, which support the regulation of electrically parameters or the addition of hydrogen peroxide to the electrolyte. The temperature of the electrolyte is maintained in the range of 20-100 ° C and the process is carried out for no more than 30 minutes. As a result of this treatment, an oxide film of black or brown color with a violet, blue or green tint, with a certain microstructure, causing its absorption capacity to radiation with a wavelength of less than} µm, forms on the aluminum surface.
    Example 1 Aluminum sheet (aluminum content is 99.5%) was first etched in 5% NaOH solution for 3 minutes. After that, they were washed with water and passivated for 1 min in a 2% solution of HNOj. Then the sheet was washed again and anodized in an electrolyte containing - 20 g / l, with a pH of 9.5, I obtained by adding a solution of ammonium aka. The sheet was polarized anodically to pro-tacial — 0.8 V relative to the saturated- scaled calomel electrode. Kato I House served as a stainless steel sheet,; The temperature was 40 ° C; at a current density of 3.5 mA / dm, which gradually decreased. Already through; 10 min aluminum sheet acquired a black and purple hue. Sheets processed for 20 minutes had a black and blue tint. When processing for more than 30 minutes, a slow brightening of the surface occurs, and therefore treatment is not recommended for more than 30 minutes. : The anodizing process is carried out in an I bath of polyethylene or various I plastics.
    I Example 2. A sheet of aluminum brand 57S etched as in example 1,
    After washing, the sheet was passivated in 2% HNO solution at room iTeMnepaType for at least 5 minutes. After washing, the sheet was placed in an electrolyte that contained .V. 20 g / l and 10 g / l HjOj and had a pH of 9.5, the pH was adjusted to the desired value by the addition of NaOH. The amount injected into the electrolyte determines the potential of the anode, which in this case was initially -0.8 V and lowered to –0.95 V in 10 minutes. Dp of preventing a decrease in potential, an additional amount was added to the electrolyte. After 1 o min, the treatment was completed, the sheet had a dark brown color.
    The bath temperature was. It is not recommended to lower the temperature below 20 ° C and increase it more, because in the first case the formation of the film proceeds too slowly, and in the second one does not receive additional advantages.
    Example 3. A sample of ultrapure aluminum was first subjected to electropolishing at 20 V in a 5% alcoholic solution of HCL at 15 ° C, and then washed in water. Anodization was carried out in a solution containing 65 g / l (NH4) 2804 with a pH of 10.3 at a temperature of 40 ° C, the required value of the anode potential was maintained by adding a 30% hydrogen peroxide solution. As a result, brown films were obtained.
    The films obtained in the above examples had an absorption maximum in the wavelength range up to I µm, which is shown in the drawing, where the reflectivity of the films is shown as a function of the radiation wavelength.
    The films obtained can be used in the manufacture of thermal solar panels and for decorative purposes.
    权利要求:
    Claims (1)
    [1]
    Image formula
    A method of anodizing aluminum to produce dark oxide films that have an absorptive capacity for radiation of a certain length i. Waves, which include treatment in salt solution with a pH of 8.9 - 10.9 at 20-100 ° C for no more than 30 minutes, characterized in that
    ensuring the absorptivity of films in the wavelength range up to 1 µm, the process is carried out at a current density of 3.5 mA / dm, the anode potential from -1.1 to -0.6 V relative to a saturated calomel electrode, which
    . . t I I I I I
    G.5 support by adjusting the electrical parameters or adding hydrogen peroxide to the bath, and using a sulfate solution or ammonium chloride with a concentration of 1-100 g / l as a salt solution.
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    类似技术:
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    同族专利:
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    SE448101B|1987-01-19|
    DK302981A|1981-07-08|
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    IT1134200B|1986-07-31|
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    引用文献:
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    US3905838A|1974-04-10|1975-09-16|Hikaru Ito|Bath for treating aluminum and aluminum alloys to form oxide film nonelectrolytically thereon and method for the treatment|
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    US3956082A|1974-10-24|1976-05-11|Kabushiki Kaisha Shokosha|Anodizing bath for composite metal material composed of aluminum or aluminum alloy and different metal having a lower ionization tendency|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NO793621A|NO146439C|1979-11-09|1979-11-09|PROCEDURE FOR THE PREPARATION OF A DARK COLOR, WAVE LENGTH SELECTIVE ALUMINUM OIL|
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