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The influence of alloying elements on metal dusting behavior of nickel chromium alloys and their statistical correlation
Author(s) -
Hattendorf Heike,
Hermse Chrétien G.M.,
IJzerman Richard M.
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.201810593
Subject(s) - chromium , metallurgy , alloy , nickel , metal , materials science , aluminium , corrosion
The focus in this study is on very metal dusting resistant nickel chromium alloys with a high content of chromium (in the range of 22 to 33 wt.%), additions of aluminum (between 0 and 3 wt.%) and variable iron content (between 0.1 and 15 wt.%). All samples were exposed up to 5693 h at 600 °C in a 37 vol.% CO, 7 vol.% CO 2 , 46 vol.% H 2 , 9 vol.% H 2 O atmosphere at a total pressure 20 bar. The differences between the samples in terms of mass loss, pit depth and incubation time to first pit are evaluated by a statistical analysis and discussed in dependence of alloy composition. Only samples with combined chromium plus aluminum content of about 30 wt.% or more and an iron content of 0.6 wt.% or less do not show any pit formation during the exposure time, even on the edges. In contrast, samples with a similar combined chromium plus aluminum content, but with a higher iron content, do show pit formation due to metal dusting corrosion.