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51315-5642-Effects of Chemical Treatment on the Corrosion Behavior of Magnesium Anode in the Potable Water Tank

Picture for Effects of Chemical Treatment on the Corrosion Behavior of Magnesium Anode in the Potable Water Tank
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Product Number: 51315-5642-SG
ISBN: 5642 2015 CP
Author: KyungJin Park
Publication Date: 2015
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$20.00
$20.00
Magnesium is widely used as anode material for PWTs (Potable Water Tanks) in the offshore structures because it has excellent corrosion protection performance and is harmless to human body. However magnesium anodes installed in the PWT sometimes corrode with an abnormally high corrosion rate leading to pH increase (>pH10) andhydrogen accumulation in the tanks which decrease the water quality and lifetime of anodes.Potable water is treated with NaHCO3 NaClO and CaCl2 for the purpose of alkalinity control bacteria removal and remineralization. Overdosing of the chemicals may be the cause of severe corrosion of magnesium anode but studies on the effects of chemical injection rate on the corrosion properties of magnesium have rarely been carried out.In the present study we investigated the influences of NaHCO3 NaClO and CaCl2 concentration on the corrosion behavior especially active dissolution behavior of magnesium anode using various electrochemical techniques in conjunction with microstructure examination.
Magnesium is widely used as anode material for PWTs (Potable Water Tanks) in the offshore structures because it has excellent corrosion protection performance and is harmless to human body. However magnesium anodes installed in the PWT sometimes corrode with an abnormally high corrosion rate leading to pH increase (>pH10) andhydrogen accumulation in the tanks which decrease the water quality and lifetime of anodes.Potable water is treated with NaHCO3 NaClO and CaCl2 for the purpose of alkalinity control bacteria removal and remineralization. Overdosing of the chemicals may be the cause of severe corrosion of magnesium anode but studies on the effects of chemical injection rate on the corrosion properties of magnesium have rarely been carried out.In the present study we investigated the influences of NaHCO3 NaClO and CaCl2 concentration on the corrosion behavior especially active dissolution behavior of magnesium anode using various electrochemical techniques in conjunction with microstructure examination.
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Magnesium anodes are provided to the corrosion control industry by a number of domestic and international manufacturers and distributors.  Anode composition is commonly the only criterion used for quality control by the end users. Many of the anodes, however, have been shown to meet the compositional and potential specifications, and yet have had measured efficiencies as low as 7%.
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