Corrosivity evaluation of SWRO membrane desalted permeate

Autor: Dal-Sik Woo, Byung-Gi Hwang
Rok vydání: 2013
Předmět:
Zdroj: KSCE Journal of Civil Engineering. 18:53-59
ISSN: 1976-3808
1226-7988
DOI: 10.1007/s12205-014-0161-7
Popis: To evaluate the corrosivity of seawater, the SWRO (Sea Water Reverse Osmosis) produced water, and the community tap water were used in this study. Weight loss method and potentiodynamic polarization test were applied to compare the corrosivity between them. Coupons and pipes for the experiments were prepared with the same materials such as carbon steel, zinc, copper, and STS304 achieved in equivalent condition. As a result of experiments, seawater showed constituent ions such as Cl−, SO42−, Mg2+, and Ca2+ (in order of abundance), while the SWRO produced water showed lower pH, calcium hardness and alkalinity than the tap water. Since chloride ion, as an acceleration factor of corrosion, was highly detected, the test results of weight loss method and potentiodynamic polarization indicated that release of metal ions and weigh loss were more abundant in the SWRO membrane desalted permeate than in the tap water. Besides, corrosion potential was also lower in SWRO membrane desalted permeate. It represents that the surface of metal could be exposed easily to oxidize in SWRO condition due to low dissolved alkali metal ion of water.
Databáze: OpenAIRE
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