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Underdeposit test method for assessing performance of corrosion inhibitors.

Hinds, G; Cooling, P; Zhou, S; Turnbull, A (2008) Underdeposit test method for assessing performance of corrosion inhibitors. In: Eurocorr 2008, 2008.

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A laboratory test method has been developed at NPL to assess the performance of corrosion inhibitors under sand deposits. A multi-electrode array consisting of 24 carbon steel electrodes encased in epoxy is used to allow simultaneous testing of a range of surface conditions. Individual electrodes can be pre-corroded to different depths to simulate varying degrees of damage in service. During the test, the electrodes are coupled to an external carbon steel cathode and the galvanic corrosion current at each electrode is monitored. The effectiveness of the inhibitor as a function of surface damage can thus be readily evaluated. The test method was demonstrated on two different inhibitors under sweet conditions. It was noted that replenishment of inhibitor concentration at regular intervals to reflect conditions in service may provide a more severe test of inhibitor performance. Measurements of individual galvanic corrosion currents in the multi-electrode array highlight the importance of statistical variations in determining the worst-case corrosion rate.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: carbon steel, inhibitor, testing, underfilm corrosion
Subjects: Advanced Materials
Advanced Materials > Corrosion
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4190

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