ASTM C633 – Adhesion or Cohesion Strength of Thermal Spray Coatings
ASTM C633 – This test method covers the determination of the degree of adhesion (bonding strength) of a coating to a substrate or the cohesion strength of the coating
in a tension norma to the surface.
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ASTM C633 – ADHESION OR COHESION STRENGTH OF THERMAL SPRAY COATINGS
ASTM C633 – This test method covers the determination of the degree of adhesion (bonding strength) of a coating to a substrate or the cohesion strength of the
coating in a tension norma to the surface.
The test consists of coating one face of a substrate fixture, bonding this coating to the face of a loading fixture, and subjecting this assembly of coating and fixtures to
a tensile load normal to the plane of the coating.
It is adapted particularly for testing coatings applied by thermal spray, which is defined to include the combustion flame, plasma arc, two-wire arc, high-velocity
oxygen fuel, and detonation processes for spraying feedstock, which may be in the form of, wire, rod, or powder.
NOTE 1: Thermal spray coating materials include ceramics, such as metal oxides or carbides, and metals. In some cases, a coating is formed of different spray
materials, such as an oxide layer sprayed onto a sprayed metal-bonding layer.
The substrate generally is a metal, but may be a ceramic, such as an oxide or graphite.
Significance and Use
This test method is recommended for quality control, acceptance testing; or it may help to develop or qualify a thermal spray operator’s equipment and procedure
or to aid in developing thermal spray coatings with improved adhesion and integrity.
Bonding strength of thermal spray determines the adhesive strength between the coating and substrate.
This is determined with a peel test. Cohesion strength of thermal spray is a measurement of tensile strength of the adhesive coating.
*** Electromechanical universal test machine can be used to measure cohesion strength of a coating.
*** ASTM C633 Bond Strength Fixture Thermal Spray can be used for this test
***PARSROS offers several types of grips and fixtures which will enable you to perform a variety of tests
that are accurate and repeatable.
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