Inherent Corrosion Resistance and Response to Cathodic Protection in Seawater of Recently Developed Stainless Steel Alloys.
NAVAL RESEARCH LAB WASHINGTON D C
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Stainless steel alloys 24Ni-20Cr-6.5Mo, 26Cr-1M0, 22Cr-13Ni-5Mn, and Type 216 stainless steel werre studied for inherent corrosion resistance in quiescent and slowly moving seawater. The response of these alloys to two levels of cathodic protection mild steel and zinc anodes was also studied. None of the alloys was completely resistant to corrosion. Most were quite susceptible to crevice corrosion, but two unprotected specimens of 24Ni-20Cr-6.5Mo stainless steel had excellent resistance in both exposure conditions. These specimens exhibited relatively noble freely corroding electrochemical potentials over an extended period. Cathodic protection with either mild steel Fe or zinc Zn anodes prevented crevice corrosion, but the 26Cr-1Mo and 22Cr-13Ni-5Mn stainless steels showed some edge corrosion and corrosion under the mild steel anode, respectively, when polarized to the potential of mild steel. Author
- Properties of Metals and Alloys
- Fabrication Metallurgy
- Marine Engineering