From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Chemical analysis procedures for determining the presence of Magnesium, Nickel, and Copper in an alloy.
| Identifier | ExFiles\Box 115\5\ scan0193 | |
| Date | 1st November 1938 | |
| -3- RM{William Robotham - Chief Engineer}/CTC.3/JE. 1.11.38. Determination of Magnesium. Dissolve 2 gms. of alloy in 10% caustic soda. Dilute, allow to settle and filter. Dissolve residue in nitric acid, evaporate with sulphuric (10 cc.) dilute, ppt. tin as sulphide and filter. Take filtrate, boil off hydrogen sulphide oxidise, add 1 gm. of tartaric acid, and make alkaline with ammonia. The solution should be clear. Add 10% 20 cc. ammonium phosphate sol'n. and excess ammonia to ppt. magnesium as phosphate. Filter off, wash, ignite and weight. Some manganese phosphate is co-pptd. and is determined in the ignited ppt. after dissolving in sulphuric acid. as above. (See determination of manganese. Determination of Nickel. Dissolve 2 gm. of the alloy in hydrochloric acid, oxidise with nitric acid, add 10 gm. of tartaric acid, dilute to at least 100 cc. and make alkaline with ammonia. Ppt. nickel with dimethyl glyoxime, filter off, wash and dissolve in dilute hydrochloric acid. Boil to destroy dimethyl-glyoxime, make just alkaline with ammonia and after cooling titrate with potassium cyanide using silver nitrate and potassium iodide as indicator. Determination of Copper. Dissolve 2 gm. of the alloy in 10% Caustic Soda. Dilute, allow to settle and filter. Dissolve residue in nitric acid, evaporate with sulphuric acid (10 cc. of 50%) dilute, and ppt. tin and copper as sulphide. Filter off and ignite the sulphides. Dissolve oxides in strong nitric acid and estimate as usual with dilute sodium thio sulphate and potassium iodide. | ||