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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology
Presentation Title Study on the Anodic Oxidation Surface Defects of Aluminium Alloys Used for Mobile Phone Shells
Author(s) Guo Shijie, Hiromi Nagaumi
On-Site Speaker (Planned) Guo Shijie
Abstract Scope The 6063 aluminum alloys are usually used to produce the smart phone shells because of good mechanical properties and high surface qulitiy. The billets were produced in the direct-chill casting process and extruded into sheets. After machining and anodic oxidation coloring, the phone shell of aluminum alloy was produced. However, many defects, especially closely arranged long strip and randomly appeared strips were usually observed on the finished surface of the mobile phone shells, which resulted in a huge material waste. This paper characterized the causes of surface defects and considered that the particles of the inclusions remained in the melt is the main reasons that resulted in the strips defects formation, not only distributed on the surface, but also inside the phone shells. MgO, A12O3, spinel (MgA12O4) and Ti containing particles are the main inclusions that present inside the melt and have a strong deleterious effect on the surface smoothness.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A New Aluminium Crucible Skimmer (ACS) for Smelter Plants – Main Benefits Further to Two Years of Experimentation in Industrial Environment
An Innovative Ultrasonic Technology for the Continuous Quality Monitoring of Liquid Aluminum on Casting Lines
Analysis of Laser Marking Performance on Various Non-ferrous Metals
Condensation Warning System for Dry Material Storage
Constellium’s R&D on the Use of Power Ultrasound in Liquid Aluminum: An Overview
Continuous Casted Aluminum Flat Products Corrosion Characteristic According to Downstream Process
Continuous Centrifugal Casting: A Revolutionary Process for Casting Aluminium Tubes
Controlling the Microstructural Evolution during Soft Annealing of Cold Rolled Twin-roll Cast AlMnMg Alloys by Homogenization Heat Treatment
Development of a Prototype Unit for Continuous Centrifugal Casting of Aluminium Tubes
Discussion of Bi-film Index and LiMCA Data in Industrial Aluminum Remelting Trials
Drive-in Feeding of Crucibles for Casting Machine
Effect of Ultrasonic Melt-treatment and Cooling Rate on Microstructure of Multi-phase Reinforced Al Alloy
Electrochemical Characterization of Al-Li-Cu-Mg Alloys
Evaluation of Stress Relief Processes Used on High Pressure Aluminum Die Casting Dies
Experimental Study and Numerical Analysis of Cracking during DC Casting of Large Dimension 7075 Aluminium Billets
In-line Salt Fluxing Process with an FFDTM Industrial Experience with a Box-Type Degasser
Inclusion Composition Determination by In-line LIBS Measurement – Plant Assessment
Innovative technology for a flawless rolling slab casting process
Introduction and Distribution of Non-metallic Nanoparticles in Aluminum Melt
Investigation of Elemental Distribution in the Sheet Sections after Aluminum Continuous Sheet Casting, Cold Rolling and Heat Treatment Processes
Molten Metal Cleanliness: Recent Developments to Improve Measurement Reliability
Nitridation Reaction of Aluminum and Magnesium in 5XXX Series Aluminum Alloy
On-site Benchmark of LiMCA II vs. LiMCA III for Monitoring of Non-metallic Inclusions in Liquid Aluminium
Robustness of Forged Part Mechanical Properties to Casting, Forging and Heat Treating Process Variation
Root Cause Analysis Findings of a Force 3 Explosion.
Shaping the Mechanical Properties of AlSi30 Alloy Cast by Rapid Solidification
Study of the Effect of the Surface-roughness of Dies and Tooling for HPDC on Soldering
Tailoring the Materials Properties with a Holistic Approach From Casting to Back Annealing
The Benefits of Ultrasonic Treatment of Molten Metal for Slabs Casting at UC RUSAL Facilities
The Comparison of Intensive Riser Cooling of Castings after Solidification in Three Classic Metals
The "Alcoa Filter System": A Cost Effective Solution for Enhanced CFF Performance
Ultrasonic Doppler Velocimetry in Liquid Aluminum
XPS Examination of the Oxide-Metal Interface of an Aluminum-Magnesium Alloy Containing Beryllium

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