Effects of the precipitation of secondary phases on the erosion-corrosion of 25% Cr duplex stainless steel. (15th May 2019)

• Record Type: Journal Article
• Authors: Kim, Young-Jae; Kim, Su-Won; Kim, Han-Byeol; Park, Choong-Nyeon; Choi, Yun-Il; Park, Chan-Jin
• Is Part Of: Corrosion science. Volume 152(2019)
• Page Start: 202
• Page End: 210
• Publication Date: 2019-05-15
• Subjects: A. Stainless Steel -- B. Erosion -- B. Polarization -- C. Passivity; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.03.006
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The effects of aging at 850 °C on the precipitation of secondary phases and the erosion-corrosion behavior of 25% Cr duplex stainless steel were studied. An aging time of 30 min is regarded as a boundary aging condition for erosion-corrosion. A current density response of ˜0.8 mA cm −2 is considered to be a criterion for surface depassivation after the initial erosion-corrosion. Abstract: This study examined the effect of aging at 850 °C on the precipitation of secondary phases and the resultant erosion-corrosion behavior of 25% Cr duplex stainless steels (DSS). An aging time of 30 min, which led to a ratio of reactivation current to activation current ( ir /ia × 100) of ˜1% in a DL-EPR test and a current density of ˜0.8 mA cm −2 at 9 m s −1 in a jet impingement test, is regarded as a boundary aging condition for erosion-corrosion. Further, the current density response of ˜0.8 mA cm −2 can be considered a criterion for the surface depassivation resulting from erosion-corrosion.