Summary for hard chrome plating chipped off Discussion
hard chrome plating chipped off appears to be tied more to edge condition and post-plating finishing than to masking or rinse control alone. Adi Nugraha described chrome peeling at the tip of a stainless trunnion after the plated edge was polished into a radius, and later noted a bulb or hollow at the edge after plating. Don Baudrand and others did not identify a single definitive test for peel risk in the excerpt, but the discussion points toward geometry, local buildup, and finishing damage. Mahendra Gargatti said the fault likely lies in the post-plating grinding operation, recommending a specific grinding wheel, plenty of coolant, and not starting the grind at the plated edge; instead, plunge slightly inside and cut outward. In a later related question about barrel bore chip-off, the reply asked for the base metal grade first, implying substrate details matter before diagnosing the cause.
adv.
Q. Q.I’m from Bangalore and we do hard chrome plating for piston rods.
We are facing chip off issue at the chamfer edges.
Base material is C45.
Can you anybody please help to come out from this problem.
Raham Thulla
Employee – Bangalore, India
December 30, 2019
A. Your fixturing is wrong.Consult somebody who is experienced in HARD CHROME plating.
Avinash Vidhate
– Maharashtra, India
A. I think it’s a problem with the pre-worked piece. It happens to us on stainless steel pistons when the seat for the chrome plating is not well radiated.
In rectification this problem is encountered.
Andrea Mar
– italia
August 31, 2022
⇩ Similar, related, Q&As — oldest first ⇩
Q. I have a problem with the trunion of Chromed part. The tip of the trunnion has been peeled off, more clearly when the tip of the chrome was polished to form a radius at the tip precisely at the end of the chamfer. Material is Stainless.
I have done several actions, but the results still exist, for example:
Modification to the masking equipment,
Controlling the rinsing solutions,
Changing the method of current flow,
Controlling the anode and cathode.
My Question is:
for hard chrome plating is there any method for checking against the surface which has the possibility of peeling, if any, whether the method should be used?
What exactly is causing the hard chrome peeling?
Adi Nugraha
Quality Engineer – West Java, Bandung, Indonesia
May 21, 2010
 | A. I would call that “edge chipping”. The first fix that I would try is to put a much larger radius on the corner lip of the part. James Watts A. I believe that to get really good adhesion of hard chromium to stainless a Woods nickel strike is required. Nickel chloride 240 and HCl 250 mL/L, 3-10 A/dm2 (30-100 A/sq ft.)
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| A. Hi, A grinding operation should not remove the chrome from the part. Try to activate the part in the chrome solution 1,8 Amp / dm2 for 5 minutes go to 2,5 Amp/dm2 for 5 minutes after that ramp it up to 35 Amp/ dm2 or what your parameters is. If you etch in a another chrome solution don’t rinse the part before the plating solution. The most important it to do a correct activation is in the chrome to get a good adhesion. Best regards
Q. I appreciate your responses. Adi Nugraha [returning] |
A. From what I see, I am of the view that the fault lies in post plating grinding operation; use specific grinding wheel with lots of coolant as there is a lot of localised heat that is generated when you grind, and lastly: Never start Grinding from the beginning of plating but plunge the wheel a few mm inside and take a cut inside out. Good luck.
Mahendra Gargatti
– BELGAUM, KARNATAKA, India
Q. Hello Everyone.
We are into hard chrome plating of barrel bore of small arms. We are facing a problem of chip-off when the gun is fired. Can someone kindly suggest the cause of this and remedial measures that can be taken.
Sahil Arora
Small Arms Factory – kanpur, UP, India
July 20, 2017
? Hi cousin Sahil. I think you probably need to start by telling us whether the barrels are aluminum (what grade), stainless (what grade), or carbon steel (what grade). Thanks.
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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Chrome chipping in Rails of 3 piece Oil Ring
Q. I work in a firm where we manufacture piston rings. We are facing an issue of chrome chipping in Side Rails of 3 piece Oil rings. We assemble the rings in the form of mandrel. our bath is sulphate bath. We use ultrasonic and jet wash for initial cleaning and we also have a separate tank for etching.
Bath density – 18 Bé to 22 Bé
Current density – 4 ASI
Temp – 58-62 °C
Balaji tv
Engineer – Chennai, India
October 25, 2017
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