Custom Masters/Flo King
Phone: 407-331-4634
Fax: 407-331-0575

FAQ

CAN I USE A FLO KING PUMP IN HARD CHROME PLATING OR OTHER CONCENTRATED CHROMIC ACID SOLUTION?

PUMP USAGE FOR HARD CHROME

Most hard chrome customers use Flo King pumps strictly to recirculate/agitate the solution (without filter cartridges attached). Some also use the pump for filtration, but there are special filter-cartridge requirements, as discussed later below.

PUMP MATERIAL OF CONSTRUCTION FOR HARD CHROME

CPVC is usually specified and provides satisfactory service for many applications. PVDF (Kynar) is the preferred material but costs considerably more and many users are unwilling to pay for it.

A titanium (or titanium-tip) internal shaft is required for standard hard chrome and other concentrated chromic acid solutions. Hastelloy may also be satisfactory.

For fluoride-containing hard chrome solutions, a Hastelloy or (Hastelloy-tip) internal shaft is required

FILTER CARTRIDGES FOR HARD CHROME

The Permacore "Super Magnum" Reusable Filter Cartridge is the only type we offer that withstands hard chrome or any other highly concentrated chromic-acid solution for any appreciable time. Standard polypropylene disposable cartridges disintegrate rapidly in hot chromic acid.
 
The "Super Magnum" reusable cartridge consists of a polypropylene core, POLYESTER reusable filter blanket (30 or 75 micron), and plastic web to hold the assembly together. The filter blanket can be cleaned with a spray hose and water and then re-rolled around the cartridge core for reuse.

Select this link for more information about reusable cartridges for hot chromic acid.
 

FILTER CARTRIDGE REPLACEMENT FREQUENCY

The reusable cartridge cores may last for six months in hard chrome and then generally become brittle and must be replaced. The blankets are available in a pack of six and can be replaced as needed (when dirty or worn). The plastic Webs may last a few months, are inexpensive and can also be replaced as needed. See this link for photos of these parts:

CORROSION NOTE

The pump must be mounted in a well-ventilated area for maximum motor life in this hot, corrosive application. The pump must not be mounted in front of the ventilation exhaust, as this will have the effect of exposing the motor to a continuous stream of hot, corrosive fumes.