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).
Process for applying protective enamel coatings to steel, bronze, and brass parts.
| Identifier | ExFiles\Box 76\3\ scan0095 | |
| Date | 26th April 1917 | |
| R.R. 235A (500 T) (S.D. 403. 26-4-17.) Bm. 2/156/13. En. c to EFC. c to Mr Roscoe. c to Works. H13/EB19619. Laboratory. Re Protective Coating of Steel, Bronze and Brass parts. As a result of a number of tests, it appears that the best results from the works point of view would be a simple thin enamelling process, preferably on a prepared surface. In the case of steel, the part would be preferably fine sand blasted and oxidised to a blue by heating to a temperature of about 300 C; these are not essential however, but tend to give somewhat greater coherence and resistance to corrosion. Should coarse sand be used for sand blasting it would be an advantage if the surface were shot blasted subsequently in order to reduce the coarseness of the surface. In the case of Brass and Bronze the surface should be prepared for the enamelling by a thin tinning process as employed as a preliminary to White metalling. Enamelling. This can be done with the Egg-shell varnish or enamel supplied by Messrs. Dockers & Co, Birmingham, or as a substitute we have found that the composition below gives good results:- 3 pints boiled Linseed oil. 3 " Black Enamel as used for Springs. 3 " Turpentine. 1 lb Vegetable Black. A little rosin up to about 2% may be added if more body be required. The same mixture may be used for Brass, Bronze or Steel. We are doing a number of parts, spanners etc according to the above treatment, of which some are already available for inspection. | ||