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Alumite, Aluminum Chemical Conversion Treatment, Plating Surface Treatment Technology

Proposal to Improve

the Value of Aluminum

Aluminum is an excellent metal that is light, strong, recyclable, and accommodates to various shapes. Used widely across industrial products, and daily necessities, Aluminum is the 2nd most produced metal in the world after iron.

On the other hand, Aluminum is softer and more prone to damage than iron,and corrodes under certain environments. Surface treatment compensates for these drawbacks. Properties such as hardening can be added to improve corrosion resistance and provide better aesthetics. This we believe, adds significant value to Aluminum.

Silvec has been studying/researching Aluminum surface treatment for many years in Japan. With a good understanding of the nature of Aluminum, we are able to make appropriate surface treatments, thus, improving the value of Aluminum.

─ Aluminum Charactristics ─

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─Proposal for Improvment value of Aluminum─

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Improving Corrosion Resistance

Improving Surface Hardness

Improving Appearance

Products that utilize high electrical conductivity

Add solderability

to light metal properties

Specification proposal

based on VA / VE proposal

Further enhance the electromagnetic

shielding performance of aluminum

A heat sink that utilizes Aluminum’s heat conduction performance


Characteristics of Aluminium

   Light in Weight



Aluminum weighs 2.7, which is about 1/3 lighter than iron (7.8) / copper (8.9). This contributes to saving energy- significantly improving cars, airplanes, trains, etc., making it an environmentally friendly metal.




The hardness of each aluminum alloy is soft at “A105: HV19”, “A5052-H32: HV60”, “A6063-T6: HV73”.

   High Strength



The tensile strength of pure aluminum (A1000 series) is not powerful, but can be easily strengthened through the rolling process. Among alloys, there are aluminum with strength comparable to steel, such as duralumin (A2000 series) and super duralumin (A7000 series).

   Good Processability



Aluminum can be easily processed by rolling, bending, drawing and cutting, thus used widely for die and lost wax casting. Even a thin product can be manufactured by heating and extruding the die at a high pressure, similar to the extrusion process.

   Good Thermal Conductivity



The thermal conductivity of metals are good in the order of ‘silver> copper> gold> aluminum.’ The thermal conductivity of Aluminium is three times that of iron. In addition, the metal specific gravity is about 1/3 that of silver and copper, so it is used as a heat dissipation component for various products (heat sinks, etc.).

  Good Electrical Conductivity



The electrical conductivity of aluminum is good in the order of “silver> copper> gold> aluminum”. Although conductivity is lower than that of copper, the specific gravity of Aluminium is 1/3 lighter, making it possible to conduct twice as much electricity in comparison to copper wire in the same amount. Aluminum can also be used for electric wires, electrodes, and bus bars.

  Resistant to Low Temperature



Aluminum is suitable for structural materials in low-temperature environments because it is strong at low temperatures and maintains its strength even at extremely low temperatures of -200 ° C. Copper is not suitable for structural materials because it becomes brittle at temperatures below -62 ° C.




For aluminum, the energy required to regenerate from a dissolved state is 1/28 of the energy required to produce new aluminum bullion. Aluminum has a high scrap value.




Aluminum is a non-toxic metal used in cooking utensils and beverage cans.

  Non- Magnetic



Aluminum is a non-magnetic metal that does not stick to magnets. Given its weight, they are suitable for electromagnetic shielding plates that protect against external magnetic field lines, and noise radio waves.


Proposal to Improve the Value of Aluminum

   Improving Corrosion Resistance



Aluminum naturally combines with oxygen in the air to form a thin oxide film. Although the metal already has excellent corrosion resistance due to its oxide film, surface treatment can help boost corrosion resistance. The type of surface treatment recommended varies depending on the application and required quality, but corrosion resistance can be improved with any treatment including anodizing, chemical conversion and plating.

  Improving Surface Hardness



Aluminum has sufficient strength enough to be used in structures, but it is also a soft metal. Heat treatments can harden the metal, but surface treatment is required to make it harder. Our standard anodize can increase hardness to HV200, hard anodize can increase to HV400 or higher, and with nickel chrome plating to HV800 or higher.

  Improving Appearance



Aluminum has a beautiful appearance as it is. However, the look can be further improved by anodizing or plating. Depending on the appearance of various metal colors with a mirror finish or matte texture, and the type of aluminum alloy, Aluminum can be turned into a variety of colors with a beautiful metal texture by anodizing and dyeing. It also maintains and ensures corrosion resistance and strength.

  Products that utilize high electrical conductivity



Aluminum ranks fourth in electrical conductivity among all metals. However, if Aluminum material is left as it is, the metal forms high contact electrical resistance due to the naturally formed oxide film. Thus, plating a metal film with low contact electrical resistance, make aluminum products light and more conductive. (Ex. Aluminum electrode, bus bar, etc.)

  Add solderability to light metal properties



While it is ideal to make components that utilize Aluminum’s lightness and ease of processing, when positioning products by soldering, it is impossible to do so on Aluminum surfaces. In such cases, aluminum components can be soldered by changing the plating suitable for soldering aluminum. We offer nickel plating, which has long been used for soldering purposes for its high solder wettability and tin plating.

  Further enhance the electromagnetic shielding performance of aluminum



Aluminum has the ability to shield electromagnetic waves. However, there is a copper plating process to further enhance this shielding performance. As a result, it has been evaluated and adopted as having enhanced electromagnetic wave shielding properties in a wide frequency band.

  A heat sink that utilizes Aluminum’s heat conduction performance



Aluminum is ranked 4th among metals with good thermal conductivity, and is often used as a heat sink material because of its light weight. It is

  Specification proposal based on VA / VE proposal



not the case where heat conduction performance increases when anodized. In fact, the alumite film is inferior in heat traditional performance compared to pure aluminum material. The reason why the alumite film is adopted for the heat sink is because the alumite film increases the emissivity and enhances the heat dissipation effect.

Whether the emissivity be increased or to simply use a thermal conductive material depends on the environment to be used. There are also performance changes depending on the thickness of the alumite film and on the aluminum material. If you want to use the performance of aluminum materials as is, we recommend a chemical conversion treatment of aluminum.

Aluminum die-casting heat sinks that can make complex shapes require surface treatment such as alumite or chemical conversion treatment. Even if increased emissivity is not necessary, the performance often deteriorates due to corrosion. In any case, we believe that surface treatment is crucial for high performance heat sinks.

・We offer to take part from the time of product planning to better propose specifications and shapes that do not cause defects prior to the launch. We then make proposals that satisfy required functions while reducing costs, and in some cases, introducing materials that best fit the customers’ needs.

・We are able to propose specifications that can reduce costs, based on the current specifications and required quality. The proposal from the standpoint of knowing the relationship between the characteristics of aluminum and the surface treatment contributes to the improvement of the value of aluminum.


Latest Update 02 Jun 2020
Plating, Anodize
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