Summary for electroless nickel machining Discussion
Electroless nickel plating can be machined? Suresh C. Mamtora asked whether EN-plated brass, mild steel, and alloy steel parts can be turned, hobbled, or otherwise machined after plating, since his shop was seeing peel-off on a 12–13 micron coating. Ted Mooney replied that grinding, diamond turning, and honing are workable, but conventional machining is probably not suitable in most cases. James Watts added that grinding and honing are common on EN when plenty of coolant is used, but heat-treated EN is basically too hard for conventional machining, and carbide or ceramic inserts often lead to failures. He suspected the shop may be taking too large a cut or generating too much heat. Watts also advised checking preplate adhesion with the most stringent test available; if the coating survives severe bend testing with only minor flaking at the break, the plating is likely sound and the problem may be in the machine shop rather than the plating.
Q. We are doing Electroless Nickel since last 4-5 years on various base metal components made from Brass, M S Alloy steel. Sir, can we do machining, turning, hobbing, etc., on Electroless Nickel plated parts? We faced a problem of peel off. Electroless Nickel is 12-13 microns. Is it advisable to machine after Electroless Nickel?
Please guide us.
Suresh C. Mamtora
Job plater – Rajkot India
July 16, 2021
A. Hi Suresh. We appended your inquiry to one of several threads here about machining of electroless nickel (please use the search engine to find others). Grinding, diamond turning, and honing are doable. Conventional machining probably not in most cases.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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July 2021
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I’m the plating manager in our plant and need help on the ENi process. We plate a high phos. Electroless nickel over carbon steel and over SS with good adhesion, but one of our clients needs to machine the parts after 25 to 50 µm. and the nickel comes off during the machining process.
What can we do ?
Any help will be appreciated. Thank you. Enrique
Enrique Segovia
– Monterrey, Mexico
Electroless nickel can even be diamond turned for the ultimate in smooth surfaces. It sounds like your electroless nickel simply doesn’t have enough adhesion and that you will need to investigate the pretreatment and plating processes.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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Need project assistance? $100/hr.
2000
2000
Grinding and honing are not uncommon on EN. With lots of coolant.
Heat treated EN is basically too hard for conventional machining. Carbide or ceramic inserts will cause a lot of failures.I suspect that they are taking large cuts and are crushing the nickel. Also, they could be generating enough heat by the wrong coolant or not enough. I would start checking my preplate quality with the most stringent adhesion test you have access to. If you can do repetitive
180 degree bends to metal failure with minor flaking at the break and no peelback, you have good EN and the problem is in the machine shop. If not, it is in your shop or a combination of both shops.
Unfortunately, plating is the whipping boy in most machine shops.
James Watts
– Navarre, Florida