Corrosion and Prevention of HDR Duplex Stainless Steel in Seawater Pipeline

Electrochemical methods were used to study the corrosive characteristics of HDR duplex stainless steel in simulated seawater. The results showed that the corrosive potential and pitting potential of HDR duplex stainless steel were relatively positive, and the steel had favorable corrosive characteristic. When the steel is electrically with other common materials, serious galvanic corrosion will occur, because of the potential difference between HDR duplex stainless steel and other materials such as carbon steel, cast iron and brass. The key for prevending galvanic corrosion is effective and complete electric insulation between HDR duplex stainless steel and accessories made of other materials can solve corrosion in seawater pipeline system of HDR duplex stainless steel.