Revaltec is a factory at risk with a treatment authorisation.
All cleaning solutions, pickling baths and treatments are removed semi-annually by a specialised company, which disposes of all products (alkalis, acids and salts) separately.
During the treatment, the air above the solutions is drawn off and sent to a scrubbing column before being expelled outside. Furthermore, for the more corrosive baths, employees also wear a protective mask for added protection.
Employees are also outfitted with chemical-proof clothes.
First, cylinders are degreased in a detergent solution; they are then cleaned and rinsed.
Where the cylinder is already nikasiled, it must be stripped of its original coating. This operation requires a concentrated nitric acid solution to dissolve the nickel.
Treatment is carried out at a constant temperature, in 2 tanks in which the solution is stirred by compressed air. Stirring is essential to suspend the silicon carbide particles.
Nickel must be added periodically. This operation is performed automatically by a metering pump. A slight amount of excess matter is added to allow for the cylinder’s machining.
A full treatment, including the preparation cycle, takes a long time (5 hours on average); the duration will vary depending on the desired thickness of the coating. This time does not include any precision-grinding procedure the part may require.