Corrosion Control of the Copper-alloy with reinforced Biofilm by Iron hydroxide

Abstract

In the clean seawater without chlorination, the protective film of copper alloy tube is biofilm. The biofilm is damaged by low chlorination, therefore the biofilm is necessary to reinforce by Fe²⁺ injection. The protective film can be evaluated by measuring polarization resistance. According to the polarization resistance value, we regulated the concentration of Fe²⁺. Here we report a result for about four years. With this method, good corrosion control and good cleanliness have been maintained.