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51316-7058-Galvanic Series in Seawater as a Function of Temperature Oxygen Content and Chlorination

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In this work, the open circuit potential of different stainless steel grades as well as nickel based and copper based alloys has been systematically measured in seawater under different experimental conditions. In particular the effect of temperature, oxygen content and chlorination level have been studied.

Product Number: 51316-7058-SG
ISBN: 7058 2016 CP
Author: Dominique Thierry
Publication Date: 2016
Industries: Maritime , Materials Selection and Design
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 The open-circuit potential is one of the main driving force of galvanic corrosion when two dissimilar metals are in electrical continuity in an electrolyte. From the existing literature the galvanic series which provide averaged potential of metallic materials in seawater are generally restricted to ambient/standard conditions or to a limited number of alloys. However advanced materials have been developed in the last decade and the corrosion potential of any alloy immersed in seawater may be strongly affected by environmental factors. There is a lack of information on these purposes (e. g. effect of dissolved oxygen content, temperatures, chlorination at different levels, potential or recently developed alloys, etc.). In this work, the open circuit potential of different stainless steel grades as well as nickel based and copper based alloys has been systematically measured in seawater under different experimental conditions. In particular the effect of temperature (from 30 to 70°C), oxygen content (from 10 ppb to saturation) and chlorination level (from 0 to 0.5 ppm) have been studied. The work can also be used for material selection in terms of risk of bi-metallic corrosion when coupling two materials under these conditions. 

Key words: Marine corrosion, galvanic corrosion, stainless steel

 

 The open-circuit potential is one of the main driving force of galvanic corrosion when two dissimilar metals are in electrical continuity in an electrolyte. From the existing literature the galvanic series which provide averaged potential of metallic materials in seawater are generally restricted to ambient/standard conditions or to a limited number of alloys. However advanced materials have been developed in the last decade and the corrosion potential of any alloy immersed in seawater may be strongly affected by environmental factors. There is a lack of information on these purposes (e. g. effect of dissolved oxygen content, temperatures, chlorination at different levels, potential or recently developed alloys, etc.). In this work, the open circuit potential of different stainless steel grades as well as nickel based and copper based alloys has been systematically measured in seawater under different experimental conditions. In particular the effect of temperature (from 30 to 70°C), oxygen content (from 10 ppb to saturation) and chlorination level (from 0 to 0.5 ppm) have been studied. The work can also be used for material selection in terms of risk of bi-metallic corrosion when coupling two materials under these conditions. 

Key words: Marine corrosion, galvanic corrosion, stainless steel

 

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