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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Is cadmium plating prohibited; how to identify it?

Q. I NEED TO KNOW WHETHER CADMIUM PLATING IS PROHIBITED.

SECONDLY I NEED TO KNOW WHAT WILL BE THE COLOUR OF THE COATING AND HOW WE CAN FIND OUT WHTHER IT IS CADMIUM COATED OR NOT. WE USE THIS COATING FOR FASTENERS.

REGARDS

P.NALLASIVAM
Material Engineer,
Procurement Dept.

NALLASIVAM PARAMASIVAM
MARITIME SERVICES -SHARJAH, UNITED ARAB EMIRATES
2004

A. Cd is prohibited in some countries and some not so this question depends on where the product is going. Color can be silvery grey or yellow if chromate conversion treated.

A spot test is: place one drop of conc. nitric acid on surface, after 1 min. one drop 10M sodium hydroxide to neutralize. Add one drop ammonium sulfide solution, deep orange precipitate indicates Cd.

JAN SOROKA
LOCKHEED - DALLAS, Texas
2004

Q. We want technical support about ban of cadmium electroplating in India.

D K JAIN
- BHOPAL MP INDIA
August 13, 2013

How to separate cadmium and tin anodes

Q. I have old anodes of tin and cadmium. How to differentiate between them practically?

Fahad hashim
- UAE,DUBAI
November 2, 2016

A. Hi Fahad. Cadmium is 18-19% heavier than tin. You should be able to do a quick first check by weighing them. If they clearly sort into two piles, you can then verify with the spot test previously mentioned. Good luck.

Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
November 2016

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