Electrochemically-induced TiO2 incorporation for enhancing corrosion and tribocorrosion resistance of PEO coating on 7075 Al alloy

Francesco Di Franco, Monica Santamaria, Amin Hakimizad, Ehsan Akbari, Keyvan Raeissi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

7075 Al alloy was PEO-treated in a silicate based electrolyte containing 3 g l-1 potassium titanyl oxalate using unipolar and bipolar pulsed current waveforms. The coating formed by the bipolar waveform with the wider cathodic pulses showed volcano-like surface morphology with no evidence of large pores at the metal/coating interface. It revealed the highest corrosion performance due to the synergistic effect of TiO2 incorporation and structural/morphological features along with a better passivation behavior indicating no pitting susceptibility. For this coating, the tribocorrosion tests showed no potential drop during sliding under 1 N with the lowest volume loss of 0.022 mm3.
Original languageEnglish
Pages (from-to)314-328
Number of pages15
JournalCorrosion Science
Volume143
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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