Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel

被引：28

作者：

Amatsuka, Shuichiro ^{[1
]}

Nishimoto, Masashi ^{[1
]}

Muto, Izumi ^{[1
]}

Kawamori, Makoto ^{[2
]}

Takara, Yuya ^{[2
]}

Sugawara, Yu ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, 6-6-02 Aza Aoba, Aoba Ku, Sendai 9808579, Japan

[2] Kobe Steel Ltd, Kobe Corp Res Labs, 5-5, Takatsukadai 1 Chome, Nishi Ku, Kobe, Hyogo 6512271, Japan

来源：

NPJ MATERIALS DEGRADATION | 2023年 / 7卷 / 01期

关键词：

SIGMA-PHASE PRECIPITATION; PITTING CORROSION-RESISTANCE; HEAT-AFFECTED ZONE; MICROSTRUCTURE EVOLUTION; MNS INCLUSIONS; MICROELECTROCHEMICAL MEASUREMENTS; TREATMENT TEMPERATURE; BEHAVIOR; DISSOLUTION; SIZE;

D O I：

10.1038/s41529-023-00335-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An aging treatment of UNS S32750 super duplex stainless steel at 1173 K for 1.0 ks produced sigma and secondary austenite (gamma(2)) phases in the alpha and gamma phase boundary regions. Small amount of Mn-Cr oxide and MnS complex inclusions were present in the steel. No pitting was observed during the potentiodynamic polarization of a small area (200 x 200 mu m) without inclusions in 1 M MgCl2 at 348 K. Because the electrode area included alpha, gamma, sigma, and gamma(2) phases, these phases and their boundaries alone could not act as initiation sites for pitting. The electrode area size was gradually reduced from 3 x 3 mm to 1 x 1 mm, and pitting corrosion was observed to occur at the Mn-Cr oxide and MnS complex inclusions in a region that appeared to be the gamma(2) phase near the sigma phase.

引用

页数：10

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