公开(公告)号：US20180073159A1

公开(公告)日：2018-03-15

申请号：US15261699

申请日：2016-09-09

Applicant: Apple Inc.

Inventor： James A. CURRAN ,  Herng-Jeng JOU ,  James A. WRIGHT

IPC: C25D11/04 ,  C25D11/14

CPC classification number: C25D11/14 ,  C25D11/16 ,  C25D11/243 ,  C25D11/246 ,  C25D11/26

Abstract: Coatings for titanium and titanium alloy substrates are described. The coatings can include an aluminum oxide layer and, in some cases, a thin titanium oxide layer. If the coating includes a titanium oxide layer, the aluminum oxide layer can cover and protect the titanium oxide layer from abrasion and scratching. In some examples, the titanium oxide layer has a thickness sufficient to provide a color by thin-film interference, which can be visible through the overlying aluminum oxide layer. In some embodiments, the aluminum oxide layer is colorized using an anodic dye, pigment or metal colorant, which can combine with interference colors of the titanium oxide layer.