Aluminum Alloy Housing Anodizing for Glossy Pearl Textures

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Solution Overview

Problem

Existing anodizing processes for aluminum alloy materials used in electronic device exteriors face limitations in achieving various texture and color implementations due to gloss restrictions, requiring additional processes like sanding or etching, which increase costs and quality management difficulties.

Innovation Solution

A method involving a two-step anodizing process with primary and secondary variable constant voltages is applied to form a glossy pearl appearance on aluminum alloy exteriors, eliminating the need for additional physical or chemical processes and ensuring stable quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional anodizing process is used, then aluminum alloy surface can be protected and basic aesthetic appearance can be achieved, but various textures and colors cannot be implemented due to gloss restrictions

Engineering Contradiction:

Improvetexture and color implementationVSAvoidsurface gloss control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The anodizing process is divided into multiple sequential stages with different voltage parameters. The first anodizing forms an initial oxide film, followed by a second anodizing that creates a distinct second oxide film layer. This segmentation allows each stage to contribute differently to the final surface properties, enabling both texture variation and color implementation while controlling gloss.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes parameter changes by applying different voltage values in different anodizing stages. The first anodizing uses a first voltage to create specific oxide film characteristics, while the second anodizing uses a second voltage to create different characteristics. This parameter variation enables diverse texture and color outcomes without compromising surface quality or requiring additional processes.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If additional processes like sanding or etching are applied to achieve various textures, then texture diversity can be improved, but manufacturing costs increase and quality management becomes difficult

Engineering Contradiction:

Improvetexture varietyVSAvoidnumber of processing steps

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple functions into the anodizing process itself. By carefully controlling the anodizing parameters and sequence, the process simultaneously achieves protection, aesthetic appearance, and diverse textures in a single integrated treatment rather than requiring separate sanding, etching, or other post-processing steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The anodizing process is designed to be universal and multi-functional. It provides corrosion protection, aesthetic appearance, and diverse textures all through one process, eliminating the need for multiple specialized processes and simplifying manufacturing while maintaining quality consistency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If additional physical or chemical processes are used to achieve various textures, then texture implementation can be improved, but manufacturing costs increase

Engineering Contradiction:

Improvetexture implementation capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent maintains continuity of useful action by performing multiple anodizing treatments in sequence without interrupting the protective film formation process. The first anodizing creates an initial oxide film, and the second anodizing continues the oxidation process to create a second oxide film with different properties, achieving diverse textures continuously without stopping for additional processes.

Inventive Principle:

Principle #20Continuity of useful action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for the implementation of various textures and colors without additional costs, maintaining the advantages of anodizing techniques while ensuring consistent quality.

Implementation Method 1

a first film layer formed by a first anodizing process using a first voltage on the aluminum alloy layer, and a second film layer formed by a second anodizing process using a second voltage on the aluminum alloy layer after the first anodizing process

Methodology Applied

Scientific EffectAnodizing: Anodising

Implementation Method 2

the metal surface is oxidized by oxygen generated from the positive electrode, thereby generating an aluminum oxide film

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS12576616B2Aluminum alloy sheet and manufacturing method thereof

Publication Date: 2026.03.17 SAMSUNG ELECTRONICS CO LTD

AI summary

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.