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topic 3191

Power Supply for Hobbyist Zinc Plating


A discussion started in 1999 but continuing through 2019

1999

Q. I'm very pleased to have found this website, and hope I can find some assistance. I am setting up a small hobbyist zinc plating operation. I have all of the required materials, but my question relates to power supplies. The materials I have suggest approximately 1-1/2 volts applied to the cathode and anode, at a rate of .025 amps per square inch of material to be plated. The parts I plan to plate range from an inch to 400 inches or from .025 amps to 10 amps.

D-cell batteries will only work briefly for the smallest of items. Unfortunately there seems to be no source for an affordable adjustable power supply. I considered using an inexpensive auto/marine battery charger [linked by editor to product info at Amazon] as a source, some are available in 10/2 amp settings for 6 and 12 volts. I had hoped to use resistance to control the power to the required settings. I dug out my old college physics textbooks and spent much of this morning number-crunching, and it seems possible to use resistance in series with the plating load to reduce voltage and resistance in parallel with the plating load to reduce amperage flowing to the plating load. I've calculated the required resistors and none seem to exceed 420 ohms at 10.5 watts. I found variable coil resistors that can handle this load.

Am I on the right track or are my assumptions flawed? Am I missing out on some simpler/more affordable approach? Any help that can be offered is greatly appreciated.

Damon K [last name deleted for privacy by Editor]
- North Wales, Pennsylvania


1999

A. It would take dozens of D batteries in parallel to deliver 10 amps @ 1.5 volts. The parts cost for a line-powered 1.5VDC @ 10A power supply shouldn't be too much, perhaps an experienced electronics person could build one for you if you can't yourself. Try a surplus electronics store to keep the cost down. If 6 volts is really too much, then this might be the way to go.

Joe DavissonJoe Davisson signature
Joe Davisson
St. Louis, Missouri


1999

A. Battery chargers generally supply unregulated, unfiltered power, with lots of ripple. This is good for charging batteries but not so good for certain kinds of plating. It's not hard to build a power supply. Radio Shack has a great little book with detailed plans for constructing voltage regulated power supplies. That might be the way to go, if you can't find a used one. By the way, controlling voltage and current with resistance can be done, but in the 5 - 10 amp range the resistance elements will have to dissipate a lot of power and can get mighty HOT.

dave wichern
Dave Wichern
Consultant - The Bronx, New York


1999

A. Why don't you use the battery for the source of current in plating, and recharge a second battery with the battery charger offline?

tom pullizzi portrait
Tom Pullizzi
Falls Township, Pennsylvania


2000

A. You could try using a PC switch mode power supply. These power supplies are usually thrown away with old computers, I'd be surprised if you had to pay money form one. The +5V output is regulated and usually have > 15A current rating. Make sure you use *all* the red and black wires at these current levels and keep below %80 rated output. These supplies are built at absolute minimum cost so don't expect them to be a rugged and reliable power source.

Happy plating
Adam

Adam Seychell
- Melbourne, Australia


2002

? What kind of plating you want to do? Decorative, Corrosion protection etc. What kind of solution you are using? How much money to invest?

Harshad v [last name deleted for privacy by Editor]
- Alhambra California USA.



Power supply for zinc and anodizing

December 27, 2018

Q. I am new to plating and I'm restoring an old tractor. I would like to re-plate the bolts and some of the brackets. I ordered a zinc plating kit from an online retailer. They sell the power supply also but for the surface area I would like to plate, the power supply of adequate size is to expensive. I need at least a 10 amp supply. I have seen some on ebay/amazon but I'm not familiar with all the technical specs to know if they will work for plating. One unit is a BK Precision 1746 linear 0-16v/0-10amp. the other is a Korad KA3010D linear 30v/10amp. Are these a suitable power supply for plating and anodizing?

Joe Kelly
Hobbyist, Restorer - Fort Walton Beach, Florida, USA


December 2018

A. Hi Joe. We don't comment on particular brands or sources (why?), but 16 V is far more than enough for zinc plating ... but iffy for anodizing some alloys. But there is a lot more to plating & anodizing than a power supply, so I would suggest trying some samples with whatever smaller equipment you have or can easily afford. I think you'll find bolts more difficult than you expect, so why not try to plate one with dry cells or an old 6-volt old tractor battery or battery for a child's ride-on toy before gearing up for production? Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


December 28, 2018

Q. Ted, Yes I still have a lot to learn. I have never experimented with plating. I have read a ton over the last couple of days to the point by brain hurts. I have been wanting to put a system together for some time now.

I'm looking to keep it simple in the sense that I just want to flip a switch, adjust my values with the knobs on the PSU, and plate. I really don't want to mess with batteries, chargers, light bulbs and such. Maybe I'm over thinking the whole thing and making it more confusing than it is.

I'm looking at trying to zinc plate up to about 60 sq. inches and anodize up to about 30 sq. inches. Could you recommend spec's and features in a PSU that I should be looking for?

