The influence of impressed current density and
potential upon the nature of calcareous deposits formed . on
a cathodic steel surface has been investigated. The
experiments included potentiostatic, galvanostatic and
mixed mode combined galvanostatic and potentiostatic
techniques for affecting polarization. Specific attention
was focused upon the thickness, morphology and composition
of the deposits. A Mg 2+ depletion model has been developed
as a possible explanation for the nucleation and growth
behavior of calcareous deposits formed under combined mode
operation.