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Hola. Soy miembro hace mucho tiempo pero no he podido entrar con mi anterior nombre de usuario asi que me registré nuevamente.
Si alguien me puede explicar el tema de como anodizar sobre cobre y como lograr posteriormente colores iridiscentes sobre las mismas piezas de cobre anodizado...supongo que serán pátinas.
He visto algunos trabajos realmente preciosos de objetos logrados con electrólisis de cobre primero y luego estos anodizados y los colores muy intensos.
Tengo alguna experiencia en electrólisis pero nunca he anodizado.
Desde ya muchas gracias.

El cobre no se puede anodizar, el oxido de cobre es pulvurento y poco resistente. El titanio, zirconio niobio y otros metales similares si se anodizan y el color les da bonitos colores, pero al cobre no.
Salud!!

Y por supuesto, el aluminio.

Es cierto, el aluminio se puede anodizar, pero para que adquiera un color hay que teñirlo. Los metales que he mencionado adquieren el color naturalmente por interferencias de la luz en función del espesor del oxido.
Salud!!

Gracias por las respuestas!!! Estoy reencontrándome con la electrodeposicion aplicada a joyería, y vi unas hojitas de cobre electro depositado preciosas con muchísimos colores , y me gustaría aplicar esa técnica al cobre. Alguien me dijo que no es pátina de galvanoplastia sino que es anodizado sobre cobre.
En caso que sea pátina de electrólisis...como puedo llegar a esas fórmulas con esos colores ?Cómo hacerlas? Sobre todo los fuxias y azules.
Les muestro una imagen, y si tienen alguna pauta para desarrollarlas se los agradezco un montón!!!!
[url]https://www.facebook.com/1541081201/posts/10220882044991169?d=n&sfns=mo

El enlace de facebok no funciona.
salud!!

He encontrado estas formulas para dar patinas al cobre, lo que no tine nada que ver con lo que conocemos como anodizado.
Salud!!

The Science Company has collected these recipes from a variety of sources through the years. The formulas have not been personally tested so there is no guarantee that they will work. We suggest they be employed on a "trial and error" basis first so their effectiveness can be judged by the user.
Cold Process = Cold solution, Cold metal, Cold rinse water.
Hot Process = Hot solution, Hot metal, Hot rinse water.
1. Light to Dark Brown
Ingredients
Ferric Nitrate... 1/2 tsp
Distilled Water... 1 pint
Process
Hot or cold process. (Red to reddish brown has also been reported using this recipe.)
2. Brown to Black
Ingredients
Sulfurated Potash grape sized lump (crushed).
Distilled Water... 1 pint
Process
Hot or cold process. Use fresh solution each time.
3. Blackish Brown
Ingredients
Ferric Nitrate... 2 oz
Distilled Water... 1 pint
Sulfurated Potash... 1/4 oz
Process
Hot or cold process. Mix in the order given.
4. Florentine Brown
Ingredients
Ferric Chloride... 1 tsp
Ferric Nitrate... 1/2 tsp
Distilled Water... 1 pint
Process
Hot or cold process. This old Italian formula produces a rich brown patina.

5. Antique Green
Ingredients
Ammonium Chloride... 1/3 oz
Cupric Sulfate... 3 oz
Distilled Water... 1 quart
Process
Hot process. Solution hot (180 to 190°F), metal hot (200°F), cold wash water applied after metal has cooled to around 100°F. Wash solution over metal surface, let dry, then wash piece in cool water. Repeat until color develops.

6. Basic Green
Ingredients
Cupric Nitrate... 1 tsp
Distilled Water... 1 pint
Process
Hot process, semi-transparent patina. Heat metal and apply a fresh mixture for each coloring.

7. Blue Green
Ingredients
Sodium Thiosulfate... 1/4 oz
Ferric Nitrate... 2 oz
Distilled Water... 1 quart
Process
Hot process. Solution hot (180 to 190°F), metal hot (200°F), cold wash water applied after metal has cooled to around 100°F. Wash solution over metal surface, let dry, then wash piece in cool water. Repeat until color develops. For Yellow Green, dip in dilute nitric acid, then wash and dry.

8. Cold Process Green
Ingredients
Cupric Nitrate... 40 gm
Ammonium Chloride... 40 gm
Calcium Chloride... 40 gm
Distilled Water to make 1 liter
Process
A cold process, opaque patina. Frog green results after several applications, 1/2 hour intervals. Color is not satisfactory alone. Combines well with most brown and black cold process patinas.

