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CHROME DOTS OBSERVED AFTER PLATING

WE ARE BASKET MANUFACTURING COMPANY PLATING NICKEL CHROME (DUPLEX NICKEL) ON STAINLESS STEEL(201 GRADE)

PROCESS SEQUENCE: HCl - SOAK-ANODIC DEGREASE-ETCHING(H2S04)-HCL(10%)-NI.STRIKE-
--DUPLEX NICKEL(10-12 MICRONS)-DEC.CHROME-DRAGOUT-NEUTRALISER-RINSE- --RINSE-- HOT WATER RINSE--DRY.

I am observing rust spots after 4-5hours after plating.

noil fonseka
PRODUCTION ENGG. - COLOMBO, SRI LANKA
July 11, 2008

July 11, 2008

Hi, Noil. You shouldn't be observing rust spots 4-5 years after duplex nickel and chrome on stainless. After final rinsing, swish a few in a bucket of DI or distilled water to see if there is something grossly wrong with your rinse water.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey

Hi , the only explanation I can think of is that the parts you are plating are porous and will need to be better rinsed . try dipping a part in a caustic solution to see if the spots disapear . it must be chrome spotting out and not rust , as the part is s/s .

hope this helps

Jay Smith
- Essex, UK
July 13, 2008

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