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Corrosion of stainless steel components in seawater reverse osmosis desalination plants—investigations on adapted internal cathodic protection
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
Veolia Eau, France.
Ifremer, France.
KSB SAS, France.
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2015 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 55, no 9, p. 2478-2490Article in journal (Refereed) Published
Abstract [en]

Abstract: Stainless steel is widely used in seawater reverse osmosis units (SWRO) for both good mechanical and corrosion resistance properties. However, many corrosion failures of stainless steel in SWRO desalination units have been reported. These failures may often be attributed to un-adapted stainless steel grade selection and/or to the particular aggressive seawater conditions in “warm” regions (high ambient temperature, severe biofouling, etc.). Cathodic protection (CP) is a well-known efficient system to prevent corrosion of metallic materials in seawater. It is successfully used in the oil and gas industry to protect carbon steel structures exposed in open-sea. However, the specific service conditions of SWRO units may seriously affect the efficiency of such anti-corrosion system (high flow rates, large stainless steel surfaces affected by biofouling, confinement limiting protective cathodic current flow, etc.). Hence, CP in SWRO units should be considered with special care and modeling appears as useful tool to assess an appropriate CP design. However, there is a clear lack of CP data that could be transposed to SWRO service conditions (i.e. stainless steel, effect of biofouling, high flow rate, etc.). From this background a Join Industry Program was initiated including laboratory exposures, field measurements in a full scale SWRO desalination plant, and modeling work using PROCOR software. The present paper reviews the main parameters affecting corrosion of stainless steel alloys in seawater reverse osmosis units. CP on specific stainless steel devices was investigated in order to assess its actual efficiency for SWRO units. Severe environmental conditions were intentionally used to promote corrosion on the tested stainless steel products in order to evaluate the efficiency of CP. The study includes a modeling work aiming at predicting and designing adapted CP protection to modeled stainless steel units. An excellent correlation between modeling work and field measurements was found.

Place, publisher, year, edition, pages
Taylor and Francis Inc. , 2015. Vol. 55, no 9, p. 2478-2490
Keywords [en]
Cathodic protection, Corrosion, Seawater reverse osmosis, Stainless steels, desalination, environmental conditions, modeling, osmosis, seawater, steel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40036DOI: 10.1080/19443994.2014.939499Scopus ID: 2-s2.0-84939651950OAI: oai:DiVA.org:ri-40036DiVA, id: diva2:1357025
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-16Bibliographically approved

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Desalination and Water Treatment
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