Aluminum Overview | Top Metal Co., Ltd. Taiwan

Aluminum Overview

1. Aluminum’s Characteristics
Aluminum is remarkable for its low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminum and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials. The most useful compounds of aluminum, at least on a weight basis, are the oxides and sulfates. Furthermore, aluminum is also very easy to recycle.


The most famous property of aluminum its light weight, with a density only one third of steel, 2.7 kg/m3.


Aluminum alloys commonly tensile are between 70 and 700 MPa. Aluminum does not become brittle at low temperatures. Instead, its strength increases. At high temperatures, aluminum’s strength decreases.


Aluminum is easily worked with machining methods – such as milling, drilling, cutting, punching, bending, etc.


Aluminum is an efficiently conductor of heat and electricity. An aluminum conductor is approximately half of copper conductor having the same conductivity.


Another of the properties of aluminum is that it is a good reflector of both visible light and radiated heat.

Corrosion resistance

Aluminum is easily reacted with the oxygen in the air and form an extremely thin layer of oxide. this layer is dense and provides excellent corrosion protection.

Anodising increases the thickness of the oxide layer and improves the strength of the natural corrosion protection.These aluminum is used in outdoors, the oxide layer thicknesses are between 15 and 25 um common.

Alloys of Aluminum

Beside the pure Aluminum, there are another type of Aluminum alloys which defined by ASTM, JIS, etc. The number of the Aluminum is depended on the others metal inside the Aluminum, the component affect strength, machining, corrosion resistance, etc.

1xxx series are essentially pure aluminum with a minimum 99% aluminum content by weight and can be work hardened.
2xxx series are alloyed with copper, can be precipitation hardened to strengths comparable to steel. Formerly referred to as duralumin, they were once the most common aerospace alloys, but were susceptible to stress corrosion cracking and are increasingly replaced by 7000 series in new designs.
3xxx series are alloyed with manganese, and can be work hardened.
4xxx series are alloyed with silicon. They are also known as silumin.
5xxx series are alloyed with magnesium.
6xxx series are alloyed with magnesium and silicon. They are easy to machine, are weldable, and can be precipitation hardened, but not to the high strengths that 2000 and 7000 can reach. 6061 alloy is one of the most commonly used general-purpose aluminium alloy.
7xxx series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminum alloy (tensile strength up to 700 MPa for the 7068 alloy).
8xxx series are alloyed with other elements which are not covered by other series. Aluminum-lithium alloys are an example
Forms of Aluminum
Bare Aluminum: We mainly supply anodizing quality A1050, A5052, A6061 0.5~1.2mm for mobile phone outer casings. Our customers are mainly fabricators and stamping houses, who supply products to HTC, Sony, Acer, ASUS, Nokia, and other electronics companies. Let us know if you’d like to see some detailed brochures.We also supply heavy gauge aluminum to manufacture semi-conductor equipment and bus bars.
our Suppliers:

Sumitomo, Nippon Light Metal, Aleris, CSAC, Novelis and some Chinese aluminum mills.

Mill Bright (Polished) Aluminum:

Current suppliers: Constellium, Alcoa
Applications: Lighting, automotive parts, nameplates, decorations
Available thicknesses in stock

0.3mm, 0.4mm and 0.5mm

Aluminum Foil:

Available specifications in stock:

A1100-O 0.12, 0.15 & 0.2mm

A1N30-O 0.05, 0.075 & 0.1mm

A5052-O 0.03, 0.04 & 0.05mm

A5056-O 0.035, 0.05, 0.08 & 0.10mm

Application: Speaker diaphragm
Sources: Taiwan, Japan & North America
4. Anodized Aluminum (methond&process from our PPT) it’s a important part of our company, the pictures in our PPT are aviliable to use in website.
What is anodizing?

Anodizing is a process of electrolytic passivation, greatly increasing and enhancing the oxide layer that naturally forms on aluminum.

What are the advantages of anodized aluminum?

An anodized surface actually improves the natural aluminum surface, making it more attractive, scratch resistant, corrosion resistant, andmaking it easy to apply colors.

What applications utilize anodized aluminum?

The number of applications is virtually unlimited. Some applications are: reflectors, appliances and automotive trims, decorative trims,signage, cookware, interior design, ceiling panels, nameplates, and electronic uses.

Why would someone choose anodized aluminum?

Anodized aluminum is chosen for its decorative and functional properties. It is a very effective solution for when bare or coated aluminumdoesn’t have sufficient performance, doesn’t provide sufficient protection, or doesn’t have the desired aesthetic properties.

Are there other metals other than aluminum that can be anodized?

Metals like magnesium and titanium can also be anodized, but they do not have the same advantages as anodized aluminum.

Is the anodizing process environmentally friendly?

