Influence of Ru on structure and corrosion behavior of passive film on Ti-6Al-4V alloy in oil and gas exploration conditions

Abstract

In order to investigate the influence of minor Ru on the electrochemical behaviour and structural characteristics of passive films on the surface of Ti-6Al-4V alloys under various oil and gas exploration conditions, electrochemical techniques, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and corrosion simulation tests were carried out. The results revealed that the oil and gas exploration conditions had a serious impact on the electrochemical behaviour and corrosion resistance of the tested alloys. The passivation film resistance and corrosion potential of the tested titanium alloys were significantly reduced with increasing acidity and temperature. With the addition of minor ruthenium, the potential of the passive film on the Ti-6Al-4V-0.11Ru alloy surface increased because of the high surface potential of the ruthenium element. The contents of metallic ruthenium and tetravalent titanium oxide TiO2 in the surface film of the Ti-6Al-4V-0.11Ru alloy both increased with increasing temperature, which led to increase the thickness, stability, corrosion resistance and repairability of the passive film on the surface of the Ti-6Al-4V-0.11Ru alloy being better than those qualities of Ti-6Al-4V. These results were also confirmed by corrosion simulation tests.

The use of POPE Phospholipid as a First-layer Coating of the Ti-6Al-4V Alloy: Preliminary Studies

“…Considering the base alloy, the potential values determined on the OCP measurements are in line with those displayed in the literature [10]. Furthermore, as mentioned in the literature [11,12], different values of this parameter are expected, since it is dependent on the chemical composition of the solution, pH as well as the temperature of the studied system. Figure 2 displays the Nyquist diagrams for the Ti-6Al-4V and Ti-6Al-4V/POPE samples.…”

Interaction Mechanism and Electronic Dynamics between Defects and Hydrogen Atoms in TiO2 Thin Films

“…3,4 Consequently, it is crucial to study the hydrogen barrier mechanisms under defective structures, aiming to alleviate potential hazards stemming from hydrogen ingress and guarantee the safe and dependable operation of hydrogenrelated systems. 5 Limited comprehension of hydrogen barrier failure mechanisms associated with oxide film defects restricts the broad application of TiO 2 film repair technologies in engineering, specifically for hydrogen resistance and corrosion protection. 6 Hence, unraveling these mechanisms could lead to innovative technologies mitigating hydrogen ingress and enhancing material durability in hydrogen-rich environments.…”

“…Currently, oxide films’ hydrogen barrier capabilities are significantly impacted by inevitable microstructural defects common in industrial environments. Defects enable hydrogen atoms to infiltrate materials, posing significant threats to the sustained operation of hydrogen-exposed equipment. , Consequently, it is crucial to study the hydrogen barrier mechanisms under defective structures, aiming to alleviate potential hazards stemming from hydrogen ingress and guarantee the safe and dependable operation of hydrogen-related systems . Limited comprehension of hydrogen barrier failure mechanisms associated with oxide film defects restricts the broad application of TiO 2 film repair technologies in engineering, specifically for hydrogen resistance and corrosion protection .…”