Critical Protection Potentials and Ranges

In this section a survey is given of the critical protection potentials as well as the critical potential ranges for a possible application of electrochemical protection. The compilation is divided into four groups for both cathodic and anodic protection with and without a limitation of the protection range to more negative or more positive potentials respectively. 

Protection potentials and protection potential ranges for important systems 

Group System Material System Medium Cu-CuS04 Notes/References 

I U U Eq. (2-39) Plain carbon and low-alloy ferrous materials Neutral waters, saline and soil solutions (25°C) -0.53 -0.85 Protection against weight loss corrosion Fig. 2-9 [29-34] (with film formation is more positive) 

II Plain carbon and low-alloy Seawater -0.53/ -0.85/ Protection for thin films and 

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