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).
The corrosion and casting properties of various aluminium alloys.
| Identifier | ExFiles\Box 149a\1\ scan0045 | |
| Date | 16th June 1933 | |
| C.Wor.{Arthur Wormald - General Works Manager} C.Hs.{Lord Ernest Hives - Chair} C.Hy.{Tom Haldenby - Plant Engineer} X359 Hl.2/J.16.6.33. Re: Aluminium Alloys (see E2/HP.6.5.33.) -------------------------------- Corrosion under boiling tap water (Derby) shew some improvement with R.R.66 as compared with R.R.50 (standard alloy), but the resistance is less marked than when a comparison is made in the presence of sea water or sea spray. (cold) Should the radiator water be more corrosive than our tap water, it is anticipated that R.R.66 would be considerably better than R.R.50 - on the other hand with rain water or artificially softened, doped, or purified water there would be little to choose between R.R.50 and R.R.66. If it is considered that practical tests (on engine) are desirable, it would be preferable to give our Chromic Phosphate boil treatment prior to linseed treatment. The casting properties of R.R.66 are not as good as R.R.50. (It may be that some of our unfavourable experiences with the aluminium alloy as water pump castings may be due to earlier experience when 8% Copper or 2.L.5 Alloy was in use. These are much worse from the corrosion stand point than R.R.50.) Hl. He. | ||