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.

Akbari, E., Di Franco, F., Ceraolo, P., Raeissi, K., Santamaria, M., Hakimizad, A. (2018). Electrochemically-induced TiO2 incorporation for enhancing corrosion and tribocorrosion resistance of PEO coating on 7075 Al alloy. CORROSION SCIENCE, 143, 314-328 [10.1016/j.corsci.2018.08.037].

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

Di Franco, Francesco;Santamaria, Monica
;
2018-01-01

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.
2018
Settore ING-IND/23 - Chimica Fisica Applicata
Akbari, E., Di Franco, F., Ceraolo, P., Raeissi, K., Santamaria, M., Hakimizad, A. (2018). Electrochemically-induced TiO2 incorporation for enhancing corrosion and tribocorrosion resistance of PEO coating on 7075 Al alloy. CORROSION SCIENCE, 143, 314-328 [10.1016/j.corsci.2018.08.037].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/339544
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