Aluminum & Alloys

Aluminum and its alloys are of vast use in various industries. Anode treatments of Aluminum, like Conventional or Hard Aluminum Anodize, Coloring Aluminum Anodize using dyes, etc., are huge industries dealing with construction etc. parts of big dimensions.
Finish Line’s capabilities and interests cover Electro-polishing of Aluminum for precision mechanics, optics, electronics, medical devices, aimed their bright decoration appearance, corrosion resistance and surface smoothing and defects removing. Electro-polishing of Aluminum is less common and less well-known process, but in the above areas of technology, it finds more and more applications.
Base approach, how to define Electrolyte composition and Electro-polishing parameters for Aluminum, are common for all its alloys, and determined by its amphoteric properties. However, the special conditions of each particular Electro-polishing process change significantly from one series of Aluminum Alloy to other.
For example, Al 2000 Copper alloyed series, when electro-polished in a bath granting lustrous appearance to magnesium and silicon alloyed Al 6000 series, become matte and dull. An electrolyte giving brightness and smoothness to 99% Aluminum 1000 series leads to etching and roughness of Al 7000 series which alloyed with zinc, etc. Tempering history of an Aluminum Alloy (hardening, annealing, stretching etc.) has substantial impact on its electro-polishing abilities as well. Depending on the composition of the metal and its technological history, Electro-polishing Process parameters can be diametrically changed, including the replacement of acidic bath by alkaline one.
Finish Line offers commercially validated Electro-polishing Process for Al 6000 and Al 2000 series with Electro-polishing line having a capacity of thousands units per day, see example. Electropolishing of Aluminum parts made from any Aluminum Alloy may be easily adjusted for customer’s needs and commercially served at the same line.

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Anode Treatment

Anode treatment beneficiates metal surface through metal dissolving and oxidation. In case no coating is allowed, Anode Treatment is a way to enhance your parts’ surface qualities. more >>


Passivation is a classic anode treatment to improve corrosion resistance of metals, comparing to not treated parts, through completing natural formation of metal oxides surface layer. more >>

Bright Passivation

Bright Passivation improves corrosion resistance of metals, comparing to not treated parts, removes spots from previous processing and provides the parts with brighter appearance. more >>


Etching is an old craft which technically comprises a vigorous anode treatment process, widely exploited in industry. Etching metal surface as a whole makes it uniformly rough and porous more >>

Color Anodizing

Color Anodizing is a unique Titanium only applied process granting to metal surface a wide spectrum of controllable vivid interference colors, which are stable, uniform and repeatable more >>

Surface preparation

Surface preparation ensures the after Anode Treatment surface features as aimed. It includes both quality improving (like de-burring) and surface beneficiation (like surface roughening) more >>

Surface cleaning

Surface Cleaning is an essential completing operation after any Anode Treatment intended washing the surface from leftovers of previous treatment, using purified water at the end step more >>

Clean Room Packing

Packing in Clean Room class 1000 with laminar cameras class 100 allows us to implement packaging procedure for customers’ products having the highest cleanness requirements more >>