- •1. Explain electrodeposition technology of tungsten
- •2. Discraibe the electrodeposition technoly of molybdenum.
- •3. Explain electrodeposition technoly of rhenium
- •4. Explain electrodeposition technoly of platinium.
- •6. Explain electrodeposition technoly of rhodium
- •7. Explain electrodeposition technoly of osmium.
- •10. Give a certificate of electrochemical methods of Thallium
- •11. Explain electrochemical deposition methods Iridium
- •13. Tell about electrochemical methods of producing niobium
- •12. Give an explanation about Electrochemical methods of obtaining germanium.
- •14. Give an explanation about Electrochemical obtaning methods of vanadium
- •16. Explain about the technology of electrochemical production of bismuth
- •17.Tell about the technology of electrochemical production of titanium
- •18. Tell about the technology of electrochemical production of gold
- •19.Tell about the technology of electrochemical production of silver.
- •20. How to prepare electrolyte for electrodeposition of niobium from organic solution
- •21. How to prepare alkaline glycerol electolyte for electrodeposition of antimony.
- •22. How to prepare alkaline electolyte for electrodeposition of Gallium
- •24. Explain Kazarov, Loshkarev and chloride electrolyte solution for obtain indium.
- •25. Discribe about Marchenko, Ionychev and cyanide electrolyte solution for obtain indium.
- •26.Discribe about sulforic acid and hbf4 electrolyte solution for obtain indium.
- •27. Iurev and Icakova Elctrolyte for obtain ruthenium.
- •28. How to prepare chloride or Kadaner electrolyte for electrodeposition of ruthenium
- •29. How to prepare electrolyte solution for electrodeposition of ruthenium
- •30.Discribe about electrolyte solution for electrodeposition of platinium.
- •31. How to prepare chloride electrolyte for electroreduction of paladium
- •32. How to prepare chloride electrolyte for electroreduction of paladium
- •33.How to prepare nitrite electrolyte for electroreduction of paladium
- •34. How to prepare sulfamine and monoethanolamine electrolyte for electroreduction of paladium
- •35. How to prepare amino chloride electrolyte for electroreduction of rhodium
- •36. Tell about electrolyte composition for obtain of osmium
- •37. Explain chloride electrolyte for obtain Iridium by electrochemical process.
- •38. Tell about nitrite electrolyte solutions for deposition of platinium.
- •39. How to prepare nitirc electrolyte for electrodeposition of bismuth
- •40. How to prepare organical electrolyte for electrodeposition of bismuth.
- •41. How to prepare electrolyte solution for electrodeposition of arsenium
- •42. Explain cyanide electrolyte solution forelectro deposition of silver.
- •43. Explain cyanide electrolyte solution for electro deposition of gold.
- •44. How to prepare sulfamine and monoethanolamine electrolyte for electroreduction of palladium
- •45. How to prepare amino chloride electrolyte for electroreduction of rhodium
17.Tell about the technology of electrochemical production of titanium
Electrochemical deposition of titanium produced from a melt or from a non-aqueous solutions. During the precipitation melts selected from most fusible eutectic mixture of metal chlorides, for example a mixture containing 58.6 molecular fraction expressed as a percentage, lithium chloride and potassium chloride and 41.4 are introduced into it about 3% titanium lower chloride. Electrolysis lead melt at 400 ° C, DK = 10 A / dm2 with soluble anodes made of titanium grade BT-1 in an inert gas atmosphere such as argon. The coating thickness of 30 microns deposited at a specified mode for 10 min.
During the precipitation of the titanium complex used nonaqueous solutions salitsilanilin complexes of titanium tetrachloride in the mixture of ethyl ether and formamide lead deposition process at a speed of 1.0-1.5 m / h at a current density of 1.0 - 1.5 mA / dm2.
For contact deposition of titanium steel it provided a non-aqueous solution comprising the following components (mg / l):
Titanium tetrachloride (5N) 200
Methyl alcohol 800
The deposition process is carried out at a temperature of 15-25 ° C for 0.5 hours without using an inert atmosphere.
18. Tell about the technology of electrochemical production of gold
In the absence of finished gold salts they are prepared directly in the shop in two ways: the anode and the chemical dissolution of metallic gold. The first method is suitable only for the preparation of cyanide electrolytes and is technologically simpler and more economical than chemical dissolution. When using the method of anodic dissolution working gilding bath filled with electrolyte composed of potassium cyanide solution in distilled water to a concentration of 20-30 g / l, and heated to a temperature of 70 ° C. As used anodes anodes of gold dissolution with the greatest possible area. The second method for preparing gold salts suitable for preparation of both cyanide and ferrocyanide electrolytes and is chemically dissolving gold in aqua regia. Cyanide electrolytes are characterized by high throwing power, the fine structure of the precipitated metal and satisfactory current efficiency.
Gilding small products produced by the following scheme of the process. 1) Тumblingin the drums with steel balls. The purpose of this operation - polishing the surface of parts. 2) Rinse in hot water and the copper parts in a bath with hot distilled water (to trap the electrolyte) silverware. 3) Mounting parts for the suspension or mesh. As a material for the suspension is most advisable to use copper 4) Electrochemical degreasing. 5) Flushing with hot water. 6) bleach etching. Silver is used for parts and is made in 10% sulfuric acid solution heated to 60-70 ° C for 10-15 min. 7) rinsing in cold water. 8) neutralization in 10% soda or potash solution (silver for details). 9) picklingin thepotassium cyanide solution with a concentration of 30-40 g / l. 10) rinsing in cold water. 11) Gilding. Made in one of the electrolyte, the characteristics which are given above. 12) Washing To avoid the accumulation of gold salts in the bath catching the washings to periodically update them. In this case the first wash water from the bath is poured into a continuously evaporated gold plating electrolyte, washing water is poured from the second bath from the first and the third - the second. Third bath filled with distilled water. 13) rinsing in cold water.