Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
  • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
  • C07D233/66—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D233/91—Nitro radicals
  • C07D233/92—Nitro radicals attached in position 4 or 5
  • C07D233/94—Nitro radicals attached in position 4 or 5 with hydrocarbon radicals, substituted by oxygen or sulfur atoms, attached to other ring members
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23K—FODDER
  • A23K20/00—Accessory food factors for animal feeding-stuffs
  • A23K20/10—Organic substances
  • A23K20/116—Heterocyclic compounds
  • A23K20/137—Heterocyclic compounds containing two hetero atoms, of which at least one is nitrogen

Definitions

• This invention relates to a process for coloring the surface of aluminum or aluminum alloys, and more particularly to such a process employing a variety of types of electrical currents and one or more metal salt solutions.
• Aluminum and aluminum alloys having colored surfaces have recently come into extensive use, for example as automobile fixtures, building materials, appliances and the like.
• the coloring of the surfaces must be color fast, uniform and available in different colors in order to be of extensive use.
• the electrolysis of the Asada method comprises two steps, first, a primary electrolysis using only direct current in the anodic oxidation step, and second, a secondary electrolysis using only alternating current in the coloring step.
• An object of this invention is to provide a new, simple, and inexpensive process for coloring surfaces of aluminum or aluminum based alloys, which are color fast and stable.
• An aluminum based surface i.e. a metal comprising aluminum or aluminum alloys
• An electric current of suitable current density comprising components of alternating current and direct current is used.
• the present invention includes the use of an incompletely rectified current. The current may be in a ratio such that the AC component is more than the DC component.
• the aluminum or its alloys is subjected to anodic oxidation in an aqueous solution comprising mainly sulfuric acid as the electrolyte, by using an electric current comprising both AC and DC components with the AC component being more than the DC component, then the resulting anodized film is dipped in a solution containing only metal salt without supplying electric current, and then sealed to obtain a colored aluminum.
• An outstanding advantage in the present invention lies in the fact that the anodic oxidation is carried out by supplying electric current comprising both AC and DC components, in an electrolyte containing mainly sulfuric acid, and that in the coloring step the supply of electric current is not necessary as compared with the above discussed Asada method.
• the electric current comprising both AC and DC components, in which the AC component is greater is supplied through the aqueous solution of sulfuric acid in the anodic oxidation, to form hydrogen sulfide in micropores of the anodized film by a reduction decomposition of sulfuric acid.
• the current density value of the applied current depends upon the reaction conditions of the anodization step, such as for example, temperature, concentration of electrolyte, period of reaction, etc. Accordingly, no particular value is assigned to the current density.
• the component of direct current should not be so high as to make the coloring difficult, nor should the component of direct current be so low as to produce anodized surfaces or films which are soft.
• excessive direct current component would tend to make coloring difficult, but an insufficient amount of DC component would produce a soft surface.
• a preferred range of values of AC and DC components may be specified by the ratio:
• the resulting anodized film or surface is then submersed or dipped into a single solution containing one or more metal salts.
• metal salt organic or inorganic
• such salts may be ferric ammonium oxalate, cobalt acetate, copper sulfate, cadmium sulfate, silver nitrate, nickel chloride and the like.
• concentration of metal salts in the solution is preferably within the range of from 0.1 to 10 per. cent by weight (hereinafter being the same), with a range of from 0.5 to 2.0 percent being es ecially preferred.
• the treated anodized surface is then subjected to a sealing treatment which may comprise the application of steam on to the surface for a period of time ranging from 30 to 60 minutes. This causes the color to come out and the surface to become sealed.
• a sealing treatment which may comprise the application of steam on to the surface for a period of time ranging from 30 to 60 minutes. This causes the color to come out and the surface to become sealed.
• the density of the AC as used in the following Examples, and also as defined by Japanese industry, is defined to be:
• ninuui to ho truubvtl current having a current density of 1.2 X 2 Amp/dm and direct current having a current density of 0.8 Amp/dm
• the anodization was carried out at a temperature of about 20 C or room temperature, for about 70 minutes.
• the samples having anodized surfaces were then treated under specific conditions listed in the below table 1, and with the following steps: (1) The anodized sample was washed with water, (2) Next, the sample was neutralized under a variety of conditions differing for each sample. (3) The neutralized sample was then again washed with water. (4) Next, the sample was dipped in a metal salt solution under a variety of condidried. (7) Thereafter, the sample was subjected to steam sealing to develop the color and to seal the surface.
• the sealing was obtained by subjecting the dipped surface I to high pressure steam of 3.5 l(g./cm. pressure, for about 30 minutes to perfect the coloring. 20 minutes. i
• a number of samples of aluminum alloys 25 were subjected Process, cglormg 1 Surface of an alummum based to anodization in a sulfuric acid electrolyte containing about 30 metal e i I l l 168 g/l of H 80, and 5.5 g./l. of A1, at a temperature of about mo l zmg ace an e ectro comammg i? y 20 C., for a period of time of about 60 minutes.
• the anodized samples were then treated according to the DC Component steps outlined in Example 1, and under the conditions listed in the following Table 2.
• EXAMPLE 3 shown in the following Table 3, in a sulfuric acid electrolyte 70 taining at least one metal salt, the concentration of said metal salt in said solution being within the range of from 0.1 percent by weight to 10 percent by weight; and
• said solution comprises a combination of metal salts selected from the group consisting of (1) copper acetate-nickel chloride, (2) nickel chloride-zinc chloride, and (3) cobalt acetate-copper sulfate.
• Nora-A0 component in the above Sample 1 is deviated from the specified range. of the. present invention.
• DC Component b dipping the resulting anodized surface in a solution containing a combination of metal salts selected from the group consisting of (1) copper acetate-nickel chloride, (2) nickel chloride-zinc chloride, and (3) cobalt acetatecopper sulfate, the concentration of said metal salts in

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Polymers & Plastics (AREA)
• Animal Husbandry (AREA)
• Zoology (AREA)
• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Plural Heterocyclic Compounds (AREA)
• Chemical Treatment Of Metals (AREA)

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Citations (4)

• 1966
  • 1966-07-18 DE DE19661521941 patent/DE1521941A1/de active Pending
• 1968
  • 1968-12-30 CH CH1940568A patent/CH507378A/de not_active IP Right Cessation
• 1969
  • 1969-09-05 US US855769A patent/US3661729A/en not_active Expired - Lifetime
  • 1969-09-05 US US855765A patent/US3646027A/en not_active Expired - Lifetime
• 1971
  • 1971-11-12 US US00198432A patent/US3790592A/en not_active Expired - Lifetime

Patent Citations (4)

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