The Effect of Gradient Bias Design on Electrochemistry and Tribology Behaviors of PVD CrN Film in a Simulative Marine Environment

Abstract

CrN films with various bias voltage designs (−20, −50, −80, −20~−80 V gradient change) were prepared via arc ion plating. Scanning electron microscope (SEM), X-ray diffraction (XRD), nanoIndentor, electrochemistry workstation and tribo-meter were selected to evaluate the microstructure, mechanics, electrochemistry and tribology behaviors of as-prepared specimens in a simulative marine environment. By comparison, the adhesion force and anti-corrosion ability of CrN film with a gradient bias design were greatly enhanced compared with other films. The tribology behaviors of as-prepared specimens under various normal loads and sliding frequencies were deeply discussed. The result showed that the bias design played a critical role to impact the friction and wear behavior of film. Meanwhile, the CrN film with gradient bias design could bear a load of 25 N while other single CrN films failed, implying the strongest load-bearing capacity. Furthermore, at the same test condition, the lowest friction coefficient (COF) and wear loss were observed for CrN film with a gradient bias design, implying outstanding anti-friction and anti-wear abilities.

Solution Processable CrN Thin Films: Thickness-Dependent Electrical Transport Properties

“…All the films are single-phase and have no detectable impurities. The X-ray diffraction patterns can be indexed by the space group of Fm-3m (PDF card number 03-065-9001) with a rock-soft structure, as shown in the left inset of Figure 2, which is consistent with the previous results [22,23]. The derived thin films were randomly oriented and had a polycrystalline structure.…”

“…The diffraction rings from center to edge are indexed as (111), (200), (220) and (311) respectively, indicating the polycrystalline characteristics. The crystal structure of the derived CrN thin film can be indexed as a rock-soft cubic structure with the space group of Fm-3m (PDF card number 03-065-9001), which is the same as in previous reports [22,23].…”

Enhancing electrocatalytic activity in metallic thin films through surface segregation of carbon

“…38,39 Formation of CrN is also taking place on the annealed Cr layer as apparent from the XRD spectra. 40 The small peaks at around 50-551 are due to reflections of 311 planes of the Si(100) substrate. In the case of HCP-Ti, metallic Ti could be changing into Ti oxides and suboxides on annealing.…”

Effect of Deep Cryogenic Treatment on Microstructure and Wear Resistance of LC3530 Fe-Based Laser Cladding Coating

“…It was distinct that the 0 HCT sample had a severe wear profile, which showed obvious internal deformation and large areas of collapse on both sides of the wear scar. This was because the 0 HCT sample had a low microhardness, so the asperity had severe deformation under the action of an external load and the surface was subjected to devastation [27,28]. However, the wear peak ridges of cladding coating with DCT only can be seen on both sides of the wear scar, and the ploughing phenomena of the internal wear scar were obvious (Figure 7b–f).…”