Effects of the components of a composite rust conversion solution on rust conversion behavior
[Introduction] The development of an environmentally friendly rust converter has significant importance for the corrosion protection and lifespan extension of rusted steel structures, which cannot undergo rust removal and repainting in workshop. [Method] The electrochemical behavior of rusted Q235 steel in different rust converters comprising 3％ (mass fraction) of single or mixed acids was studied by open circuit potential measurement, electrochemical impedance spectroscopy, and polarization curve measurement. The reaction status and composition of rust layers in different rust converters were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, and infrared spectroscopy. The wettability of organic resin solution on the surface of rust conversion film was analyzed by using a contact angle goniometer. [Result] In the mixture of 1％ phytic acid, 1％ tannic acid, and 1％ gallic acid, the rust layer could be dissolved rapidly by phytic acid with strong acidity, and the large amount of iron ions generated was then chelated by phytic acid, tannic acid, and gallic acid, forming a compact rust conversion film. [Conclusion] The mixed acid can be used as a rust converter to form a conversion film with better performance than a single acid, and the conversion film is compatible with organic resins.
carbon structural steelrepaintingrust conversionphytic acidtannic acidgallic acidelectrochemistrycompatibility to resin
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