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 recommended process for the tinning operation on Nitroalloy parts.
| Identifier | ExFiles\Box 6\1\ 01-page157 | |
| Date | 1st March 1939 | |
| WOT. Hy.{Tom Haldenby - Plant Engineer} Sft.{Mr Swift} RIC. C O P Y. X5010 BYS/CEI.3.39. NITROALLOY - RE TINNING OPERATION. x7010 x C469 I have before expressed the opinion that the best method of cleaning, fluxing and tinning is to :- a/ - Clean in a chemical colander. b/ - Dip crank in molten ammonium and zinc chloride of equal weight proportions and leave until the crank or other part is up to correct tinning temperature and then immerse in tin bath. c/ - Dip in tin bath. I find that Messrs. Firth Derihons have tried this method successfully, and consider it is by far the cheapest and most effective method. Wor.{Arthur Wormald - General Works Manager} will remember I recommended the use of a chemical colander for tinning when I first reported, and have urged it since. I do not consider cranks should be hardened all over, as such a procedure is technically wrong. Only the journal and conn. rod bearing areas should be treated by hardening process. We are ordering up two each of SS.{S. Smith} and 20 HP. cranks in nitro alloy. I am definitely of the opinion that a chemical colander is the most efficient and economical method of dealing with the preparatory cleaning of the parts to be cadmium plated. BY.{R.W. Bailey - Chief Engineer} | ||