Titanium surfaces with improved color consistency and resistance to color change
This application relates to a method for forming an enclosure for a portable electronic device. The enclosure includes a metal substrate having a first b* value. The method includes forming an anodized layer that overlays and is formed from the metal substrate, wherein the anodized layer has a second b* value that is no greater than 0.3 of the first b* value and no less than 0.3 less than the first *b value.
1. An enclosure for a portable electronic device, the enclosure comprising:
an anodized layer that overlays and is formed from a substrate comprising titanium, the anodized layer having a thickness between 2 nanometers and 6 nanometers, a b* value that is between 3 and 8, and an L* value that is above 60.
2. The enclosure of claim 1 , wherein the anodized layer has a substantially uniform arrangement of pores.
3. The enclosure of claim 1 , further comprising:
an adhesion layer that overlays the anodized layer; and
a fluoropolymer layer that is adhered to the anodized layer via the adhesion layer.
4. The enclosure of claim 1 , wherein the substrate is a titanium alloy.