Electrochemical impedance study on the formation of biological iron phosphate layers

article



Breur, H.J.A.

Wit, J.H.W. de

Turnhout, J. van

Ferrari, G.M.
Phosphating is the most commonly applied pre-treatment process. However, some disadvantages exist: heavy metals and phosphoric acid are used in the process. Volkland et al. developed a process, in which these compounds can be left out, using bacteria to activate the phosphating process. This paper addresses the analysis of this phosphating process using electrochemical impedance spectroscopy. EIS-measurements are carried out during 150 h to understand the electrochemical processes taking place during the phosphate formation. A model is derived that can explain the processes. The process appears to be a two-step adsorption process. The first step is formation of a thin layer of bacterial products. Formation of a dense layer of iron phosphates as a second step takes place within 2 days. © 2002 Elsevier Science Ltd. All rights reserved.
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BacteriaBioprotectionCorrosion protectionEISPhosphatingPseudomonas putidaAdsorptionBacteriaCorrosion protectionElectric impedanceHeavy metalsIron compoundsPhosphatesPhosphoric acidSpectroscopyBioprotectionElectrochemistry
TNO Identifier
236553
Repository link
https://resolver.tno.nl/uuid:59e07bc3-82ae-4d95-ab1a-c999d44336ee
ISSN
00134686
Source
Electrochimica Acta, 47(13-14), pp. 2289-2295.
Pages
2289-2295
Files
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