netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com 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!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 3201

Difficult copper plating applications: tiny I.D.s, and inside of slots


(1999)

Q. I would like to copper plate (both internal and external) 1028 DOM steel tubing, during the development of a new product. The I.D. of the tubing is .250" and they are 4" long. Can I do this with a "safe" electroless process? If so what would the electrolyte be? Thank you again. Mark

Mark Robidoux
- malvern, Pennsylvania


(1999)

A. It might plate the full length of the ID if you used a proprietary "high Throw" EC. Safe is a very subjective word. An insurance company would not think that running an electroless copper line was very safe, especially with no prior experience. Your workman's comp will probably go up several percent.

James Watts
- Navarre, Florida


(1999)

A. One option you could use would be to Brush Plate the ID of the tubes. With Brush Plating you don't have tanks or the insurance costs that go with them.

David Crocker
- Valencia, California


(1999)

I have done a fair amount of brush plating and would like to see the anode and wrap that can plate the inside of an 0.250 tube that is 4 inches long with a low end of the pay scale machine shop person doing the work. I would like to do a metallographic cross section before I will say it is equal to a electroless copper plated part with lots of agitation from the bottom of a vertical tube.

I also think that in most states, a plater and a brush plater are considered to be in the same category, IE: a generic one.

It is true that the volume of the solution is less and the hazardous waste should also be less.

Brush plating has many very good applications, I just do not think that this is one of them.

James Watts
- Navarre, Florida


(1999)

We have plated silver on stainless steel tubes with a diameter of .5 inches and a length of 4 feet for the U.S government with excellent adhesion to the base metal. These parts were cross sectioned and passed all their testing. Brush plating was not their first choice, but it is the only one thats works for them. As for the anode, we have various types and styles the smallest anode being .020" in diameter.

David Crocker
- Valencia, California


(1999)

I have to agree with James Watts on this one. Yes, perhaps the component could vaguely be brush plated; but it also could be tank plated with an auxiliary anode; it could also vaguely be electroformed from a layer of copper, followed by a very heavy layer of iron plating followed by another layer of copper; and there are other vaguely feasible approaches as well. But the inquirer asked whether simple electroless plating sounded feasible--indeed it does, and probably more practical than the alternatives. The difference in the 'safe'-ness of brush plating vs. tank plating seems pretty slim to me, but see letter 3243, "Exceptions from Pretreatment Regulations for Touch-Up Plating Operations" -- could be there is a difference.

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



(2002)

Q. I am looking to plate copper on a steel grade 440C shaft. The copper must be deposit in slots machine length wise on the shaft. Slots are 2.5 mm width, 1.5 mm height and 40 mm in length. Overall length of shaft is 150 mm. Diameter is 35 mm. I need the copper to completely fill up the gap in slot. This is a design requirements for this shaft to work as squirrel cage.

Looking for a process to do this.

Regards,

Vincent Ho
- Singapore


(2002)

A. A problem with a project like this is that you end up trying to simultaneously develop a new technology approach to push forward the art, while you are simultaneously learning the basics of the required processes to do it as a beginner with no experience :-)

The thing to do is probably to decide on a technology and send the project out to people who are skilled in that technology. I think if you send it to a highly skilled and experienced electroformer, they may take a few days to get it right with all their skill and experience, or to tell you it can't be done; but if you try to do it yourself, it will be years before you even know if the problem is the limits of the technology or the lack of knowledge of a beginner.

Send it to a top notch electroformer.

Guillermo Marrufo
Monterrey, NL, Mexico


(2002)

A. Electroform it

Russell Richter
- Danbury, Connecticut, USA


(2002)

A. Hi,

Your design seems to be a good candidate for other process than plating. Plating is most inefficient trying to fill recesses, holes or anything similar. You probably would like to investigate sintering, a powder metallurgy process at very high pressures and moderate temperature where the layered metal is provided in powder form. This is very common for complex shapes of copper and other expensive metals and alloys,

Bye,

Guillermo Marrufo
Monterrey, NL, Mexico


October 3, 2012

A. Hi Vincent, It sounds like you are trying to make an air bearing spindle although 35 mm is a bigger diameter than most on the market which are commonly used for dicing, or drilling printed circuit boards. So maybe you have a new application? Electroforming is the way to produce them, but you need top quality copper and adhesion otherwise it could fall apart when it rotates. What speed do you intend to rotate this shaft at? I know it is possible with small spindles to go up to 300 K RPM, but with 35 mm diameter maybe only 60 K RPM is needed. And yes it is possible to fill the grooves all the way up!

Wendy Chilton
- Chester, Cheshire, UK



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 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.