抄録
Effects of mechanical deformation of steel substrates on electrodeposition of tin from stannous sulfate bath have been studied by means of microscopic examination of deposited tin nuclei.
Annealed and skin-passed cold rolled steel sheets were used for substrates for examination. The sheets had been buffed, etched with nitric and picric acid-alcohol solution, or subjected to cathodizing in alkaline solution prier to the electrodeposition.
It was found that the deformation such as tension or deep drawing had no remarkable effects on the number of nuclei formed and on the regions of nucleation spots.
These results seem to correspond well with Pick's observation in copper electrodeposition on copper substrate from copper sulfate solution; that is“Series of dislocation produced by mechanical deformation can not influence on initial formation of the deposit or on the provision of nucleation centres.”
Furthermore, it was found that tin nuclei were also formed in the interier of crystal grains of steel substrate when the steel sheet was cathodized in hot alkaline aqueous solution.