The anodizing process is very environmentally friendly. Unlike other metal treatments, there are no heavy metals, halogens, or volatile chemicals used in the process. The anodized aluminum itself is 100% recyclable.

Does anodizing affect the mechanical properties of the aluminum substrate?

Generally speaking, anodizing has no effect on the mechanical properties of the aluminum substrate.

What aluminum alloys are recommended for anodizing?

ACA stocks high-purity alloys for the best anodized results. Typical alloys are 1090, 5657, 5005, and 5205.

Is an anodized surface easy to clean?

Anodized aluminum can be easily cleaned with most common cleaning solutions, or even just water. Caustic solutions should be avoided.

Can anodized aluminum be easily formed?

Anodized aluminum can be easily formed. Severe forming can cause crazing, a whitening of the anodized layer as it is stretched that can be visually objectionable.

Does ACA only sell anodized coils and sheets?

While virtually any aluminum shape can be anodized, ACA is a continuous coil anodizer, which means we anodize only coiled aluminum. ACA sells coils, sheets, and blanks.

What is bright dipping?

Bright dipping, or chemical brightening, is an electrochemical process that smoothens and brightens the surface of the aluminum sheet.

Is anodized a superior surface for bonding/laminating?

Conventional anodized aluminum is an excellent substrate for coating, bonding, or laminating. In addition, ACA manufactures UltraBond, a very special anodized surface that provides the ultimate in adhesion.

Why is anodized aluminum the preferred surface for commercial lighting applications?

The durable, highly reflective, static-free surface of anodized aluminum his preferred for its high performance at economical cost. Anodized aluminum can be stamped, cut, and formed without fear of the finish scratching, peeling, or cracking.

What is total reflectance (TR)?

Total reflectance is the measure of the total amount visible light that is reflected off a surface.

What is specular reflectance?

Specular Reflectance is the reflection of light from a surface in which light from a single incoming direction is reflected in a single outgoing direction, without diffusion of light.

Does ACA carry other lighting finishes besides anodized aluminum?

In addition to a wide variety of anodized aluminum surfaces, ACA also supplies Super UltraWhite 95 Series

(95 Min TR), Super UltraBrite 95 (PVD – Physical Vapor Deposition) high reflectance enhanced aluminum on a variety of surfaces, High Reflectance Gloss White Painted aluminum, Specular+ (97%TR laminate on steel or aluminum)


Pre-Treatment: Cleaning is done in a non-etching, alkaline detergent heated to approximately 145 degrees Fahrenheit. This process removes accumulated contaminants and light oils.
Rinsing: Multiple rinses, some using strictly de-ionized water, follow each process step.
Etching (Chemical Milling): Etching in caustic soda (sodium hydroxide) prepares the aluminum for anodizing by chemically removing a thin layer of aluminum. This alkaline bath gives the aluminum surface a matte appearance. Bright dipping will enhance an already bright aluminum surface, and result in varying degrees of reflective finishes.
(De-smutting): Rinsing in an acidic solution removes unwanted surface alloy constituent particles not removed by the etching process.
Anodizing: Aluminum is immersed in a tank containing an electrolyte having a 15% sulfuric acid concentration. Electric current is passed through the electrolyte and the aluminum is made the anode in this electrolytic cell; the tank is the cathode. Voltage applied across the anode and cathode causes negatively charged anions to migrate to the anode where the oxygen in the anions combines with the aluminum to form aluminum oxide (Al2O3).
Coloring: Anodic films are well suited to a variety of coloring methods including absorptive dyeing, both organic and inorganic dyestuffs, and electrolytic coloring, both the Sandocolor® and Anolok® processes.
Sealing: Throughout the anodizing process, the proper sealing of the porous oxide coating is absolutely essential to the satisfactory performance of the coating. The pores must be rendered nonabsorbent to provide maximum resistance to corrosion and stains. This is accomplished through a hydrothermal treatment in proprietary chemical baths or by capping the pores via the precipitation of metal salts in the pore openings.

5. how to choose the material(using guide)-this can be used in other type matel, such as stainless steel and titanium…..etc, so I think it must be a independent field not only belong to the field of aluminium.
(1)certain metal : provide us the number of the material you know such as :A1100, A5056, A6061, SUS304, SUS316, SUS430……etc. If you do not know the name of the certain metal , you can provide us the Specification, mechanical properties, and so on. Let us help you to find the metals you want.
(2)Specification (chemical compostion): the component inside the metals, even a small amount of atom can decide the metal type. You can provide your requestion, we will find a suitable material for you.
(3)mechanical properties : provide the mechanical properties you need , such as Ultimate Tensile Strength, Yield Strength, Elongation, Electrical Conductivity, Elastic Modulus ….etc .
(4)thickness/width: the tickness range of our products are very wide, width is also can be asked.
(5)finish: such as andoized, polished.
(6)physical properties : Hardness, color…etc.