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In-situ synchrotron studies of the effect of nitrate on iron artificial pits in chloride solutions: I. On the structures of salt layers
Authors:
Weichen
Xu
(University of Birmingham)
,
Steven
Street
(University of Birmingham)
,
Mahrez
Amri
(DTU Riso)
,
Fred
Mosselmans
(Diamond Light Source)
,
Paul
Quinn
(Diamond Light Source)
,
Trevor
Rayment
(Diamond Light Source)
,
Alison
Davenport
(University of Birmingham)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of The Electrochemical Society
, VOL 162 (6)
, PAGES C238 - C242
State:
Published (Approved)
Published:
February 2015

Abstract: The effect of nitrate on the salt layers in iron artificial corrosion pits in acidic chloride solutions has been studied using in-situ synchrotron X-ray diffraction. During dissolution in 1 M HCl, there is a salt layer of FeCl2.4H2O on the electrode surface, which is isotropic. With addition of trace nitrate, the salt layer remains FeCl2.4H2O and no nitrate phase is observed, but the diffraction pattern becomes anisotropic, consistent with the formation of platelets with (1 2 0) planes settling horizontally. In nitrate solution containing trace of chloride (0.1 M HNO3 + 10 mM HCl), a salt layer is formed that is isostructural with Co(NO3)2.6H2O, and therefore assumed to be Fe(NO3)2.6H2O. This is the first reported crystal structure of ferrous nitrate. The salt layer is also found to give an anisotropic diffraction pattern, consistent formation of platelets with (0 2 0) planes settling horizontally.
Subject Areas:
Chemistry,
Materials
Instruments:
I18-Microfocus Spectroscopy
Added On:
23/03/2015 11:09
Discipline Tags:
Physical Chemistry
Chemistry
Corrosion
Materials Science
Technical Tags:
Diffraction
microXRD