Chemistry: electrical and wave energy – Processes and products
Patent
1987-01-15
1987-12-08
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
20412975, C25D 536, C25F 306
Patent
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
Corsentino John A.
Martyak Nicholas M.
McMullen Warren H.
Bright R.
M&T Chemicals Inc.
Parker S. H.
Tufariello T. M.
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