Abstract
The environment of the tidal zone is very complex.And the dry-wet alternation and interaction of sea erosion leads to serious corrosion of metal materials,making it difficult to adopt protective measures.Therefore,it is of great significance to study the corrosion and protection of metal materials in the tidal zone.Corrosion weight loss results showed that the corrosion behaviors of metal in different regions of tidal zone were altered,but the corrosion mechanism of metal materials in the tidal zone is not obvious.In order to study the corrosion mechanism of tidal corrosion,without considering the seawater splashing effect,a corrosion experimental trough was designed to simulation the tidal zone and immersion zone,and the corrosion behaviors of Q235B mild steel(designated) in it were monitored in situ by the potentiostat and electrochemical workstation.The results showed that the corrosion behaviors of Q235B steel at diverse positions are not the same.The corrosion rate of Q235B steel in the mid tide zone and low tide zone is higher than the highest tide zone and immersion zone.In a tidal range fluctuation cycle,the open-circuit potential variation law of the Q235B steel is related with the dry/wet state of the metal surface and the cathode/anode reactions.In the long term tidal corrosion process,the open-circuit potential variation of Q235B steel is related with the thickness of the rust layer.
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