An electronic device according to various embodiments of the disclosure includes: a display; and a housing adjacent to the display, wherein at least a part of the housing includes: an aluminum alloy layer; a first film layer formed on the aluminum alloy layer; and a second film layer formed between the aluminum alloy layer and the first film layer and which includes multiple snowflake structures arranged adjacent to the first film layer. The first film layer is formed by a first anodizing process using a first voltage on the aluminum alloy layer, and the second film layer is formed by a second anodizing process using a second voltage on the aluminum alloy layer after the first anodizing process.

An electronic device according to various embodiments of the disclosure includes: a display; and a housing adjacent to the display, wherein at least a part of the housing includes: an aluminum alloy layer; a first film layer formed on the aluminum alloy layer; and a second film layer formed between the aluminum alloy layer and the first film layer and which includes multiple snowflake structures arranged adjacent to the first film layer. The first film layer is formed by a first anodizing process using a first voltage on the aluminum alloy layer, and the second film layer is formed by a second anodizing process using a second voltage on the aluminum alloy layer after the first anodizing process.

In an embodiment, a housing for an electronic device is colored through an anodizing process. The electronic device includes the housing, which includes a front plate; a rear plate facing away from the front plate; a side member surrounding a space between the front plate and the rear plate; and a support member which is disposed in the space. A portion of the housing is a conductive member formed of an electrically conductive material, which is divided into a first portion and a second portion which is electrically isolated from the first portion. The first portion is colored by a primary anodizing process with a first color, and the second portion is colored by a secondary anodizing process with a second color different from the first color.

In an embodiment, a housing for an electronic device is colored through an anodizing process. The electronic device includes the housing, which includes a front plate; a rear plate facing away from the front plate; a side member surrounding a space between the front plate and the rear plate; and a support member which is disposed in the space. A portion of the housing is a conductive member formed of an electrically conductive material, which is divided into a first portion and a second portion which is electrically isolated from the first portion. The first portion is colored by a primary anodizing process with a first color, and the second portion is colored by a secondary anodizing process with a second color different from the first color.

The disclosed embodiments include a housing of a handheld mobile device. The housing includes a ceramic layer forming a continuous outermost surface of the handheld mobile device, and an antenna layer adjacent to the ceramic layer. The antenna layer including conductive elements formed from a metal injection molded substrate, and an antenna break formed of non-conductive material electrically separating the conductive elements to collectively form an antenna of the handheld mobile device that is hidden by the ceramic layer from an exterior view of the handheld mobile device.

In a method, an aluminum body is chemically treated with at least one of an alkaline solution and an acid solution. Anode-oxidization is performed on the chemically treated aluminum body to form an aluminum oxide layer. The aluminum oxide layer is treated with hot water at a temperature more than 75° C. or steam. The aluminum oxide layer after being treated with hot water or steam includes plural columnar grains, and an average width of the columnar grains is in a range from 10 nm to 100 nm.

In a method, an aluminum body is chemically treated with at least one of an alkaline solution and an acid solution. Anode-oxidization is performed on the chemically treated aluminum body to form an aluminum oxide layer. The aluminum oxide layer is treated with hot water at a temperature more than 75° C. or steam. The aluminum oxide layer after being treated with hot water or steam includes plural columnar grains, and an average width of the columnar grains is in a range from 10 nm to 100 nm.

An article is disclosed that includes a first substrate of a first metal or metal alloy. An aluminum alloy first layer on a surface of the first substrate includes is galvanically less noble than the first metal or metal alloy. The first layer can also include elements alloyed with or in solid solution with the aluminum alloy, or can include a two or more phase composition including a first phase of aluminum and a second phase of a solid lubricant.

A housing of an electronic device is provided. The housing includes a first surface, a second surface, a side surface surrounding at least a portion of a space formed between the first surface and the second surface, a first surface layer formed by applying a first texture and a first color to a first area of at least one of the first surface, the second surface, and the side surface of the housing, and a second surface layer formed by applying a second texture and a second color to a second area within the first area, wherein at least one of the first surface layer and the second surface layer includes an oxide film layer.

An additive compound for dyeing an aluminum or aluminum alloy substrate after anodic oxidation to provide better uniformity in dyeing and hence a better finished appearance includes a main agent, an auxiliary agent, a pH stabilizer, and an antibacterial agent. The antibacterial agent includes at least one of sorbic acid, fluconazole, itraconazole, Artemisia argyi, benzyl alcohol, benzoic acid, salicylic acid, and boric acid. An additive solution and a dyeing method are also provided, the use of the compound also allows for a more rapid dyeing process.