[논문]Effects of Tungsten on the Precipitation Kinetics of Secondary Phases and the Associated Susceptibility to Pitting Corrosion in Duplex Stainless Steels

Park, Chan-Jin; Kwon, Hyuk-Sang

Effects of Tungsten on the Precipitation Kinetics of Secondary Phases and the Associated Susceptibility to Pitting Corrosion in Duplex Stainless Steels 원문보기

Corrosion science and technology, v.5 no.6, 2006년, pp.189 - 195

Park, Chan-Jin (School of Material Science and Engineering, Chonnam National University) , Kwon, Hyuk-Sang (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST))

Abstract ▼ AI-Helper

Effects of tungsten (W) on the precipitation kinetics of secondary phases and the associated resistance to pitting corrosion of 25%Cr duplex stainless steels were investigated through microstructural and electrochemical noise analyses. With the partial substitution of W for Mo in duplex stainless steel, the potential and current noises of the alloy were significantly decreased in chloride solution due to retardation of the ${\sigma}$ phase precipitation. The preferential precipitation of the $\chi$ phase in the W-containing alloy during the early period of aging contributed to retarding the precipitation of the $\sigma$ phase by depleting W and Mo along grain boundaries. In addition, the retardation of the nucleation and growth of the $\sigma$ phase in the W-containing alloy appears to be attributed to the inherently low diffusivity of W compared with that of Mo.

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문제 정의

The aim of the present study is to investigate the effects of precipitation Icinetics of secondary phases and the associated susceptibility to pitting corrosion through microstructural and electrochemical noise analyses.

가설 설정

5 cm² was coupled with a thin platinum (Ft) wire witli a tip diameter of about 100 em, and both electrodes were connected via a ZRA. Thin Pt v\dre was _냐wd as a cathode to reduce the contaminating noise from the cathode and to minimize the sliift of corrosion potential of the working electrode affected by the inert noble electode?7) Electrochemical cell was enclosed in _가shielding box composed of inner layer of styrofoam insulator and outer layer of copper shield to maintain the solution temperature and to protect the system from external noises. During the CPT measurements solution temperature was increased at a rate of 0=8 'C_。min".

제안 방법

Microstructure and phase composition of the alloy were examined, by scanning electron microscope (SEM) with back-scattering detector and by ai_걔attached electron-dispersive X-ray spectroscope (EDS).

대상 데이터

The chemical compositions of the alloys are presented in Table 1. The alloys were designed to have chemical compositions of Fe-25Cr-7Nb3Mo~0.25 N and Fe»25Cr=7Ni=3W4.5Mo- 0.25N respectively, with same PREN (42=%Cr+3.3 (%Mo+0.5%W)+30%N) value. Each alloy was named 3Mo and 3W~1.

이론/모형

6H?O solution at 60 ℃ with a sampling time of 1 s for data acquisition, and then quantitatively analyzed by the maximum entropy method (MEM).⑸ To measure the critical pitting temperature (CPT) and electrochemical noise, a zero resistance ammetry (ZRA) was used, as reported in reference.

성능/효과

2. CPTs of the 3Mo and 3W-1.5Mo alloys decreased with aging due mainly to the precipitation of 0 phase. However, the degradation of CPT was retarded for the 3W-L5Mo alloy compared with that for 3Mo alloy, resulting from the delay in the precipitation of the 0 phase by the partial substitution of Mo for W in the alloy.
3. The potential and current noises, which were asso= ciated with the initiation and the following repassivation of metastable pitting, and the corresponding PSD of 3Mo and 3W-L5Mo alloys increased with aging due to the precipitation of q phase. However, 3W=L5Mo alloy showed better resistance to the initiation of pitting corrosion than 3Mo alloy in an early period of aging due to the retardation of the precipitation of a phase.

참고문헌 (20)

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Effects of Tungsten on the Precipitation Kinetics of Secondary Phases and the Associated Susceptibility to Pitting Corrosion in Duplex Stainless Steels 원문보기

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Effects of Tungsten on the Precipitation Kinetics of Secondary Phases and the Associated Susceptibility to Pitting Corrosion in Duplex Stainless Steels 원문보기

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