Electroplating bath containing citric acid or citrate for tin or

Details Electroplating bath containing citric acid or citrate for tin or Electroplating bath containing citric acid or citrate for tin or

1990-12-05

1992-06-02

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Depositing predominantly alloy coating

205239, 205301, 205304, C25D 332

Patent

active

051183943

ABSTRACT:
A brightener is added in the ratio of 0.5-5 g per 1 l of electric plating bath of pH 4-8 containing citric acid or citrate for tin or tin alloy plating. The brightener contains a water soluble reaction product obtained by reacting polyamine such as pentaethylenehexamine, aliphatic aldehyde such as formaldehyde, and aromatic carboxylic acid such as methyl benzoate.

REFERENCES:
patent: 3749649 (1973-07-01), Valayil
patent: 4118289 (1978-10-01), Hsu
patent: 4163700 (1979-08-01), Igarashi et al.
patent: 4530741 (1985-07-01), Rosenberg
patent: 4844780 (1989-07-01), Lee

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