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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Can the Corrosion process be stopped?Can the Corrosion process be stopped?
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10/18/2005 9:00 AM
 
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If you have metal that is corroding due to the presence of chloride, can the process be stopped? Can you apply something to lower the Acidity%5CPH and stop the corrosion? Thanks Chris
 
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10/18/2005 9:00 AM
 
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Corrosion is a nature's and God's rule - you can not stop it in absolute term but you can definitely minimise and control it to definite extent which is called gurantee. If the root cause is Chloride -- try to minimise it by controlling inlet chemistry by some chemical neutralisation and checks or by some other suitable process controls Secondly you can apply non-chlorine based high solid Epoxy or PU which are having very very low water vapour transmission rate i.e. negligible permeability and you can get some definite relief. But at the same time you have to be cautious about contaminations and reaction between paint and process chemical which can be best dictated by your Process Engineer and Paint Manufacturer. regards DM
 
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10/24/2005 9:00 AM
 
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In an electrochemical corrosion cell you always have a cathode and an anode. Oxidation takes place at the anode while reduction takes place at the cathode. The anode lost electrons, which are attracted to the cathode trough the metallic per curs. Cations Fe++ are attracted to the cathode, into the electrolyte and the anode oxidizes. Fe++ combines with Cl2- and 2H2O to form Fe (OH) 2 and 2H+Cl-, Cathode reduces and hydrogen is produced. At the cathode the following reaction takes place 2H+CL-+Fe++ to give Fe++Cl- and 2H+. The pH lowers more and more the corrosion process never ands. The use of amine neutralizers to lower pH would be useful. Alternatively you can do a material upgrade with a metallurgy resistant to chlorides. Regards Luis Marques
 
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