Boys from Blighty here - Reporting on restoration of the Briggs and Stratton. As the wind and rain lash against the Polishing Shop window we prepare the engine for painting. The previous blog entry showed how we had attacked the rust with a coating of 40% phosphoric acid. Here's the chemistry lesson again -
Rust is really Fe2O3, a reddish form of iron oxide. Iron has another oxide, Fe3O4, which is sometimes called black oxide, black rust, or hammerscale. Our application of acid the other day has now created black oxide which when brushed off gives an ideal surface for accepting paint.
Gloss black engine enamel. (Just like a Vincent Black Shadow.) The first coat of this paint is now drying........
Time for a well earned beer over at 'The Old Sidevalve Bar'