ISO 17092:2005 pdf free
ISO 17092:2005 pdf free.Fine ceramics [advanced ceramics, advanced technical ceramics]一Determination of corrosion resistance of
monolithic ceramics in acid and alkaline solutions
Corrosion testing apparatus, for example, any suitable apparatus capable of maintaining the test solution in a quiet boiling state and also maintaining the test solution at a constant concentration The test container shall be made of glass or polytetrafluoroethylene, and shall have a capacity of about 1 litre.The test container should be connected to a glass vertical-type condenser, having a sufficient cooling area, by a tapered ground joint. The test apparatus shall be equipped with a thermometer for monitoring the solution temperature. Since the severe boiling state may cause mechanical damage to test specimens, the “quiet boiling state” is preferable.
NOTE 1 A device, such as a basket or a system of suspension wires resistant to the corrosive medium, may be used to prevent contact between test specimens, and to raise them off the bottom of the vessel.
Alternatively, the test specimens may be placed in a PTFE-lined chemical digestion vessel with the reagent, sealed and heated to the required test temperature. If this approach is employed, it shall be recorded in the test report.
NOTE 2″Quiet boiling” refers to the level of bubble (vapour) formation in the liquid at a low enough level and frequency to eliminate movement of the test specimen.
Measure the width (b) and thickness (h) of each test specimen at several places using the micrometer (4.5) with a resolution of 0,002 mm. Measure the overall length (LT) with the vernier callipers (4.6) with a resolution of 0,05 mm. For other shapes of test specimen, measure relevant dimensions at several different places (e.g.diameter and thickness of a disc). Wash and degrease the test specimens. Place in the oven (4.2) and heat to a temperature of 105 °C to 120 °C until their mass is constant. Remove and store in a desiccator. When cooled to room temperature, weigh each to the nearest 0,1 mg using the balance (4.7). Store in the desiccator until tested.
NOTE For the majority of fine ceramics (advanced ceramics, advanced technical ceramics), the washing and degreasing conditions have lttle effect on the subsequent corrosion properties, and water and solvents are removed by the subsequent oven treatment. However, some materials, e.g. boron nitride or beta-alumina, may be influenced by any washing process. Care should be taken to ensure that any cleaning process used does not affect the results of the corrosion test.ISO 17092 pdf free download.
