COATING FILM AND AUTOMOTIVE PART ON WHICH COATING FILM IS FORMED, AND CONSTANT VELOCITY UNIVERSAL JOINT
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United States of America Patent
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Issued Date -
Jul 18, 2019
app pub date -
Mar 20, 2019
filing date -
Mar 20, 2019
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Abstract
The invention provides a coating film having excellent adhesion, even without a chemical conversion film treatment being carried out as an undercoat treatment, and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after forging, and tempering of the metal automotive part and bake-hardening of the deposited powder are carried out simultaneously, thereby forming a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened basis material surface that has been not subjected to a chemical conversion filming treatment.
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