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).
Heat treatment process to protect Phantom cylinders from corrosion and requesting hardness tests.
| Identifier | ExFiles\Box 14\3\ Scan044 | |
| Date | 29th October 1929 | |
| +7050. ~~EFH~~ ~~c. ST/Mr.Pendlebury.~~ ~~c. Nor.~~ ~~c. HS.{Lord Ernest Hives - Chair}~~ ~~c. HL.~~ PHANTOM CYLINDERS. ------------------- HL. has reported that he has obtained experimentally extremely good results in the way of protecting cast iron against corrosion by means of moderate temperature treatment which gives a protecting skin of oxide iron. We are informed that this skin can be produced by heating the cylinder at a temperature of 500 to 600°C for a period of from 2 to 3 hours. The higher temperature will undoubtedly give better results, and the time may be shortened if it is found that we can use this temperature without seriously affecting the hardness of the castings. As a preliminary we would like you to take three cylinder blocks, and brinell same before treatment and afterwards maintain them at a temperature of 600°C for two hours. We should like to have your report after this treatment as to the brinell hardness of cylinder castings. It will of course be obvious, that after the internal portions of the cylinder have been scaled by means indicated above, that some measures will have to be taken to prevent the film being destroyed by any subsequent operation such as sand blasting. It appears to us that we shall have to have some covers made to ensure that the sand itself does not penetrate to the water passages inside the cylinder. BY.{R.W. Bailey - Chief Engineer} | ||