公开(公告)号：US20210348294A1

公开(公告)日：2021-11-11

申请号：US16952206

申请日：2020-11-19

Applicant: Apple Inc.

Inventor： Zechariah D. FEINBERG ,  James A. CURRAN ,  Todd S. MINTZ ,  Justin MEMAR-MAKHSOUS

IPC: C25D11/26

Abstract: An enclosure for a portable electronic device can include a titanium substrate defining a textured surface and a nominal surface. The titanium substrate can include a first region that extends above the nominal surface and a second region adjacent to the first region and extending below the nominal surface. A separation distance between an apex of the first region and a bottom of a trough defined by the second region can be at least 1 micrometer. A metal oxide layer can overlay the trough defined by the second region.