From what I have read there are basically two types: a linear and switching. Does it really matter in plating which one to use?

Joe Kelly [returning]
- Fort Walton Beach, Florida, USA


December 2018

Plating/Anodizing Power Supply
0-15V 0-5A


A. Hi Joe. My understanding is that switching power supplies involve using electronics to change the frequency of the incoming current from 60 Hertz to a much higher frequency so that the transformer can be much smaller; and that they became popular as a result of the micro computer revolution in the mid to late '70s because hobbyists and consumers didn't want to lug around a fifty pound transformer with their Apple 1 and such. Industrial plating, with its very high amperage power supplies (often many thousand Amps), was slow to adopt switching power supplies but they are no longer uncommon.

10 Amps is a very small plating power supply by industrial plating standards, but adequate for 30 to 60 sq. inch parts ... and for zinc plating and anodizing I don't think there's any particular advantage to a 10 Amp linear power supply over a switching one.

But the idea of keeping it simple and just flipping a switch and plating probably has a number of well seasoned electroplaters with their decades of experience chuckling ... which is why I'm suggesting you try to successfully plate one part before committing to refurbishing the plating on your whole tractor. Knowledge & experience, not a particular power supply, really is the heart of the matter.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


December 28, 2018

Hi Joe
As one of Ted's old platers ........
A couple of things you need to know.
Prep for plating is vastly more important than for painting. Do you have the the essential chemicals for this and how to confirm that the cleaning was successful?
And do you have the chemicals to remove unsuccessful plating? You are not going to get it right first time.
Assuming you get a good deposit, you need to know that nuts and bolts are particularly difficult. Inside threads are difficult to get coverage and male threads build up on the peaks and starve the valleys. So threads that fitted perfectly before plating don't any more.
I like to see people trying new ideas; But I also like old tractors! There surely must be a local plating company that would give you the finish you want at a fraction of the cost of setting up yourself.

geoff smith
Geoff Smith
Hampshire, England


January 3, 2019

Q. Geoff Smith, Thank you for replying. There is not a plating company near me. I would have to ship all the pieces to a facility. A lot of the fasteners and bracket are either obsolete or very expensive to replace if lost. I have not contacted anyone (I might do that tomorrow) but from what I have read is that facilities will take it in one lump of parts. I have them sorted and tagged so I know where they go. If I get a pile of nuts, bolts, spring, clips and so on back in one pile, I will spend 2019 sorting them back out. I like learning new things and have the time to apply to this project. I know the zinc finish that I will get probably won't be as good as a professional plating facility but I'm ok with it. This tractor will not see any more farm life as long as I have it. It will be my own collector's item. I have been reading different forums and watching videos on the products I have bought and feel I will have great DIY hobby results.

Joe Kelly [returning]
- Fort Walton Beach, Florida USA


January 2019

A. Hi again, Joe. You can read and watch videos about how to rebound a basketball a hundred times, but you'll still totally stink the first time you hit the court. Please practice on scrap parts because, speaking of expensive, if you've redone the parts one-too-many-times and over-pickled them you won't be able to save them. If any of the parts are high strength steel, don't forget the baking before and after plating. Best of luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


January 7, 2019

Q. I have been reading about hydrogen embrittlement. I'm not sure of the grade fasteners used. The tractor that I'm trying to restore is a Kubota B6100. Mine was manufactured in 1979. All the bolts have a number stamped in the top 4,7 and 9. I know these numbers are used to indicate what torque is called for that fastener but would imagine the higher the number on the bolt head the higher the strength of steel. Most all the fasteners range between 6 mm-10 mm with a few 12 mm hold the axle gear case together. I'm having a hard time finding an appropriate bake schedule to follow. Especially since I don't even know what grade I'm dealing with. Any thoughts would be very appreciated. Thanks.

Joe Kelly [returning]
- Fort Walton Beach Florida USA


January 2019

A. Hi again. Please google for "bolt strength head markings" or a term like that. For someone to try to safely guess the strength and hardness of a fastener from a verbal description of a marking won't work.

Some fasteners are so hard that the specs forbid plating, but the basic idea of hydrogen embrittlement relief is bake before plating, then use only anodic cleaning and the mildest possible (or no) acids (substituting blasting for the oxide removal), then highly efficient plating, then baking again ASAP. Baking temperature 375 °F ± 25 °F for 3 hours minimum, probably up to 8 hours, and never use your kitchen oven for anything but food.

One final thing to keep in mind as you roam the internet for advice: While this site is fortunate to be blessed with many knowledgable readers, and concentrates on a narrow industry that the curator has worked in for 50 years, "instructional" and "how to" sites articles are (as we are) funded by advertising dollars ... many such articles were written by people with no experience or expertise in the subject whatsoever -- they exist not because they are actually able to educate you but to get you to click on ads. So, just because they tell you how to do something and what supplies to buy is no indication that the author has actually ever been anywhere near the issue s/he is writing about :-(

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"



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