4.2 Article

A PROPOSAL FOR MODIFIED GALVANIC CORROSION MODEL: INVESTIGATING EFFECTS OF MICRO-ARC OXIDATION ON Al ALLOY

Journal

SURFACE REVIEW AND LETTERS
Volume 26, Issue 2, Pages -

Publisher

WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218625X18501470

Keywords

Galvanic corrosion; Al alloy; micro-arc oxidation; drill pipe joint; corrosion model

Funding

  1. China Scholarship Council [201708110028]
  2. National Nature Science Foundation of China [41772390]
  3. Graduate Innovation Project of Beijing Institute of Petrochemical Technology [16033981001/093]

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Corrosion is generally an undesirable phenomenon in most engineering applications. The effects of micro-arc oxidation (MAO) coating on Al alloy on the galvanic corrosion performance have been studied. The surface micro-structures were characterized using scanning electron microscope (SEM) and metallographic microscope before and after corrosion. Electrochemical studies on the corrosion behaviors have been reported by using open circuit potential (OCP) and potentiodynamic polarization (PDP) measurements in a slurry solution. All measurements were consistent with each other and showed that the MAO coating can significantly reduce the corrosion rate of Al alloy. A model for elucidating corrosion mechanism and corrosion process of the MAO coating on Al alloy is proposed.

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