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Crevice Corrosion (Control Methods (Use welded butt joint., Avoid using…

- - - - Excess positive charge produced inside the crevice due to dissolution of metal inside the crevice.
        
        This causes negative electrolyte charges to migrate into the crevice to balance the charge and form metal salt.
        
        Hydrolysis of metallic ions take place and form rust.
        
        Hydrogen ions and negative ions from the electrolyte promotes the dissolution rate and accelerates the corrosion process of the metal inside the crevice.
        
        Corrosion within the crevice increases, causes oxygen outside to deplete, avoid corrosion at external surface, form localized corrosion wiithin shielded area.