9. Light Green
Ingredients
Sodium Thiosulfate... 6-8 oz.
Ferric Nitrate... 2-3 oz.
Distilled Water ... 1 gal.
Process
Hot process. Solution and metal hot (140 to 160°F).

10. Green
Ingredients
Sodium Thiosulfate... 8 oz.
Lead Acetate... 1-3 oz.
Distilled Water... 1 gal.
Process
A cold process that is said to work well on brass.

11. Green - Blue (Flemish)
Ingredients
Sodium Thiosulfate... 8 oz.
Lead Acetate... 1-3 oz.
Distilled Water... 1 gal.
Process
Temperature at 170 to 190°F, a hot process especially for brass.

12. Purple to Light Green
Ingredients
Sodium Chloride... 5 parts
Ammonium Hydroxide... 4 parts
Process
Parts by weight. Early stages of this recipe produce purple. Additional applications and chemical action turn the metal light green.

13. Transparent Blue
Ingredients
Sodium Thiosulfate... 60 gm
Nitric Acid Concentrated... 4 gm
Distilled Water... 1 quart
Process
A transparent, dip process patina. A preservative such as paste wax or polyurethane is necessary. May produce a grey blue when tap water is used.

14. Blue
Ingredients
Sulfurated Potash... 15 gm
Ammonium Chloride... 200 gm
Distilled Water 1 quart
Process
Brush onto surface.

15. Straw Yellow
Ingredients
Ferric Nitrate... 1/2 tsp
Distilled Water... 1/2 pint
Process
Heat metal and apply hot liquid.

16. Golden Yellow
Ingredients
Sodium Thiosulfate... 1/4 oz
Ferric Nitrate... 2 oz
Distilled Water 1 quart
Process
Heat solution to a boil. Dip.

17. Deep Rust Red
Ingredients
Cupric Nitrate... 48 grains
Ammonium Chloride... 48 grains
Calcium Chloride... 20 grains
Cupric Sulfate... 10 grains
Oxalic Acid... 10 grains
Distilled Water... 4 oz
Nitric Acid 10%
Process
Brush to surface for color. Then dip into diluted (1 acid:8 water) Nitric acid for 1/2 hour, remove, wash and dry.

18. Purple
Ingredients
Sodium Chloride... 5 parts
Ammonium Hydroxide... 4 parts
Ammonium Chloride... 5 parts
Glacial Acetic Acid... 4 parts
Distilled Water... 32 parts
Process
Parts by weight. Brush to surface.

19. Antique White
Ingredients
Bismuth Nitrate... 2 tsp.
Distilled Water... 8 oz.
Process
Heat metal and apply liquid. Variations of this formula add a pinch of Sulfurated Potash, Ferric Nitrate, or Cupric Nitrate for a slight coloring effect.

Formulas Suggested for Specific Metals.
20. Red - semi-matt (for Copper & Copper Plate)
Ingredients
(A) Cupric Sulfate... 25 gm
Distilled Water... 1L
(B) Ammonium Chloride... 0.5 gm
Process
Boil immersion (A) 15 min.
Boil immersion (A)+(B) 10 min.
Immerse in boiling cupric sulfate solution about 15 min. or until color well developed.
Remove to hot water while ammonium chloride is added to the cupric sulfate solution. Then immerse about 10 min. Remove and wash in hot water. Dry and finish.
Important note: In general, chemically induced finishes are unsuitable for use on articles to be used with food.

21. Dull Pink (for Copper & Copper Plate)
Ingredients
Cupric Nitrate... 1 tsp
Nitric Acid 10% ... 100 ml
Distilled Water... 1L
Process
Hot immersion - 5 min.
Immerse in hot solution (140-158°F, 60-70°C) which etches surface. Remove after 5 min., wash in warm water and air dry. Wax finish.

22. Red-Purple Satin (For Cast Bronze and Brass)
Ingredients
Cupric Sulfate... 25 gm
Distilled Water... 1L
Process
Boiling immersion (10 to 30 min.)
Immerse in boiling solution. A reddish orange color begins after 2-3 min. and deepens with continued immersion. When a reddish-purple color is attained from 10 to 30 min. remove and wash well in hot water. Dry and wax finish if choose.

23. Orange-Brown (For Cast Bronze and Brass)
Ingredients
Cupric Acetate... 25 gm
Cupric Sulfate... 19 gm
Distilled Water... 1L
Process
Heat immersion (15 min)
Immerse in hot solution (176°F, 80°C). Color develops gradually and remove after 15 min. Wash and dry wax finish if choose.

