Step loading corrosion fatigue testing of 7075-T6 WC/C coated specimens in air and methanol. (September 2016)

• Record Type: Journal Article
• Authors: Baragetti, Sergio; Gerosa, Riccardo; Villa, Francesco
• Is Part Of: Engineering fracture mechanics. Volume 164(2016)
• Page Start: 106
• Page End: 116
• Publication Date: 2016-09
• Subjects: 7075-T6 -- Corrosion fatigue -- Methanol -- Thin films -- WC/C; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2016.02.027
• Languages: English
• ISSNs: 0013-7944

Abstract

Graphical abstract: Highlights: Mechanical, thermal and anti-corrosion effects of PVD on light alloys are analyzed. Presents new corrosion fatigue data for low T WC/C PVD coating on 7075-T6, N = 2e5. Methanol corrosion fatigue effects are presented on 7075-T6 substrate. SEM images of fractured samples show corrosion effects and coating protection. Abstract: The 7075-T6 aluminum alloy, despite its outstanding mechanical qualities, has shown critical issues due to its sensitivity to corrosion. In the present work, a Tungsten Carbide/Carbon (WC/C) thin hard coating has been evaluated for its effects on corrosion fatigue behavior on a 7075-T6 substrate, by means of rotating bending ( R = −1) step-loading tests at 2 ⋅ 10 5 cycles, in laboratory air and methanol, with different surface finishing. A corrosion fatigue protection effect was found for the smoothest coated specimens, along with detrimental fatigue effects caused by the high applied stresses and the coating process thermal effects. SEM analysis has been performed to characterize the fracture surfaces.