Letter 31938

Is cadmium plating prohibited  

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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

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

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