Electrochemical scaling of stainless steel in artificial seawater: Role of experimental conditions on CaCO3 and Mg(OH)2 formation

In seawater, during the application of cathodic protection, a scale layer forms on the metal surface. As function of its chemical composition and compactness, it can improve the metal protection against corrosion by reducing the oxygen diffusion. The present investigation focuses on the electrochemi...

Full description

Saved in:
Bibliographic Details
Published in:Desalination 2013-02, Vol.311, p.234-240
Main Authors: Karoui, Héla, Riffault, Benoit, Jeannin, Marc, Kahoul, Abdelkarim, Gil, Otavio, Ben Amor, Mohamed, Tlili, Mohamed M.
Format: Article
Language:English
Subjects:
Applied sciences
Brucite
Calcium carbonate
Corrosion prevention
Engineering Sciences
Exact sciences and technology
Interstices
Magnesium hydroxide
Materials
Natural water pollution
Pollution
Scale (corrosion)
Scaling
Sea water
Seawater
Seawaters, estuaries
Stainless Steel
Stainless steels
Water treatment and pollution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In seawater, during the application of cathodic protection, a scale layer forms on the metal surface. As function of its chemical composition and compactness, it can improve the metal protection against corrosion by reducing the oxygen diffusion. The present investigation focuses on the electrochemical scaling of stainless steel in artificial seawater. Formed scales were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy. It was found that the formed scales are mainly CaCO3 aragonite. The brucite (Mg(OH)2) was identified, as a component of the scale layer, only for a high temperature and a more cathodic potential. It was also shown that, unlike other substrates, stainless steel promotes the precipitation of brucite. If the experimental conditions favoured its formation, the scaling process starts with brucite deposition. The growth of CaCO3 nucleuses, developed on interstice, recovers after brucite layer. ► Unlike other substrates, stainless steel promotes Mg(OH)2 electrochemical scale. ► The temperature favours the brucite formation on stainless steel. ► Scaling process starts by brucite formation; then, the aragonite occurs on it.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2012.07.011