In:
Materials and Corrosion, Wiley, Vol. 73, No. 10 ( 2022-10), p. 1644-1656
Abstract:
The corrosion law of X80 steel in silty soils with different contents of sodium chloride and sodium sulfate is studied at different temperatures by using an orthogonal test group of three factors and three levels L 9 (3 4 ) in conjunction with the results of electrochemical impedance spectroscopy, polarization curve, and microscopic images. The steel corrosion rate increases with the silty soil temperature. The presence of SO 4 2 − in silty soil inhibits corrosion in X80 steel. The corrosion mechanism involves competition between Cl − and SO 4 2 − for adsorption sites: SO 4 2 − ions occupy some corrosion pits, and FeS and other corrosion products are generated and adhere to the surface of the corrosion pits, inhibiting further reaction. A range analysis of the fitted electrochemical impedance spectra and polarization curves of X80 steel shows that the temperature has the strongest effect on the corrosion of X80 steel, followed by the Cl − content, whereas the SO 4 2 − content has the least effect. The lowest corrosion rate is found for a silty soil Cl − content of 0.3%, a SO 4 2 − content of 2.0%, and a temperature of −20°C.
Type of Medium:
Online Resource
ISSN:
0947-5117
,
1521-4176
DOI:
10.1002/maco.202213150
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
1481051-7
detail.hit.zdb_id:
1224916-6
detail.hit.zdb_id:
202688-0
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