A state of metal where surface preparation has removed all rust, scale, and previous coatings, exposing the raw, shiny base material. In this condition, the metal is highly reactive and vulnerable to immediate flash rusting if exposed to moisture or high humidity. It requires rapid application of a primer or protective layer.
We blasted the spool piece to a bright finish, so get the primer on it before the humidity spikes.
A bright surface will turn brown with flash rust in less than an hour if the dew point is too close to the ambient temperature.
Also heard as
- bare
Related terms
White metal blast
Top abrasive blast cleaning grade: bare, uniform steel with no visible residue, rust or staining.
Near-white blast
Blast grade allowing light shadows or stains on no more than 5 percent of the surface, the usual immersion standard.
Flash rust
Thin, quick layer of rust that forms on freshly blasted or water-washed steel within minutes to hours.