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Suggested temperature of alkaline cleaner and electrocleaner for zinc plating process




Q. We have several alkaline cleaners and electrocleaners on our Zinc and phosphating lines (all barrel lines)and we typically control our baths at 160 degrees F. We have limited ability from our boiler system to increase that temperature. We also have some cleaning problems when trying to clean fasteners that have several kinds of heading,threading,heat treat and grinding oils. My question is this, if we were able to increase our temps. to the 180 degrees F to 195 degrees F range, would we experience better cleaning?

Mike [last name deleted for privacy by Editor]
- Rockford Il
1999


A. Hi Mike, I definitely think it is worth investigating. You mention several lines, can you try it out first on one of your smaller lines to prove it? I have been taught that for every 10 deg. rise in temperature your cleaning efficiency will double. The one thing to watch out for will be transfer time out of the cleaner and into the rinse. You might have to speed it up to keep the cleaner from drying out on the parts before the rinse.

Rick Richardson, MSF
Dayton, Ohio
1999


A. One other issue is the effect on the equipment. 195 F is too hot for plating barrels if this is barrel plating!

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
1999


A. Ted, You are absolutely right on checking the equipment for the higher temperatures. Plastic tanks may need to have extra reinforcement or metal liners and Koroseal lined steel tanks should never be ran over 140-150 °F. But we have a six station automatic barrel line for plating electroless nickel and our barrels have held up fine for many years. They are polypro and the normal operating temp. is 188-192 °F.

Rick Richardson, MSF
Dayton, Ohio
1999


A. You would probably see some improvement in the cleaning if you have heavy oils. The rate of chemical reactions generally doubles for a 10 °C, not F, temp rise. This is a rate, not cleaning quality.

If your cleaner is silicated, I would not do it. Some of the additives in some cleaners will degrade much faster with the increased temp.

Consider converting one of your cleaner tanks to an electrocleaner, or better yet, add one to your line if possible.

You might have to tumble or grit blast some of the parts to get them clean.

James Watts
- Navarre, Florida
1999


A. Mike- Another avenue to explore is adding some agitation to the tank. This may provide the boost in cleaning action needed to get into the threads, etc. If this is not possible, then an increase in temperature or chemical concentration or even a low temp cleaner might be the answer.

Dan Brewer
chemical process supplier - Gurnee, Illinois
1999


A. Dear Mike

Increasing temperature of cleaner reduce the viscosity of the oil to be remove and as a result there achieve of better cleaning.

In some proprietary formulation especially those with non ionic surfactant, increasing the cleaner temperature over the cloud point of the cleaner will result reduce cleaning efficiency .

I suggest you to investigate every solution before increasing temperature.

Yours

yehuda blau
Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel
1999




Rainbow coloration on parts after electrocleaning

Q. Is it okay that the pieces has a rainbow color after electrocleaner?

Aaron Garcia
MEFASA - agua prieta
August 21, 2019


A. Hi Aaron. Probably not :-(

You have probably seen rainbow coloration on mud puddles caused by a drop of oil. Oil is not the only possible cause of rainbow coloration but it probably the most likely in this instance. Is it possible that the oil removed from the parts floats to the surface of the tank such that the work passes through it and gets re-oiled as it is lifted from the tank?

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
August 2019


A. If your electrocleaning is cathodic, then you are electroplating metal impurities onto the part.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner
August 22, 2019


A. Hi Aaron,

We use an electrolytic cleaner and we sometimes see strange colours on our parts (e.g. dark grey parts look like brass). After the electrocleaning we dip the parts in acid (2% sulfuric) for about 2 seconds to neutralise the cleaner. This removes any odd colouration.

I don't know if our process is comparable to yours, but that might be something to investigate.

Ben OShea
- Katikati, New Zealand
November 21, 2019




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