- •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
- •12. Give an explanation about Electrochemical methods of obtaining germanium.
- •13. Tell about electrochemical methods of producing niobium
- •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
45. How to prepare amino chloride electrolyte for electroreduction of rhodium
Of the electrolytes for the deposition of rhodium greatest application received sulfuric acid, phosphoric acid, as well as the possible deposition aminohloride, fluoboricSulphate and Chloride. Special mention should be on the precipitation of rhodium from aminohloride electrolyte. Laboratory tests revealed that the electrolyte contains only one aminohloride salt of rhodium [Rh (NH3) 5C1] C12 C Rh8 + concentration of 6-7 g / l in terms of metal. For preparation of electrolyte per liter of 25 g taking RhCl3 * 4H20, dissolved in 100 ml of distilled water, the resulting solution is heated to 40-50 ° C with vigorous stirring and treated with an excess of 25 percent aqueous ammonia. The mixture solution with a dark red precipitate is put in a water bath and maintained at 90-95 ° C to precipitate the transition in ammonia complex lemon-yellow color and remove excess ammonia. The reaction of formation of the complex is on the equation RhCl3+ 5NH4OH= [Rh (NH3)5C1] Cl, + 5H,0.. The resulting solution was topped up with hot distilled water to 1 liter, adjust pH value in the range 7.5-8.5 and start operation of the electrolyte at the following regime: Operating temperature in ° C --------------- 70-80 Cathodic current density in DK and / dm1 ---------- 2-4 The current efficiency --------------- 57-63% The value of pH ------------------------------------ 7,5-8,5 As insoluble anodes used either sheet rhodium ratio of anode area to cathode 5: 1 or spectrally pure graphite plates. For the electrolyte necessary mechanical agitation and periodic filtration. Adjustment of the electrolyte is to maintain the concentration values Rh3 + and pH. These coatings have a bright and shiny surface, fine-grained structure and microhardness of about 850 kg / mm2.