ISO 14916:2017
Thermal spraying — Determination of tensile adhesive strength
ISO 14916:2017 specifies the procedure to determine the tensile adhesive strength of thermally sprayed coatings under tension in the direction normal to the surface of the coating by applying a tensile test. By using this procedure, comparability of the test results is ensured.
The test is intended to determine the tensile adhesive strength between the thermally sprayed coating and the substrate material or between the bond and top coat and/or of the cohesive strength of the related coat of the coating system. In some cases, thermally sprayed coatings might have more than two layers. The method specified in this document applies also to determine the tensile adhesive strength between the interfaces of different layers in a coating system which consists of more than two layers.
This test is sufficient to compare coatings manufactured using same or similar feedstock materials and thermal spray processes with each other. The tensile adhesive strength test is not intended to provide absolute values for evaluation of the durability of coatings under operational use.
The test is used to assess the influence of substrate preparation, the spraying conditions and the process parameter on the tensile adhesive strength of thermally sprayed coatings. It can also be employed in order to monitor the consistency of the manufacturing and spraying processes.
NOTE This tensile test can also be applied to very thin coatings. Moreover, the infiltration of bonding agent into the thermally sprayed coatings containing a required level of porosity can be minimized using an appropriate bonding agent (foil rather than liquid). For further instructions, please refer to 6.5.3. This tensile test is inappropriate for determining the adhesive strength of fused spray coatings deposited using self-fluxing alloys due to their inherent high adhesion strength values.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Equipment for testing and measuring and auxiliary equipment
5.1 Test instruments
5.2 Measurement instrument
5.3 Specimen fixing device for bonding of the tensile adhesive specimen
6 Specimens
6.1 Shape of specimens
6.2 Material of the specimen
6.3 Preparing the substrate and loading blocks
6.4 Preparing and spraying of the specimen
6.5 Manufacture of the specimens for tensile testing
6.5.1 Machining of the coated substrate block (or test disc) and preparation for bonding
6.5.2 Gluing the specimen
6.5.3 Bonding agent
6.6 Reference specimen
6.7 Number of specimens to be tested
7 Applying the testing
8 Measurement readings and evaluation
9 Test report — Documentation
10 Possible sources of fault when preparing the specimens and on testing
Annex A (informative) Work instructions for gluing
Annex B (informative) Recommendations for further auxiliary equipment
Annex C (informative) Function areas on the tensile adhesive specimen and possibilities of fracture locations according to ASTM C633-13
Annex D (informative) Record for the applied tensile adhesive test according to this document
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Equipment for testing and measuring and auxiliary equipment
5.1 Test instruments
5.2 Measurement instrument
5.3 Specimen fixing device for bonding of the tensile adhesive specimen
6 Specimens
6.1 Shape of specimens
6.2 Material of the specimen
6.3 Preparing the substrate and loading blocks
6.4 Preparing and spraying of the specimen
6.5 Manufacture of the specimens for tensile testing
6.5.1 Machining of the coated substrate block (or test disc) and preparation for bonding
6.5.2 Gluing the specimen
6.5.3 Bonding agent
6.6 Reference specimen
6.7 Number of specimens to be tested
7 Applying the testing
8 Measurement readings and evaluation
9 Test report — Documentation
10 Possible sources of fault when preparing the specimens and on testing
Annex A (informative) Work instructions for gluing
Annex B (informative) Recommendations for further auxiliary equipment
Annex C (informative) Function areas on the tensile adhesive specimen and possibilities of fracture locations according to ASTM C633-13
Annex D (informative) Record for the applied tensile adhesive test according to this document
Bibliography