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Study of the Fe(II-III) hydroxysalts transformation according to the pH and the concentration of the ions present

Farida Termemil, Marwa Ahmed-Malek, Assia Bourouba, Mohamed-rida Benloucif

Abstract


Sulphated green rust, GR (SO42-), is one of the main corrosion products of carbon steel in marine environments. It is Fe (II)-Fe(III) hydroxylsalt in sheets, consisting of alternating layers of iron-hydroxide type, loaded positively due to the presence of the cations and negative interlayers consisting of anions and water molecules. This compound is strongly associated with the metabolism of sulphate-reducing bacteria, and can also evolve under cathodic protection. Thus, recently, GR (CO32-) has been detected in place of GR (SO42-) on already corroded ordinary steel, newly subjected to cathodic protection. This presence is due to the pH and conditions imposed by the cathodic protection. In this paper, we chemically synthesize sulfated and carbonate green rust in a chlorinated medium; we then study their respective transformation according to the concentration [SO42-] / [HCO3-] ratio and pH. Our results show that from a GR (SO42-), GR (CO32-) is formed from a pH ≥8.2 for [SO42-] / [HCO3-] = 12 and without any change in pH for [SO42-] / [HCO3-] <12. Whereas from GR (CO32-), GR (SO42-) is formed for [SO42-] / [HCO3-] > 1 without any change in pH. 


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References


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DOI: http://dx.doi.org/10.13171/mjc751912081134ft

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