Underprotection of Mild Steel in Seawater, the Calcareous Film

摘要

In the situation of underprotection of mild steel in sea water, we are in the situation between the corrosion potential and the protection potential. We will describe an experimental investigation to look at this situation. Constant current and constant potential methods have been employed together with weight loss, impedance analysis and SEM/EDX, to look at calcareous film growth. Models explaining the behaviour in a variety of situations will be presented.