netneut  battle1 -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
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, Teds signature
Ted Mooney, P.E. RET
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

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2017     -    Privacy Policy
How Google uses data when you visit this site.