24. Black - semi-gloss (For Cast Bronze and Brass)
Ingredients
Sodium Thiosulfate... 50 gm
Ferric Nitrate... 12.5 gm
Distilled Water... 1L
Process
Hot immersion (20 min.)
Immerse in hot solution (140-158°F, 60-70°C). In one minute the surface is colored blue-purple. This recedes to a brown color, then changing to gray. After 20 min., remove, washing in hot water and dry in air. Handle as little as possible.

25. Blue Green (For Cast Bronze and Brass)
Ingredients
Cupric Sulfate... 20 gm
Cupric Acetate... 20 gm
Ammonium Chloride... 10 gm
Acetic Acid (6% soln.)... to form a paste.
Process
Applied paste - several days.
Using a mortar and pestle, grind ingredients to a creamy paste with the acetic acid. Apply paste to object with a soft brush giving a thick coating. Dry for one day. Wash dry residue away under cold water using a soft brush. Apply a thin layer of paste with a soft cloth and dry again for one day. Wash off residue again. Apply thin layer and dry until good variegated patina is achieved. When treatment completed, dry thoroughly. May be waxed.

26. Golden Yellow (For Cast Bronze and Brass)
Ingredients
Cupric Sulfate... 50 gm
Ferrous Sulfate... 5 gm
Zinc Sulfate... 5 gm
Potassium Permanganate... 2.5 gm
Distilled Water... 1L
Process
Boiling immersion (15 min.)
Immerse object in boiling solution. A dark brown layer forms on surface after 1-2 min. Remove object and bristle-brush under hot water. Re-immerse and repeat process after 2 min. if necessary. Immerse again to approximately 15 min. remove and wash thoroughly in hot water using a bristle brush if necessary. Dry and wax finish of choice.

27. Blue Green - semi-matt (For Cast Bronze and Brass)
Ingredients
Cupric Acetate... 20 gm
Ammonium Chloride... 35 gm
Distilled Water... 1 L
Process
Applied liquid.
With mortar and pestle, grind ingredients with a little water. Then add to remaining water. Dab and wipe on sparingly with soft cloth, to leave an evenly moist surface. Allow to dry in air. Repeat procedure once a day for several days as color develops. Dry for several days during which time the patina develops further. When there is no more surface change, wax to finish.
The most important part is to let it dry throughly between applications and up to two weeks before waxing.

28. Brown - Greenish Yellow (For Cast Bronze and Brass)
Ingredients
Cupric Nitrate... 80 gm
Nitric Acid 10% ... 100 ml
Distilled Water... 1 L
Process
Immerse in hot solution (140-158°F, 60-70°C) to cause etching of the surface and gradual darkening. After 5 minutes remove and wash in warm water. Allow to air dry. When dry, wax finish.

29. Reddish Brown (For Cast Bronze and Brass)
Ingredients
Cupric Sulfate... 125 gm
Sodium Acetate... 12.5 gm
Distilled Water... 1 L
Process
Boiling immersion (10-15 min)
The color will develop after 10 - 15 min. Remove and wash in hot water. Dry thoroughly, wax finish.

30. Black (For Cast Bronze and Brass)
Ingredients
Sodium Thiosulfate... 6.25 gm
Ferric Nitrate... 50 gm
Distilled Water... 1 L
Process
Heat immersion - 1 minute.
When article is immersed in hot solution (120-140°F, 50-60°C) a succession of colors is produced. It changes to a purplish color after about 45 seconds. The color darkens quickly and the article is removed after about 1 minute. Wash thoroughly in hot water and air dry, wax finish.

31. Variegated Gold-Brown (For Cast Bronze and Brass)
Ingredients
Potassium Permanganate... 10 gm
Distilled Water... 1 L
Process
Hot immersion (3-5 min.)
Immerse in hot solution (194°F, 90°C). A golden lustre develops within one minute and becomes more intense. When lustre color is fully developed in 3 - 5 minutes, remove and wash in hot water, which is also a cooling process. Finally, wash article in cold water. Dry carefully first by blotting excess moisture with absorbant tissue paper and then air dry. Wax finish when dry.

32. Red (For Cast Bronze and Brass)
Ingredients
Cupric Nitrate... 8 oz
Oxalic Acid... 8 oz
Distilled Water... 1 gal
Process
Heat metal and apply hot liquid
More Formulas for Copper.
33. Verde
Ingredients
Cupric Sulfate... 8 parts by weight
Ammonium Chloride... 4 parts by weight
Sodium Chloride... 4 parts by weight
Zinc Chloride... 1 part by weight
Glacial Acetic Acid... 3 parts by weight
Water... 128 parts by weight
Process
A dip process patina, immerse object in solution for a few minutes, then remove. Repeat until a color appears. A preservative is optional. This patina is reported to produce more of a turquoise than a green. Color appears when removed from solution. Applying with a brush is an okay option.

