On the Mechanism of Cathodic Crystal Growth Processes

Abstract
An electron diffraction and electron microscopic study on thin films of copper electrodeposited on clean 1 mil foils of copper and platinum from acid‐copper and complex copper‐glycine baths maintained at 25 °C has been conducted. The foils of copper and platinum consist of small grained structure. Results show that for a current density of 10 ma/cm2 and high acidic conditions (pH 0.3 or 0.9), large crystal grains of copper (10–40µ) are developed, even when the deposit thickness is very small. A limited study on the effect of current density on the orientation of nickel, electrodeposited mainly on brass disks from some common plating solutions maintained at 25 °C, has also been carried out. Results are discussed in light of existing mechanisms for the cathodic crystal growth process.

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