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topic 12378

Plating time in barrel plating


 

I am using ammonium chloride zinc plating (barrel plating). For getting 3-4 microns it takes 2-3 hrs. We are plating to the fasteners of different types. How shall I reduce the time of plating? What factors can affect the plating time.

Santosh Zope
- Dubai, UAE


 

It sounds like you have about one fifth of the current you need. Please start by cutting the load in half without reducing the amperage and tell us what happens.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

Adjusting your current density, higher, will increase plating rate. Also optimize other parameters in the solution, zinc metal, pH, temperature. Another variable to look at will be barrel design, barrel speed and loading in barrel. You should have a barrel that has the largest open surface area so you can get the most transfer of solution into the barrel.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


 

Factors that can affect plating rate.

1. Current Density can be increase to increase the plating rate. However, there is a maximum point where too high current density will create another set of problems such as burning and poor quality work.
2. Increasing the metal concentration in the process solution will increase the plating rate.
3. Bath pH concentration will impact plating rate. At lower pH concentration, hydrogen will plate out like a metal; thus, competing and lower the plating rate of the desired metal.
4. The concentration of the organic package such as wetters or brighteners will affect plating rate depending on the situation. For example, too much organic additives may reduce the plating rate, or wetters may be required so the part to have a good cathode film which may increase the plating rate.
5. Unwanted organic or metallic contamination will negative impact on the plating rate.
6. Temperature: most chemical processes increasing temperature can increase the rate of reaction such as increasing the plating rate, but it may also have a negative impact on the plating rate as well depending on the situation.
7. Solution agitation will affect plating rate. Increase the solution agitation will increase plating rate.
8. In a barrel plating operation, slower barrels speeds will increase the plating rate by increasing your coefficient of electrical contact within the barrel.

Karl Weyermann
- Lebanon, Kentucky



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