Metals· 2026Q2
Corrosion Response of Co-6Ti-11V-9Cr Alloy in Acidic Chloride Solutions
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- Q2SCImago
- 2026year
Short summary
Increasing NaCl concentration in acidic solutions significantly degrades the passive film on Co-6Ti-11V-9Cr superalloys, shifting corrosion potential negatively and increasing passive current density.
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Key points
- Increasing NaCl concentration shifts open-circuit and corrosion potentials negatively.
- Barrier layer resistance decreased from 4.61 × 10^4 to 0.39 × 10^4 Ω cm^2 with increasing NaCl.
- Passive current density increased from 4.58 × 10^-6 to 1.78 × 10^-5 A cm^-2.
- Chloride enrichment promotes localized passive-film breakdown and pitting.
AI-generated from the title and abstract; the full text is not read.
Abstract
The corrosion response of a Co-6Ti-11V-9Cr superalloy was investigated in 0.05 mol/L H2SO4 containing 0, 0.01, 0.1 or 0.5 mol/L NaCl. Open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation, scanning electron microscopy (SEM) and electrochemical noise (EN) analysis were combined to determine how chloride concentration affects passive-film stability and localised corrosion. Increasing the NaCl concentration shifted both the OCP and corrosion potential in the negative direction. The fitted resistance of the barrier layer decreased from 4.61 × 104 to 0.39 × 104 Ω cm2, whereas the passive current density increased from 4.58 × 10−6 to 1.78 × 10−5 A cm−2. SEM and EN analyses further showed that chloride enrichment promoted local passive-film breakdown, changing the surface response from relatively uniform corrosion to localised attack and pitting. These findings provide an experimental basis for assessing Co-Ti-V-based superalloys in acidic chloride-containing service environments.
The authors' abstract, as published at the source. Metals, 2026 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science