removal of the final traces of foundry sand.
removal of heat treatment scale from most ferrous and non-ferrous metals.
including ceramic, rust, coatings etc
MACHINED COMPONENT CLEANING
the process does not harm machined surfaces.
LT2/2014 OPERATION OF THE SODIUM HYDRIDE PROCESS
Our process removes heat treatment scale from most ferrous and non-ferrous metals.
Sodium hydride is a powerful reducing agent. It is used for de-scaling at a concentration of up to two percent in a bath of molten caustic soda, where it reacts with oxide present on metal in the form of scale and reduces them to a finely divided metal powder, or sometimes to a loosely adhering flaky foil. Chromium oxide is the only common exception to this rule, being reduced to a lower oxide. This also adheres loosely, however, and can easily be removed.
Treated metal is unaffected. Unlike acid pickling, the sodium hydride process attacks the scale and not the underlying metal which means the metal cannot be over‑pickled.
Light scale can be removed in an hour or two but heavier deposits usually require overnight treatment.