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Investigation of the Localized Corrosion and Passive Behavior of Type 304 Stainless Steels with 0.2?1.8 wt % B.

ABSTRACT: The pitting corrosion resistance and passive behavior of type 304 borated stainless steels (Febalance?18Cr?12Ni?1.5Mn?(0.19, 0.78, and 1.76 wt %)B) manufactured through conventional ingot metallurgy were investigated. The alloys were composed of an austenitic matrix and Cr?B phase, and the volume fraction of Cr?B increased from 1.68 to 22.66 vol % as the B content increased from 0.19 to 1.76 wt %. Potentiodynamic polarization tests measured in aqueous NaCl solutions revealed that the pitting corrosion resistance was reduced as the B content increased and the pits were initiated at the matrix adjacent to the Cr?B phase. It was found that the reduced resistance to pitting corrosion by B addition was due to the formation of more defective and thinner passive film and increased pit initiation sites in the matrix.

SUBMITTER: Ha HY

PROVIDER: S-EPMC6267041 | biostudies-other | 2018 Oct

REPOSITORIES: biostudies-other

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Investigation of the Localized Corrosion and Passive Behavior of Type 304 Stainless Steels with 0.2⁻1.8 wt % B.

Ha Heon-Young HY Jang Jae Hoon JH Lee Tae-Ho TH Won Chihyoung C Lee Chang-Hoon CH Moon Joonoh J Lee Chang-Geun CG

Materials (Basel, Switzerland) 20181025 11

The pitting corrosion resistance and passive behavior of type 304 borated stainless steels (Fe<sub>balance</sub>⁻18Cr⁻12Ni⁻1.5Mn⁻(0.19, 0.78, and 1.76 wt %)B) manufactured through conventional ingot metallurgy were investigated. The alloys were composed of an austenitic matrix and Cr₂B phase, and the volume fraction of Cr₂B increased from 1.68 to 22.66 vol % as the B content increased from 0.19 to 1.76 wt %. Potentiodynamic polarization tests measured in aqueous NaCl solutions revealed that the ...[more]

PMID: 30366447

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