Bismuth composition, method of electroplating a tin-bismuth alloy and electroplating bath therefor

摘要

An improved electrotinplating process and acidic electroplating bath therefor is disclosed. The acidic electroplating bath contains tin ions and a chelate salt comprising an acid bismuth sulfate gluconate. An improved electrotinplating process is therefore provided which produces an electroplated tin-bismuth alloy which is resistant to the effects of tin pest and the formation of tin whiskers.