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The influence of NaCl and CaCl 2 induced high temperature corrosion on the aqueous corrosion resistance of stainless steels
Author(s) -
Mori Gregor,
Vidic Karl J.,
Bucher Edith,
Yasir Muhammad,
Hornauer Daniel,
Nachtnebel Manfred,
Fitzek Harald,
Schroettner Hartmuth
Publication year - 2019
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.201810451
Subject(s) - corrosion , materials science , metallurgy , oxide , metal , alloy , aqueous solution , chloride , chromium , high temperature corrosion , salt (chemistry) , chemistry
The corrosion resistance of the steel grades 1.4509 and 1.4301 against sodium and calcium chloride, at 650 and 750 °C is investigated by means of cyclic exposure tests (CETs) in dry air. The formation of chromates as well as volatile metal chlorides and oxychlorides leads to non‐protective oxide scales on both steel grades. At 650 and 750 °C and in presence of a salt layer the alloy 1.4301 shows a higher corrosion resistance than the material 1.4509. At 750 °C and in presence of salt, the surface of the steel grade 1.4301 is transformed from a face centered cubic (fcc) to a body centered cubic (bcc) lattice, due to corrosion induced de‐alloying. The surfaces of both tested materials deplete in chromium, especially at 750 °C. Consequently, the corrosion resistance of the materials exposed to CET decreases sharply in aqueous corrodants.