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thӫy triӅu biӇn TiӃng Anh: Design and numerical simulation of constructional steel corrosion

in tidal marine environment

II NHIӊM VӨ 9¬1ӜI DUNG

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ABSTRACT

This study has investigated the roles of differential aeration on corrosion EHKDYLRUV RI FRQVWUXFWLRQ VWHHO SLSH SLOH LQ 9LHWQDP¶V VHDZDWHU HQYLURQPHQW 7KHcauses of differential aeration were considered to be the tidal, the seawater flow and the cover of corrosion product layer The well aeration led to anode-FDWKRGHFRXSOHV¶formation and differed the corrosion rate between places The horizontal differential aeration was attributed to seawater flow and fairly resulted in uniform corrosion except

in the wake region where steel is less corroded Therefore, the severe corrosion of steel

in the tidal zone was attributed to the vertical differential aeration In which, the corrosion product layer prevented the corrosion by reducing or constraining the oxygen diffusion process The flooding tidal enhanced the corrosion near the water surface due to fast transport of a large amount of oxygen Besides, the ebbing tidal could also forms a thin electrolyte layer on the steel surface which accelerated the corrosion This study also proposed a convenient way to modelling the instant appearance/disappearance of the electrolyte at the steel surface under tidal flood/ebb phase on a 2D plane The model will be improved to handle the investigation of above IDFWRUV¶VLPXOWDneous impact and aim for a high reliability prediction of life span

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Abstract iv

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Mөc lөc vi

Danh mөFKuQK ҧnh xii

Danh mөc bҧng biӇu xvi

&+ѬѪ1**,ӞI THIӊU TӘNG QUAN 1

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