Metal finishing Q&As since 1989

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Plating defects

adv.    

March 18, 2009

in our hard chrome plating plant we are facing severe problems like peel off, rough finish, builtup, etc, of which rough finish has the highest rejection percentage.
could any one help me in this regard
thanking u

Prabhu G
- India

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March 18, 2009

Hi, Prabhu. It sounds like you are looking for a troubleshooting book for hard chrome plating. Guffie's "Hard Chromium Plating" should be pretty close to what you need to sort through this long laundry list of defects. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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March 20, 2009

PEEL OFF IS BECAUSE OF POOR SURFACE PREPARATION.
OIL FREE SURFACE SHOULD BE FIRST ETCHED IN CHROMIC ACID FOR 30 SECS. THEN CHROME PLATED.
ROUGHNESS IS BECAUSE OF LOW TEMP. LOW CONC. OF CHROMIC ACID.
BURNING IS BECAUSE OF HIGH CURRENT USE PROPER SHIELDS AT HIGH CURRENT DENSITY AREA.
IN CHROME PLATING YOU CAN PASS CURRENT FROM 100AMP/SQFEET TO 600 AMP/SQ FEET OF CURRENT.
YOU CAN PLATE ONE MICRON IN ONE MINUTE.
ANODE PURE LEAD OR UPTO 10% TIN CAN BE MIXED.
I WILL SUGGEST YOU TO CONSULT A CHEMICAL SUPPLIER IN YOUR CITY AND DISCUSS WITH HIM ABOUT YOUR REQUIREMENT.
THANKS,

Ajay Raina
Ludhiana, Punjab, India

adv.