| |
In the chemistry of plating, and metal finishing, agitation renews the cathode film, decreases polarization and enables the use of higher current density. This means finer grain deposits and higher plating speeds. In rinsing, agitation prevents localized concentration of drag-in. It also lowers drag-out and minimizes the amount of rinse water needed. Lower rinse water loads reduce the size and cost of water treatment equipment required by environmental authorities. Two varieties of agitation are popular, viz, air agitation and eduction / whirling.
Air
Turbo blower has dynamically balanced double faced impeller for oil-free air flow, generated by volume displacement, there is no metal-to-metal contact and has a specially designed silencer for low noise level.
 - Oil-free, no lubrication required.
- Non-pulsating flow.
- Low maintenance.
- Compact in design.
- Light weight.
- Low noise.
Typically, following capacities are popular :
|
Cu Feet/ min |
Horse Power |
|
40 cfm |
2.5 |
|
70 cfm |
3 |
|
100 cfm |
5 |
|
150 cfm |
5 |
|
200 cfm |
7.5 |
|
300 cfm |
10 |
|
400 cfm |
12.5 |
Eductor
 This system provides solution agitation with a centrifugal pump by drawing liquid from the tank and delivering it back into the same tank through a sparger system with eductor nozzles strategically placed along the sparger pipe. This type of agitation also prevents settling of solids at the tank bottom. Eductor nozzles, without additional horse-power, create agitation five times greater than the input volume of liquid.
Proven Benefits Of Ser-Ductor Systems In Plating Applications
- Reduces air borne fume emissions by 90%.
- Saves heating costs up to 25%.
- Reduces brightener consumption 20%.
- Saves metal as a result of more uniform brightness and thickness distribution.
- Improves throw and deposit thickness in blind holes and recesses.
- Permits increased current density, especially compared to cathode rod agitation for faster plating rate.
- Reduces carbonates in alkaline processes.
- Reduces or eliminates gas-pitting.
Sizes / capacities / quantities of eductor nozzles and pump selection are made relevant to the tank sizing, liquid volume and height of liquid column.
|
