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Drag reduction by corrosion inhibitors – A neglected option for mitigation of flow induced localized corrosion
Author(s) -
Schmitt G.
Publication year - 2001
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200105)52:5<329::aid-maco329>3.0.co;2-g
Subject(s) - drag , corrosion , chemistry , turbulence , materials science , polymer chemistry , thermodynamics , organic chemistry , physics
Drag reduction, i.e. the influence of additives in the ppm‐range on the reduction of skin friction caused by turbulent flowing liquids, results from interaction of macromolecules and higher molecular micellar aggregates of amphipathic molecules with near‐wall turbulence elements. Drag reducing properties exhibited by corrosion inhibitors above critical concentrations decide on the level of critical wall shear stresses for initiation of flow induced localized corrosion (FILC). The relevance of drag reduction on FILC inhibition is explained with the newly developed probabilistic model of FILC initiation. The impinging jet method is recommended to quantify the effect of inhibitors on critical wall shear stresses by corrosion experiments and on drag reduction by electrochemically controlled mass transport measurements. Experimental evidence is given for FILC inhibition in CO 2 and H 2 S corrosion systems. Drag reduction by corrosion inhibitors includes the interaction of shear‐induced molecular aggregate structures in near‐wall turbulences with adsorbates on the solid surface.