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).
Laboratory report detailing the analysis of a corrosion product from a radiator.
| Identifier | ExFiles\Box 94\3\ scan0294 | |
| Date | 2nd March 1939 | |
| 3409. Rm{William Robotham - Chief Engineer}/F.J.H. Hl./BPS. 4/JM.{Mr Morley}2.3.39. Laboratory. Report 4777. Re: Corrosion Product from Radiator of Ph.III chassis 3.AX.167. Herewith analysis of the above corrosion product, after removal of numerous pieces of solder, which we found present. Aluminium hydroxide . . . . 68.8 %. Iron hydroxide . . . . . . 11.0 %. Lead . . . . . . . . . . . 0.9 %. Copper Oxide . . . . . . . 0.8 %. Calcium carbonate . . . . . 3.0 %. Magnesium carbonate . . . . 3.1 %. Silica . . . . . . . . . . 7.2 %. Chlorides . . . . . . . . . traces Organic matter (rubber) . . 5.2 %. The deposit was slightly acidic, due to the traces of chlorides present; whether the chlorides were derived from traces of soldering flux which might have escaped washing, subsequent to soldering, or from the water used in the system, we cannot say, since we are not acquainted with any details regarding the cooling water used. The chlorides, however, were not present in sufficient quantity to have been instrumental in causing corrosion. The above percentages of calcium and magnesium carbonates are higher than usual; these have been deposited from the cooling water, in which they were present as bicarbonates. Hl./BPS. | ||