Corrosion Behavior of Hot-Dipped Aluminized Steel Pipe in Seawater

Abstract

In order to study the corrosion performance of a hot-dipped aluminized steel pipe in the seawater, the measurements of the corrosion current for 2 weeks were performed by using the scanning vibrating electrode technique. It was found that the hot-dipped aluminized steel pipe which has no defect corrodes in the order of aluminum, Fe-Al alloy and carbon steel. But if the Fe-Al alloy layer has a defect of a penetration which gets at the base steel, the corrosion of base steel is prior to the corrosion of Fe-Al alloy.
Especially when the defect exists near weld (Type 309 stainless steel), the corrosion rate of the exposed base steel is accelerated more.