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Cycle
of production
pretreatment
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Acceptance, control and subdivision for type of substrate: aluminium, steel, iron ...
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Control of the surface and eventual sand-blasting or shot peening (with ceramics) of the pieces. It is important to verify that the substrate has no rugosity or porosity superior to the ones requested on the finished piece, due to the peculiarity of NiP which accurately follows the surface without levelling it. Some pieces, as the clutch disks here on the right, are not treatable because, even if deoxidated, they will mantain, under the nickel deposit, the rusted zones etched on the surface.
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Assembly of the pieces on homogeneous rack for type of substrate and thickness of the requested deposit. On each rack we hook a work sheet, a control sheet and also some plates (2x7 cm) of determined thickness: they will be used, throughout the process, to verify the thickness of the NiP deposited.
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Racks are then sended to the washing line dedicated to the type of substrate to be treated. Different lines are needed for iron, aluminium, steel, sintered because these materials require different preparation cycles and products: a detergent for steel spoils an aluminium piece which, as well as the phases of washing with ultra-sounds, has to go through treatments of cementation not necessary for steel.
This phase of pretreatment is very important:
the first cause of rejection depends
on an inadequate pretreatment.
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