An aluminum member (1) includes: a base material (2) composed of aluminum or an aluminum alloy; and an anodic oxide film (3) formed on a surface of the base material. The anodic oxide film includes: an amorphous layer (31), which is composed of an amorphous aluminum oxide and is formed on the base material (2); and a crystal layer (32), which is composed of a crystalline aluminum oxide and is formed on the amorphous layer (31). The aluminum member (1) can be obtained by forming the anodic oxide film (3) on the base material (2) by performing an anodization process on the base material (2) in an electrolytic solution, which contains boron atoms and has a pH of 7.0-12.0.

An aluminum member (1) includes: a base material (2) composed of aluminum or an aluminum alloy; and an anodic oxide film (3) formed on a surface of the base material. The anodic oxide film includes: an amorphous layer (31), which is composed of an amorphous aluminum oxide and is formed on the base material (2); and a crystal layer (32), which is composed of a crystalline aluminum oxide and is formed on the amorphous layer (31). The aluminum member (1) can be obtained by forming the anodic oxide film (3) on the base material (2) by performing an anodization process on the base material (2) in an electrolytic solution, which contains boron atoms and has a pH of 7.0-12.0.

A method for creating colorful patterns on a metal surface by using colorless ink is revealed. First carry out a first anodizing process on a metal substrate to form a first anodic oxide layer on a surface of the metal substrate. Then coat a layer of colorless ink on the first anodic oxide layer on the surface of the metal substrate to form a colorless ink pattern mask. Later perform a second anodizing process to form a second anodic oxide layer on a part of the metal substrate without being covered with the colorless ink pattern mask. Next remove the colorless ink pattern mask and coat a metal film over the first anodic oxide layer and the second anodic oxide layer to get a colorful pattern on the metal substrate.

An article of manufacture for providing multi-colored aluminum spirals for document and book binding is disclosed. The article being a spiral made from a length of wire having a specified gauge that is processed by one or more drive rollers coupled to a forming machine using a method of manufacture. The method sets a pitch value for a manufactured spiral on a forming machine, sets a diameter value for the manufactured spiral on the forming machine, receives the length of wire by one or more drive rollers, processes the length of wire by the forming machine using the set pitch value and the set diameter value to create the spiral, dips a first portion of the spiral into a first anodizing solution, and dips one or more additional portions into additional anodizing solutions after the first anodizing solution has set.

There is disclosed a method of forming a high luminosity inorganic coating on an aluminium or aluminium alloy article, wherein the article is immersed in an electrolyte and subjected to a plasma anodising process, wherein the coating has a luminosity L*≥80.0% and comprises at least 50 wt % gamma alumina. Also disclosed are inorganic coatings formed by the method, and aluminium or aluminium alloys coated by the method.

There is disclosed a method of forming a high luminosity inorganic coating on an aluminium or aluminium alloy article, wherein the article is immersed in an electrolyte and subjected to a plasma anodising process, wherein the coating has a luminosity L*≥80.0% and comprises at least 50 wt % gamma alumina. Also disclosed are inorganic coatings formed by the method, and aluminium or aluminium alloys coated by the method.

The present invention provides a photoluminescent aluminum alloy which exhibits high mechanical properties and which suppresses, to a high degree, the occurrence of color unevenness in cases where a tungsten-containing aluminum alloy die-cast material is subjected to anodization. Also provided is a photoluminescent aluminum alloy die-cast material produced using the photoluminescent aluminum alloy. This aluminum alloy contains 0.5-3.0 mass % of Mn, 0.3-2.0 mass % of Mg, 0.01-1.0 mass % of W and 1.0-3.0 mass % of Zn, with the remainder comprising aluminum and unavoidable impurities.

The present invention provides a photoluminescent aluminum alloy which exhibits high mechanical properties and which suppresses, to a high degree, the occurrence of color unevenness in cases where a tungsten-containing aluminum alloy die-cast material is subjected to anodization. Also provided is a photoluminescent aluminum alloy die-cast material produced using the photoluminescent aluminum alloy. This aluminum alloy contains 0.5-3.0 mass % of Mn, 0.3-2.0 mass % of Mg, 0.01-1.0 mass % of W and 1.0-3.0 mass % of Zn, with the remainder comprising aluminum and unavoidable impurities.

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.