Methodology
1. Sample Preparation
Material Selection: Titanium alloy Ti-3Al-2.5V.
Cutting and Shaping: Samples are cut to standardized dimensions.
Surface Preparation: Sequential polishing with silicon carbide papers, from 320 to
2000 grit.Final polishing to create a smooth, mirror-like surface.
2. Corrosion Exposure Testing
Objective:
To simulate different corrosive environments and study their effects on Ti-3Al-2.5V samples.
Testing Environments
1. Sulfuric Acid (H₂SO₄): Industrial acidic environment.
2. Sodium Hydroxide (NaOH): Alkaline condition.
3. 3.5% Sodium Chloride (NaCl): Marine/saltwater environment.
Procedure:
Samples are immersed in each solution for a set period, then inspected for corrosion
effects such as pitting and surface degradation.
3. Tensile Strength Testing of Corroded Samples
Objective: To evaluate tensile strength post-corrosion at different strain rates.
Testing Equipment: Universal Testing Machine (UTM).
Strain Rates: Measurements:
1. 10⁻¹ s⁻¹ (high strain rate) Record tensile strength, elongation,
2. 10⁻² s⁻¹ (medium strain rate) and fracture characteristics for
3. 10⁻³ s⁻¹ (low strain rate) corroded samples.
4. Fatigue Crack Growth Testing
Objective: To assess fatigue crack growth under various load ratios.
Testing Parameters:
Load Ratios (R-values):
1. R = 0.1 (low load ratio)
2. R = 0.5 (medium load ratio)
3. R = 0.8 (high load ratio)
Procedure:
Measure crack growth rate and fatigue life of samples under cyclic loading.
5. Microstructure Analysis
FESEM (Field Emission Scanning Electron Microscopy): Examine corroded samples at the
microscopic level to observe surface and crack morphology.
Optical Microscopy: Observe and capture microstructure details before and after
corrosion to assess any changes in grain boundaries or phase transformations due to
corrosion.
6. Results Comparison
Objective:
Compare tensile strength and fatigue crack growth between uncorroded (normal) and
corroded samples under each testing condition.
Data Analysis:
Compare tensile strength and elongation between normal and corroded samples at
different strain rates.
Examine fatigue crack growth differences under varying load ratios to understand the
effect of corrosion.
