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ĈӅ WjLÿmNKҧRViWÿѭӧc sӵ ҧQKKѭӣng cӫa yӃu tӕ WK{QJNKtNKiFELӋWÿӃQKjQKYLăQPzQFӫa cӑc ӕQJWKpS [k\Gӵng WURQJP{LWUѭӡng biӇn ViӋW1DP%DWiFQKkQJk\ra sӵ WK{QJNKtNKiFELӋWÿѭӧc tұp trung khҧRViWOjFKXNǤ thӫy triӅXGzQJFKҧ\Qѭӟc biӇQ Yj Vӵ che phӫ cӫa lӟp sҧn phҭP ăQ PzQ Sӵ WK{QJ NKt NKiF ELӋt sӁ KuQK WKjQKJKpS Fһp anode ± cathode cөc bӝ WUrQ EӅ mһWWKpSWҥo ra sӵ NKiF ELӋt vӅ tӕF ÿӝ ăQPzQ6ӵ WK{QJNKtNKiFELӋWWKHRSKѭѫQJQJDQJJk\UDEӣLGzQJFKҧ\Qѭӟc biӇQFy[XKѭӟng tҥRUDăQPzQÿӅu quanh bӅ mһt cӑFYjYӏ WUtNKXҩWGzQJFKҧ\WKѭӡQJăQPzQtWKѫQ'RÿyVӵ ăQPzQPmQKOLӋt cӫDWKpSWURQJYQJWKӫy triӅXOjGRVӵ NKiFELӋWWUrQ SKѭѫQJ GӑF 7URQJ ÿy Oӟp sҧn phҭP ăQ PzQ Fy YDL WUz NuP KmP TXi WUuQK FDWKRGHWK{QJ TXD Fҧn trӣ TXi WUuQK NKXӃFK WiQ FӫD R[\ FzQ WKӫy triӅu GkQJ OrQ PDQJ Pӝt Oѭӧng lӟQR[\KzDWDQÿӃn bӅ mһWÿLӋn cӵFYjWăQJFѭӡQJăQPzQ1JRjLUDWKӫy triӅu hҥ xuӕQJ FzQ Fy WKӇ ÿӇ lҥi mӝt lӟS PjQJ ÿLӋn ly mӓng nhұQ Oѭӧng lӟn oxy trong NK{QJNKtYjJLDWӕFăQPzQErQWUrQPһWQѭӟFĈӅ WjLQj\FzQÿӅ xuҩWSKѭѫQJiQP{phӓng hiӋQWѭӧQJKuQKWKjQKELӃn mҩWP{LWUѭӡQJÿLӋn ly tӭFWKuWUrQEӅ mһWÿLӋn cӵc WURQJTXiWUuQKWKӫy triӅXWUrQPһt phҷng dӑc hai chiӅX0{KuQKVӁ tiӃp tөFÿѭӧFKRjQthiӋQ ÿӇ khҧR ViW KjQK YL ăQ PzQ FӫD WKpS [k\ GӵQJ WURQJ P{L WUѭӡng biӇQ GѭӟL WiFÿӝQJÿӗng thӡi nhӳQJWiFQKkQNӇ WUrQYjKѭӟQJÿӃn ӭng dөng dӵ ÿRiQWXәi thӑ vӟLÿӝ tin cұy cao
Trang 6ABSTRACT
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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