Composite deposition mechanism of 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one in zinc films for enhanced corrosion resistant properties

• DCOIT participated in the electrodeposition process by chelating Zn2+.
• DCOIT chelated Zn2+ by means of its carbonyl group and carbon-chloride bond.
• The DCOIT mass faction of the DCOIT-zinc composite film was 5%.
• The DCOIT-zinc composite film exhibited uniform corrosion in natural seawater.

The present research seeks to address biologically influenced corrosion by electrodepositing a novel 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one(DCOIT)-zinc composite films for enhanced corrosion resistant properties. Investigated by electrochemical methods, energy dispersive spectroscopy distribution mapping, and infrared absorption spectroscopy, a deposition mechanism was proposed wherein the DCOIT molecule chelated the zinc ion to participate in electrodeposition. The DCOIT-zinc chelate produced obvious alterations in the surface morphology and crystal orientations. Thermogravimetric analysis determined the DCOIT mass fraction in the composite film was 5%. The DCOIT-zinc composite film demonstrated uniform corrosion in natural seawater and the enhanced anticorrosion property was achieved by successfully embedding DCOIT.

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