BS EN 12923-1:2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Significance and use
5 Assessment of corrosive attack
   5.1 Introduction
   5.2 Method A: Depth of penetration
   5.3 Method B: Mass change
   5.4 Method C: Change of test piece size
   5.5 Method D: Strength change
   5.6 Method E: Change in surface roughness
   5.7 Method F: Change in hardness
6 Apparatus for laboratory corrosion testing
   6.1 Container for corroding medium
   6.2 Heating device
   6.3 Thermocouple
   6.4 Chemical balance
   6.5 Oven
   6.6 Dye penetrant equipment
   6.7 Travelling microscope or optical microscope
   6.8 Micrometer
   6.9 Vernier callipers
   6.10 Surface roughness measuring equipment
   6.11 Flexural strength test facility
   6.12 Hardness measurement equipment
7 Test pieces
   7.1 General requirements
   7.2 Specific requirements
   7.3 Number of test pieces
8 Test procedure
   8.1 Safety considerations
   8.2 Corrosion test
   8.3 Procedure
9 Expression of results
   9.1 Calculation of mass change (Method B)
   9.2 Change of component or test piece size (Method C)
   9.3 Calculation of flexural strength (Method D)
10 Test report
Annex A (informative) Appropriate container and specimen holder
                      materials for corrosion testing
   A.1 Mineral acids, excluding hydrofluoric acid
   A.2 Hydrofluoric acid (HF)
   A.3 Aqueous-based alkaline solutions
   A.4 Molten metal alloys
   A.5 Molten slags
   A.6 Corrosive gases
Bibliography

Defines guidelines to be employed when undertaking corrosion tests on advanced technical ceramics.

This part of EN 12923 specifies guidelines to be employed when undertaking corrosion tests on advanced technical ceramics. The mechanisms of chemical attack on advanced ceramics are widely varied and depend on the chemical and phase composition and the phase morphology of the material, as well as the corrosive conditions imposed. For any particular engineering application it is usually necessary to model expected conditions of use in order to obtain quantitative data on the ability to withstand the proposed end-use conditions. This European Standard is not restricted to specific material types, nor does it prescribe particular test conditions or a test duration. The actual testing requirements might be very specific, for example, in order to investigate the suitability of a range of materials for a given application in which certain specified conditions occur. This European Standard provides recommended methods for undertaking the assessment of the effect of corrosion and provides guidance on practical issues related to undertaking the tests.