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INHERENT CORROSION RESISTANCE AND RESPONSE TO CATHODIC PROTECTION IN SEAWATER OF RECENTLY DEVELOPED STAINLESS STEEL ALLOYS

T. J. Lennox, M. H. Peterson

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Abstract

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)

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What this paper is about

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)

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Available abstract

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)

Key concepts: Cathodic protection, Corrosion, Metallurgy, Crevice corrosion, Materials science, Seawater, Anode, Galvanic anode

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INHERENT CORROSION RESISTANCE AND RESPONSE TO CATHODIC PROTECTION IN SEAWATER OF RECENTLY DEVELOPED STAINLESS STEEL ALLOYS — Research Paper | ScholarLens