Overview
EN ISO 17092:2023 (identical to ISO 17092:2005) specifies a standardized test method for determining the corrosion resistance of monolithic fine ceramics (advanced/technical ceramics) in acid and alkaline solutions. The method evaluates mass change, dimensional change and potential effects on subsequent flexural strength after exposure to corrosive liquids (examples: sulfuric acid, sodium hydroxide). The standard is intended for material development, quality control, characterization and generation of design data.
Key Topics and Requirements
- Scope: Corrosion testing of monolithic fine ceramics in acid and alkaline media to assess degradation and strength effects.
- Test solutions: Typical reagents include sulfuric acid (3 mol/L {6 N}) and sodium hydroxide (6 mol/L {6 N}); other solutions may be prepared at 3 mol/L. Use distilled or demineralized water and guaranteed-grade reagents.
- Apparatus: Glass or PTFE test container with vertical condenser to maintain a quiet boiling state, thermometer, and optional PTFE-lined sealed digestion vessels (if reported). Drying oven (105–120 °C), balance (0.1 mg sensitivity), micrometer (resolution 0.002 mm), vernier calipers (0.05 mm), and flexural test machine per ISO 7500-1.
- Specimen geometry and surface finish: Standard bar specimens typically 3.00 ± 0.20 mm thickness × 4.00 ± 0.20 mm width, with lengths >35 mm or >45 mm depending on fixture. Surface roughness ≤0.2 µm Ra; edges rounded/chamfered. Minimum of 10 specimens per corrosion condition, plus at least 10 for pre-test flexural strength.
- Procedure: Measure dimensions and dry to constant mass; immerse specimens in boiling test solution for 24 hours in a quiet boiling state; re-dry, re-measure mass and dimensions, and perform strength testing if required.
- Measurements & accuracy: Specifies instrument resolutions and testing-machine accuracy; records mass change, dimensional change and flexural strength changes to assess significance.
- Safety & reporting: Emphasizes appropriate safety when handling strong acids/alkalis. Test report should document materials, preparation, apparatus, solutions, timings and results. Note that elements may be subject to patent rights.
Applications - Who should use this standard
- Materials scientists and R&D teams developing advanced ceramics
- Quality control and inspection laboratories validating corrosion resistance
- Product designers and engineers needing design data for chemical environments
- Manufacturers and suppliers specifying acceptance criteria in contracts
- Certification bodies and test houses performing standardized evaluations
Related Standards
EN ISO 17092:2023 provides a repeatable, internationally recognized procedure to quantify chemical attack on fine ceramics - critical for selecting materials and assuring long-term performance in acidic or alkaline environments.
