Material: stainless steel duplex 2205 Duplex stainless steel 2205 provides pitting and crevice corrosion resistance superior to 316l or 317l austenitic stainless steels in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as More details about salt spray testing. Polished by hand to a mirror finish to assist in making a quality part. In the passivation process after buffing, acid and rinsing remove surface contaminants from the products and produce a hydrous oxide film which enhances corrosion resistance. Every production shipment tested and certified.