Hard chrome plating chipped off
A discussion started in 2010 & continuing through 2017May 21, 2010
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?
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.
- Navarre, Florida
May 23, 2010
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.)
Consultant - Poulsbo, Washington
(Don is co-author of the
book "Plating on Plastics")
May 25, 2010
3rd Generation in Plating
Consultant - Arvika, Sweden
May 26, 2010
Q. I appreciate to your responses.
- Bandung, West Java, Indonesia
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
July 20, 2017
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.
Small Arms Factory - kanpur, UP, India
? 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.
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"
Chrome chipping in Rails of 3 piece Oil RingOctober 25, 2017
Q. 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
Engineer - Chennai, India
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