34. Peacock Blue
Ingredients
Sodium Thiosulfate... 150g
Lead Acetate... 25g
Cream of Tartar... 30g
Water... 1 Liter
Process
An intense, dip process, transparent patina. Immerse object for 20 to 30 minutes. A preservaative should be applied immediately after the object is removed and dried.

35. Yellow Green
Ingredients
Ammonium Chloride... 7 parts by weight
Cupric Acetate... 4 parts by weight
Water... 8 parts by weight
Process
A cold process, heavy opaque patina that takes effect after several applications. Preservative is optional.

[quote="pfdc"]He encontrado estas formulas para dar patinas al cobre, lo que no tine nada que ver con lo que conocemos como anodizado.
Salud!!

[quote="pfdc"]He encontrado estas formulas para dar patinas al cobre, lo que no tine nada que ver con lo que conocemos como anodizado.
Salud!!

Estaba preparando unos hermosos ánodos de cobre y al venir a la compu me encuentro con este regalo!!!!! Muchas pero MUUUCHAS Gracias profesor!!!
Inmediatamente traduje con google....y me encuentro con diversos materiales a usar.... y la mayoria son para componer,....y no tengo idea como se hacen, y si bien no se usa el sistema de electrólisis, dan estas fórmulas pautas a seguir y probar y posiblemente crear nuevos tonos desde la experiencia.
Les agrego que segui las instrucciones del foro para subir fotos, espero que se suba esta vez

https://imagizer.imageshack.com/v2/640x480q90/921/lSLh1k.jpg

Respecto a alguno de los componentes para estas fórmulas si no es molestia y alguien me puede indicar como llegar a ellos ...seria buenisimo.Si quiero comprarlos venden minimo 1 litro o 1 kg!! No se estequiometria, y al buscar por internet dan mucha fórmula...pero no práctica que es muy importante para la realizacion, por ello, si no es molestia y alguien sabe ente nuestros foros si hay una guia para hacer practicas de fórmulas? por ejemplo el
1)Nitrato Cúprico , tengo sulfato de cobre y tambien óxido de cobre, como se hace el nitrato cuprico?
2) Potasa Sulfurada ...supongo que es Sulfato de Potasio...tengo Nitrato de Potasio y Cianuro de Potasio, como llego al Sulfato?
3) Tiosulfato de sodio Ni idea...que es y como se haace?
4) Acetato de plomo , tengo plomo sólido
5) Cloruro de Amonio , tengo Amoniaco puro...como hago el cloruro desde el amoniaco puro?
6) Hidróxido de Amonio, creo que es el amoniaco puRo con agua, si?
7) Ácido acético glacial, es lo mismo que el vinagre?
Cloruro de zinc ,Tengo oxido de zinc, es lo mismo? o como lo logro?
9) Ácido Oxálico supongo que es sal de limon...
10) Cloruro férrico y Nitrato férrico....pide ambos, que diferencia hay como se hacen?
11) Potasa de uva sulfurada
Quiero nuevamente agradecer al profesor por este aporte, y en cuanto logre algo se los muestro y explicarÉ como lo logro.
Saludos a todos!!!

Espero que esta se vea

Las formulas que he puesto anteriormente son para crear patinas gruesas por via húmeda. respecto a los químicos si te interesa te puedo ayudar a obtenerlos.
Pero la patina de las imágenes que has puesto son patinas muy finas seguramente están logradas por sulfuracion superficial del cobre.
Aquí tienes un video que te puede ilustrar como hacerlas: https://www.youtube.com/watch?v=yqAYnkPBOwk.

Como creo que tu nivel de ingles no es muy alto te resumo el procedimiento:

Primero obtiene sulfuro sódico, calentando en un crisol hidróxido sódico mezclado con azufre. El resultado los disuelve en agua. En la obtención del sulfuro sódico se desprende un olor picante de azufre quemado.
El sulfuro sódico huele a huevos podridos.

En un recipiente cerrado pone agua y un poco de sulfuro sódico y deja que los vapores de ácido sulfhídrico actúen sobre el cobre formando la patina de sulfuro de cobre. Supongo que luego la protejerá con un barniz.

salud!!