Activation composition and method for forming adherent chromium

Chemistry: electrical and wave energy – Processes and products

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20412975, C25D 536, C25F 306

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active

047117052

ABSTRACT:
An activation composition and method for producing chromium electrodeposits having excellent adhesion on both soft and hardened ferrous substrates from high energy efficient chromium baths is described. The activation composition is a solution containing iodate and fluoroborate ions, optionally with cerium ion as a stabilizer. The method includes electrolytically etching the substrate in the activation solution, preceded or followed by reverse etching in chromic acid. The chromium electrodeposit can be carried out effectively to provide the desired adherent deposit from a high energy efficient (HEEF) chromium plating bath.

REFERENCES:
patent: 4163701 (1979-08-01), Schepacz
patent: 4585530 (1986-04-01), McMullen
patent: 4619742 (1986-10-01), Pliefke

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