A Trial on Cathodic Protection of Sea-Water Tank. (IV)

Testing on the Characteristics of the Coatings Obtained by the Amalgamated Aluminum and Zinc Main Anodes

Abstract

The characteristics of the coatings, resulted in the experiment described in the previous report were examined.
The average potential of -980mV (referred to saturated calomel) was observed over the coated surface with the cathodic current of 36mA/m². Fairly negative potentials were still maintained when the current was stopped for a long time. In spite of the interruption of current for more than 70 days, including the period of exposing the coatings to dry air for a week, the necessary current for complete protection was found to be only 20mA per sq·meter.