ISO 17092:2005

Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of corrosion resistance of monolithic ceramics in acid and alkaline solutions

ISO 17092:2005 describes the test method for determining the corrosion resistance of fine ceramics in acid and alkaline solutions, such as sulfuric acid and sodium hydroxide. This International Standard is designed to provide an assessment of the mass changes and dimensional changes of test specimens following the corrosion test immersed in the corrosive liquids, and to assess whether corrosion has a significant effect on the subsequent strength. This test method may be used for development of materials, quality control, characterization, and design-data generation purposes.

Céramiques techniques — Détermination de la résistance à la corrosion des céramiques monolithiques dans des solutions acides et alcalines

General Information

• Status: Published
• Publication Date: 07-Nov-2005
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: ISO/TC 206 - Fine ceramics
• Drafting Committee: ISO/TC 206/WG 7 - Monolithic ceramics/Physical and thermal properties
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 20-Nov-2020

Relations

• Consolidated By: ISO 4210-9:2014 - Cycles — Safety requirements for bicycles — Part 9: Saddles and seat-post test methods
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 17092
First edition
2005-11-01
Fine ceramics [advanced ceramics,
advanced technical ceramics] —
Determination of corrosion resistance of
monolithic ceramics in acid and alkaline
solutions
Céramiques techniques — Détermination de la résistance à la corrosion
des céramiques monolithiques dans des solutions acides et alcalines
Reference number
ISO 17092:2005(E)
ISO 2005
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ISO 17092:2005(E)
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© ISO 2005

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ii © ISO 2005 – All rights reserved
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ISO 17092:2005(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope ..................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 1

4 Apparatus .............................................................................................................................................. 2

5 Test solutions........................................................................................................................................ 2

6 Test specimens ..................................................................................................................................... 3

7 Test procedure ...................................................................................................................................... 3

8 Calculations........................................................................................................................................... 4

9 Test report ............................................................................................................................................. 5

Annex A (informative) General information..................................................................................................... 6

Annex B (informative) Interlaboratory evaluation of the test method .......................................................... 7

Bibliography ....................................................................................................................................................... 9

© ISO 2005 – All rights reserved iii
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ISO 17092:2005(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 17092 was prepared by Technical Committee ISO/TC 206, Fine ceramics.
iv © ISO 2005 – All rights reserved
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INTERNATIONAL STANDARD ISO 17092:2005(E)
Fine ceramics [advanced ceramics, advanced technical
ceramics] — Determination of corrosion resistance of
monolithic ceramics in acid and alkaline solutions
1 Scope

This International Standard describes the test method for determining the corrosion resistance of fine

ceramics in acid and alkaline solutions, such as sulfuric acid and sodium hydroxide. This International

Standard is designed to provide an assessment of the mass changes and dimensional changes of test

specimens following the corrosion test immersed in the corrosive liquids, and to assess whether corrosion has

a significant effect on the subsequent strength. This test method may be used for development of materials,

quality control, characterization, and design-data generation purposes.

NOTE The units and numerical values given in { } in this standard are based on traditional units and are appended

for information.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 3611, Micrometer callipers for external measurement
ISO 3696, Water for analytical laboratory use — Specification and test methods

ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions

and surface texture parameters

ISO 6353-2, Reagents for chemical analysis — Part 2: Specifications — First series

ISO 6906, Vernier callipers reading to 0,02 mm

ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Verification and calibration of the force-measuring system

ISO 14704:2000, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for

flexural strength of monolithic ceramics at room temperature
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
corrosion resistance

resistance against corrosion of fine ceramic material due to reaction with corrosive species in the surrounding

environment, including chemical reactions at grain boundaries and secondary phases

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ISO 17092:2005(E)
3.2
flexural strength
maximum nominal stress at fracture of a specified elastic beam loaded in bending
4 Apparatus

4.1 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.

4.2 Drying device, for example an oven, capable of achieving constant mass of the test specimens by

maintaining a temperature of 105 °C to 120 °C.

