MIL-HDBK-1165
a) Flow restrictors or control systems - restrictors
for manual control and controller systems for automation of the
flow of freshwater into the rinse tanks.
b) Conductivity controllers - devices used to measure
the total dissolved solids in the rinse water and automatically
adjust flow control valves.
c) Drip trays (or bars) and drain boards - devices
that reduce drag-out during transportation of an item between the
plating and rinse tanks by collecting the lost solution and
returning it to the plate bath. Figure 14 illustrates such
devices.
d) Splash guards - devices which reduce spillage of
bath or tank solutions caused by movement of the item in and out
of the tank.
e) Wetting agents - cause plating solutions to flow
more easily over and attach evenly to the surfaces of the
workpiece. This reduces drag-out.
f) Automatic nozzles - for use on continuous flow
rinse tanks, these devices allow the operator to shut off the
water when not needed, eliminating continuous water flow.
g) Timers - allow the feedwater to the rinse tanks to
be automatically shut off when fresh feedwater is not required.
h) Air knives - devices which work by using air
streams to blow off excess solution from the plated parts. The
excess solution then drops back into the tank, reducing drag-out.
i) Spray rinses - several spray heads are mounted in a
tank chamber and either manually or automatically controlled to
rinse the workpiece as it is drawn out of the tank. Spray
rinsing is not recommended for parts with many sides or small
crevices, as the spray will not reach these areas as effectively
as a dip rinse.
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