The positive impact of the reactive sputtered nanostructured Nb₂O₅ coatings to reduce the FCG rates of the 2524-T3 alloy in an aggressive medium

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发表日期：

2024年5月22日

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M. O. A. Ferreira,
K. R. dos Santos,
D. G. Bon,
R. V. Gelamo,
R. Galo,
N. B. Leite,
C. A. R. P. Baptista,
H. C. Pinto,
J. A. Moreto

摘要

This work investigates the fatigue crack growth (FCG) behaviour of the 2524-T3 aluminium alloy uncoated and coated with reactive sputtered nanostructured Nb₂O₅ thin films. Fatigue and Fatigue-corrosion tests were carried out in air and an aggressive medium at a stress ratio R = (K_min/K_max) of 0.1, employing frequencies of 10 Hz (air) and 0.1 Hz (0.6 mol L^-1 NaCl solution), using a sinusoidal waveform. The Nb₂O₅ coatings were found to positively modify the FCG resistance of the 2524-T3 alloy for the same value of stress intensity factor (ΔK), acting as a protective barrier against localised corrosion process, and reducing FCG rates in aggressive environment.

Graphical Abstract

The positive impact of the reactive sputtered nanostructured Nb2O5 coatings to reduce the FCG rates of the 2524-T3 alloy in an aggressive medium

摘要

The positive impact of the reactive sputtered nanostructured Nb₂O₅ coatings to reduce the FCG rates of the 2524-T3 alloy in an aggressive medium