Letter 33012

Hull Cell Questions  

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Dear Sr. :

I have two questions about Hull cell :

Using the current density equation of the Hull cell ( C : I ( 5,1 - 5,25 log x) ) , There are an infinite currents that might be use ( usually described as 1,2, and 3 A ). I Need to evaluate additives between 200 and 500 Ampere per square meter.

Q1 : Which current should I work with the hull cell.

Q2 : What time of deposition should be use.

Sincere regards.

Peter Holmes
pH SA - Antofagasta, II Region, Chile

It might help if you would tell us about the plating bath you want to evaluate...

James Totter, CEF - Tallahassee, Florida

Dear Mr. Holmes:

You need to be more specific in your question.

Hull Cell can be applied to many electroplating processes, with different purposes.

Oscar Infante
- Santiago, Chile

Applied current and testing time all depend on what you are testing in the Hull Cell. There are set conditions for different plating systems, details of which can be found in any reputable book that discusses the Hull Cell. Try The Canning Handbook. No-one can answer your query unless you say what you are doing.

Trevor Crichton R&D practical scientist - UK

How do you read the hull cell ruler? it is stated from the ruler that it has 1, 3, 5 Amps. how much time should you use?1 min or more?

We are currently using SnPb chemistry for ic packaging. i'm a bit confuse as to how to read the ruler. i'm currently using 3 Amps 2 min. when i read the result using the ruler, i use the 3 amp portion and multiply the Current Density by 2..is this right? we are using 10-20 ASD meco plating machine.

I hope you guys can answer this question the soonest. thanks in advance!

Michael Tongson
semiconductors - Laguna, Philippines

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