Patent ID: 11920244
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  G  H | IPC C  G

Claim 10:
11. A method of forming a glossy surface on a device housing for an electronic device, the method comprising:
treating a magnesium-alloy substrate of the device housing to obtain a treatment layer over the magnesium-alloy substrate, wherein the treatment layer is one of:
an oxide layer having a thickness in a range of from about 3 μm to about 15 μm; or
a passivation layer formed to obtain a non-metallic surface over the magnesium-alloy substrate, wherein the passivation layer has a thickness in a range of from about 1 μm to about 5 μm;

applying a metallic coating layer over the treatment layer;
spray depositing a paint coating layer over the metallic coating layer, wherein the paint coating layer comprises:
a clear coating layer applied over the metallic coating layer;
a primer coating layer applied over the clear coating layer; and
a base coating layer applied over the primer coating layer;

cutting a part of the paint coating layer by one of diamond cutting and a laser cutting process to allow a portion of the metallic coating layer to be visible, to provide a metallic luster to the housing; and
applying a top coating layer over the paint coating layer and the second portion of the metallic coating layer.