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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
finishing.com - Pine Beach, New Jersey
(Ted is available for instant or longterm help)

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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