NON-DESTRUCTIVE ADHESION TESTING OF COATING TO ENGINE CYLINDER BORE

摘要

Adhesion testing of coatings to the cylinder bore of an engine block. An adhesion testing fluid is dispensed from a nozzle that simultaneously rotates so that the fluid impinges about a substantial inner periphery defined by the coated cylinder bore. The performance of a referee coated engine block is used to provide parameters for one or more production-oriented engine blocks. This allows for rapid evaluation of a sizable sample of such production-oriented engine blocks. The fluid-dispensing nozzle is configured to simultaneously provide complete circumferential coverage of the cylinder bore with high-pressure/high-velocity fluid through rotational movement of the nozzle within the bore. By keeping the production-oriented engine blocks stationary during the test further improves testing efficiency.

主权项

1. A method of adhesion testing of a coating applied to at least one cylinder bore of an engine block, said method comprising:
preparing a referee coated cylinder bore with a coating that defines a minimum acceptable adhesion strength; impinging a first high velocity fluid against at least a portion of said referee and varying said first impingement intensity until a failure intensity is ascertained that substantially coincides with damage to said coating on said referee; measuring said failure intensity; and impinging a second high velocity fluid against a substantial circumferential entirety of a production-based coated cylinder bore, said circumferential impinging taking place through rotational movement of a fluid jet nozzle that is placed within said production-based coated cylinder bore that remains substantially stationary during said second high velocity fluid impinging, said fluid jet nozzle configured to deliver a second impingement intensity that is substantially similar to said failure intensity.