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Toward Understanding the Effects of Strain and Chloride Deposition Density on Atmospheric Chloride-Induced Stress Corrosion Cracking of Type 304 Austenitic Stainless Steel Under MgCl2 and FeCl3:MgCl2 Droplets
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
Univ Manchester, Corros & Protect Ctr, Sackville St, Manchester M13 9PL, Lancs, England.;Univ Manchester, Mat Performance Ctr, Sch Mat, Sackville St, Manchester M13 9PL, Lancs, England..
2019 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 75, no 2, p. 167-182Article in journal (Refereed) Published
Abstract [en]

Type 304 (UNS S30400) austenitic stainless steel was exposed for 6 months under elastic (0.1%) and elastic/plastic (0.2%) strain to MgCl2 and mixed MgCl2:FeCl3 droplets with varying chloride deposition densities (1.5 mu g/cm(2)-1,500 mu g/cm(2)) at 30% relative humidity (RH) and 50 degrees C. The occurrence of pitting corrosion, crevice corrosion, atmospheric chloride-induced stress corrosion cracking (AISCC), and hydrogen embrittlement (HE) was observed, and the average crack growth rates estimated. Exposure to elastic/plastic strain resulted in longer and more severe cracks. AISCC was found at chloride deposition densities down to 14.5 mu g/cm(2), whereas no cracks were seen at lower deposition densities, with cracks developing at pit or crevice corrosion sites. More severe cracks were seen under MgCl2 droplets as contrasted to mixed MgCl2:FeCl3 salt droplets, which were seen to promote more localized corrosion sites with deeper penetration and in conjunction with shorter crack lengths. Differences in AISCC propagation rates and associated crack morphologies are discussed in relation to understanding long-term atmospheric corrosion exposures.

Place, publisher, year, edition, pages
NATL ASSOC CORROSION ENG , 2019. Vol. 75, no 2, p. 167-182
Keywords [en]
atmospheric-induced stress corrosion cracking, austenitic stainless steel, ferric chloride (FeCl3), hydrogen embrittlement, magnesium chloride (MgCl2), nuclear waste storage
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-244105DOI: 10.5006/3026ISI: 000456870100009OAI: oai:DiVA.org:kth-244105DiVA, id: diva2:1289797
Funder
Swedish Research Council, 2015-04490
Note

QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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