4.3 Testing machine for flexural strength, capable of applying a uniform crosshead speed. The testing

machine shall be in accordance with ISO 7500-1, with an accuracy of 1 % of the indicated force at fracture.

4.4 Test fixture for flexural strength, of three- or four-point flexure configuration in accordance with 5.2 of

ISO 14704:2000.

NOTE The recommended fixture is fully articulated and of the four-point-1/4 point configuration with the two outer

bearings at a distance of 40 mm. The corresponding total length of the test specimen is 45 mm or more.

4.5 Micrometer, such as that shown in ISO 3611 but with a resolution of 0,002 mm for measuring the

specimen dimensions. The micrometer shall have flat anvil faces such as those shown in ISO 3611. The

micrometer shall not have a ball tip or sharp tip, since these might damage the specimen. Alternative

dimension-measuring instruments may be used, provided that they have a resolution of 0,002 mm or finer.

4.6 Vernier callipers, in accordance with ISO 6906, with a resolution of 0,05 mm or finer for measuring the

length of the test specimen. Alternative dimension-measuring instruments may be used, provided that they

have a resolution of 0,05 mm or finer.
4.7 Balance, with a sensitivity of at least 0,1 mg.
5 Test solutions

Sulfuric acid or sodium hydroxide solution is used for the test solution. For sulfuric acid solution, prepare the

solution of 3 mol/l {6 N} concentration with guaranteed reagent as specified in ISO 6353-2, and distilled water

or demineralized water as specified in ISO 3696. For sodium hydroxide solution, prepare the solution of

6 mol/l {6 N} concentration with guaranteed reagent as specified in ISO 6353-2 and distilled water or

demineralized water. For solutions other than sulfuric acid and sodium hydroxide, prepare the solution of

which the concentration becomes 3 mol/l. It is recommended to use the solution volume of 0,5 litre for each

corrosion test.
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ISO 17092:2005(E)

SAFETY PRECAUTIONS — Appropriate safety precautions must be employed when preparing and

handling these solutions.
6 Test specimens

The test specimen for the corrosion test shall be prepared in accordance with Clause 6 of ISO 14704:2000.

The standard test specimens shall have cross-sectional dimensions of 3,00 mm ± 0,20 mm thickness, and

4,00 mm ± 0,20 mm width. The length shall be more than 35 mm for 30 mm test fixtures or more than 45 mm

for 40 mm test fixtures. All the surfaces shall be machined, and the surface roughness shall be not more than

0,2 µmRa as defined in ISO 4287. Edges shall be rounded or chamfered. Any machining procedure and the

surface quality of the test specimens shall be reported. The minimum number of test specimens shall be 10

for each corrosion condition to be tested, and at least 10 test specimens shall be used for flexural strength

measurements before the corrosion test. Means shall be taken to identify individually similar test specimens,

but shall not be marked or scribed in a way that might affect the result of the test. If strength changes are not

to be determined, any test specimens in terms of size and shape may be used.

NOTE A graphite pencil mark may be a suitable means of marking test specimens of most types.

7 Test procedure
7.1 Measurements of dimensions and mass of specimens

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 (L ) 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 little 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.
7.2 Corrosion test

Heat the test container (4.1) filled with test solution to a quiet boiling state. Then place the test specimens

gently on the bottom of the container and maintain the boiling state continuously for 24 h. The test specimens

allowed in a single container are of the same material and the maximum number of test specimens is ten.

New test solution shall be used in every test. After conducting the corrosion test, take the test specimen out

from the test container, and wash sufficiently with distilled or demineralized water. Dry at 105 °C to 120 °C

until constant mass is achieved, and transfer to a desiccator quickly.

NOTE Appropriate care must be taken when opening the vessel and inserting the test specimens to avoid splashing.

7.3 Measurements of mass and dimensional changes

Weigh the test specimens individually to the nearest 0,1 mg. If appropriate, remeasure the external

dimensions of the test specimens for the determination of dimensional changes.

NOTE The accuracy of re-measurement of specimen dimensions will depend on the nature and extent of the

corrosion, particularly the degree of pitting or of skin formation. For materials which corrode bad

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