Localized Corrosion Behavior of High Nitrogen-bearing Austenitic Stainless Steels in Seawater Environment
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概要
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Crevice corrosion behavior of high nitrogen-bearing stainless steels with up to 1.1 mass% nitrogen were investigated in artificial seawater. Specimens were highly purified and contained ultra-high nitrogen of about 1 mass% obtained by using nitrogen gas pressurized electroslag remelting (P-ESR) system. 23%Cr-4%Ni-0 to 2%Mo-0.7 to 1.1%N stainless steels were used as test specimens. Crevice corrosion resistant properties of the stainless steels were evaluated by means of electrochemical corrosion test method using multiple crevice assemblies. Crevice corrosion was confirmed by visual observation to be generated after test and by in-situ current response under test. It was seen that there was a positive correlation between nitrogen content and crevice corrosion potential. High nitrogen-bearing austenitic stainless steels produced by P-ESR had good crevice corrosion resistance. It was also found that ultra-high nitrogen stainless steels containing molybdenum had superior crevice corrosion resistance. Surface of high nitrogen stainless steel was analyzed using X-ray photoelectron spectroscopy (XPS). After polarization at the passive potential region (at +300 mV vs. SCE), an alloying nitrogen or nitride peak of N1s spectra appeared at higher take-off angle measurement, indicating that nitrogen concentrated at the inner layer of the interface between passive film and bulk metal. Enriched nitrogen at the interface may be possible to improve crevice corrosion resistance.
- 社団法人 日本鉄鋼協会の論文
- 2003-05-15
著者
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Kodama Toshiaki
Materials Information Technology Station National Institute For Materials Science
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KATADA Yasuyuki
Fuel Cell Materials Center, National Institute for Materials Science
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KATADA Yasuyuki
Steel Research Center, National Institute for Materials Science
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SAGARA Masayuki
Steel Research Center, National Institute for Materials Science
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Sagara Masayuki
Steel Research Center National Institute For Materials Science
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Katada Yasuyuki
Steel Research Center National Institute For Materials Science
関連論文
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- Characterization of the Surface Oxide Film of Nickel-free Austenitic Stainless Steel Located in Simulated Body Environments
- Localized Corrosion Behavior of High Nitrogen-bearing Austenitic Stainless Steels in Seawater Environment
- Effect of Nitrogen on Crevice Corrosion and Repassivation Behavior of Austenitic Stainless Steel
- Chromium Nitride Precipitation Behavior in Weld Heat-affected Zone of High Nitrogen Stainless Steel
- Corrosion Behavior of Nickel-Free High Nitrogen Austenitic Stainless Steel in Simulated Biological Environments