TWI Coating Adhesion Testing (ASTM C633)

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The facility tests the adhesion of thermal spray coatings to the substrate they are deposited on. Coatings may be deposited by plasma spraying, high-velocity oxyfuel spraying, cold spraying, flame spraying, twin wire arc spraying and a number of other techniques. Standard stubs are adhered to the coating and the force required to detach the coating from the substrate is measured. This test is carried out according to the standard ASTM C633. While the facility can apply high loads (several kN), these are not typically needed as the stresses required to detach the coatings are of the order of 10-30MPa at most. TWI also has the facility to carry out these tests on-site or on larger structures but this is outside ASTM C633

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ASTM C633 testing

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