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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media
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Pretreatment with a β-Cyclodextrin-Corrosion Inhibitor Complex Stops an Initiated Corrosion Process on Zinc.

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Corrosion inhibitor complexes with β-cyclodextrin (β-CD) and 2-mercaptobenzothiazole (MBT) enhance metal pretreatment. These complexes effectively slow down coating delamination and promote repassivation on zinc surfaces.

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Electrochemistry

Background:

  • Metal pretreatment is crucial for effective corrosion protection systems.
  • Cyclic oligosaccharides like β-cyclodextrin (β-CD) can complex with organic corrosion inhibitors.
  • 2-mercaptobenzothiazole (MBT) is a molecular organic corrosion inhibitor.

Purpose of the Study:

  • To explore the incorporation of β-CD/MBT complexes into oxide-based pretreatment layers on metallic zinc.
  • To investigate the corrosion protection performance of these modified pretreatment layers.
  • To understand the mechanism of inhibitor release and repassivation.

Main Methods:

  • Formation of oxide-based pretreatment layers on zinc in the presence of β-CD.
  • Characterization of film morphology and chemical composition using X-ray photoelectron spectroscopy (XPS).
  • Monitoring of polymer coating delamination using scanning Kelvin probe (SKP).

Main Results:

  • Pretreatment layers exhibited a morphology dominated by spherical particles.
  • XPS confirmed the presence of intact and partially oxidized sulfur atoms from MBT.
  • SKP analysis revealed a significant slowdown in coating delamination and defect repassivation after approximately 10 hours.

Conclusions:

  • Complexes of β-CD and MBT can be successfully incorporated into inorganic pretreatments.
  • The incorporated MBT is released upon initiation of the corrosion process, facilitating repassivation.
  • This approach offers a promising strategy for enhanced corrosion protection of metallic materials.