6533b7dafe1ef96bd126ec6e

RESEARCH PRODUCT

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

Francesco Di FrancoEhsan AkbariKeyvan RaeissiKeyvan RaeissiAmin HakimizadPaolo CeraoloMonica Santamaria

subject

Materials sciencePassivationGeneral Chemical EngineeringTribocorrosionAlloyB. polarization02 engineering and technologyElectrolyteB. EISengineering.material01 natural sciencesOxalateCorrosionCathodic protectionchemistry.chemical_compoundCoating0103 physical sciencesGeneral Materials ScienceChemical Engineering (all)A. aluminiumComposite materialB. SEM010302 applied physicsChemistry (all)General Chemistry021001 nanoscience & nanotechnologySettore ING-IND/23 - Chimica Fisica ApplicatachemistryengineeringC. oxide coatingC. anodic filmMaterials Science (all)0210 nano-technology

description

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.

yearjournalcountryeditionlanguage
2018-10-01
10.1016/j.corsci.2018.08.037http://hdl.handle.net/10447/339544