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Long‐term low‐temperature hot corrosion of PTA welded René 41 superalloy under marine‐like conditions
Author(s) -
Hempel Christian,
Mandel Marcel,
Schimpf Christian,
Krüger Lutz
Publication year - 2022
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202213053
Subject(s) - corrosion , superalloy , metallurgy , materials science , welding , carbon steel , high temperature corrosion , salt (chemistry) , chemistry , microstructure
The hot corrosion behavior of plasma transferred arc (PTA) welded René 41 in NaCl, NaVO 3 , Na 2 SO 4 , and a salt mixture of 87.5 wt% Na 2 SO 4 + 5 wt% NaCl + 7.5 wt% NaVO 3 was investigated at 600°C. The single‐salt experiments were carried out to identify specific corrosion characteristics and to provide insights into and, thus, an understanding of the corresponding corrosion processes. NaVO 3 and NaCl showed strong corrosive effects, while Na 2 SO 4 proved less corrosive. Long‐term experiments were carried out to simulate real machine operating conditions. After cyclic studies with repeated changes in temperature, the deep and local corrosive attack became apparent, which is characteristic for low‐temperature hot corrosion.