The design, manufacturing, supply and installation of automated aluminium anodizing lines
Galvatek supplies automated anodizing systems mainly to the aviation and aluminium industries. In the aviation industry, automated aluminium surface treatment plants are used for the chemical treatment of challenging aircraft parts and frame components. Aluminium anodizing plants can also be combined with etching, cleaning and non-destructive testing (NDT) processes. In the aluminium industry, the process often also includes electro-coloring for the production of aluminium profiles and components.
Aluminium anodizing process with CAA, SAA, BSAA, TSAA and PAA
Galvatek’s anodising plants for the aviation industry are mainly used for high-grade aircraft parts, aerostructures and other aluminium components. Anodizing plants for the aluminium industry are typically designed for the high-capacity anodizing of profiles.
Anodizing is an electrolytic passivation process that is used to increase the thickness of the natural oxide layer on the surface of metal parts. Aluminium alloys are anodized to increase corrosion resistance and surface hardness, as well as to allow dyeing (colouring), improved lubrication, or improved adhesion. Different anodizing processes include hard anodizing, chromic acid anodizing (CAA), sulphuric acid anodizing (SAA), boric sulphuric acid anodizing (BSAA), tartaric sulphuric acid anodizing (TSAA) and phosphoric acid anodizing (PAA), all of which are made possible by Galvatek anodizing plants.
Anodizing plant functions, technical solutions
Galvatek aluminium finishing plants are typically fully automated turnkey deliveries that utilise our latest technologies in ventilation, multiple loading/unloading stations, and energy-efficient solutions. Our state-of-the-art Galcont control system ensures extremely accurate film thicknesses. Anodizing tanks are typically supplemented by degreasing, rinsing, etching, desmut, and hot sealing, as well as electro coloring tanks/stations. Galcont control system also constantly records individual treatment and alarm history, which helps our customers in ther anodizing process certification, such as NADCAP approval used in the aviation industry.
Galvatek anodizing plants are always scaled and designed according to the needs of the customer and the maximum product dimensions in the treatment process. Galvatek has delivered tanks up to 15 meters in length, especially for aerostructure applications. Typically the tank length is 9 meters or less for aluminium profiles or other anodized aluminium components.
Tartaric sulphuric acid anodizing (TSA)
Tartaric sulphuric acid (TSA) anodizing provides excellent corrosion protection and paint bonding properties for a wide range of aluminium alloys. TSA anodizing can be used to replace the use of hexavalent chromium in chromic acid anodizing (CAA) processes. TSA anodizing is an approved method that complies with European Union REACH legislation. Further information about TSA anodizing is available on the Airbus website. In recent years Galvatek has been active in several new TSA plant projects, as well as in upgrading our installed base to TSA.
Chromic Acid Anodizing (CAA) – Type 1
Chromic acid anodizing (CAA) was the first commercial type of anodizing and is still widely used in aerospace and defence applications. CAA is compatible with many aluminium alloys. CAA does not change the dimension of the parts, which makes it ideal for tight tolerance assemblies. CAA coating is also non-conductive. Aluminium parts with CAA coating are typically used for finished surfaces, as a base for painting or together with hardcoat anodizing (see below). Galvatek has delivered CAA plants for the aerospace industry.
Sulphuric Acid Anodizing (SAA) – Type 2
Sulphuric acid anodizing is the most widely used type of anodizing. The SAA process creates only moderate corrosion resistance for the surface, making it ideal for decorative applications. A wide selection of dyes is available to create different colours for the sulphuric acid film before sealing. The colour of the dyed SAA aluminium is long lasting, even in direct sunlight. SAA is often used for architectural extrusions and sheets, electronic components and devices, and other hardware. Galvatek has delivered automated SAA anodizing & coloring lines for production of extruded aluminium profiles.
Hardcoat Anodizing (HCA) – Type 3
Hardcoat anodizing is used to achieve a hard coating that is resistant to abrasion. The coating is harder than tool steel and therefore highly suitable for aluminium components subject to extreme mechanical wear or corrosive environments. The colour of the hard-coated aluminium is dark or black and it cannot be dyed. Hard coating also increases the dimensions of the treated part. Galvatek designs and delivers hard anodizing plants that are used for producing valves, pistons, gears, joints and other sliding parts.
Boric Acid Anodizing (BAA)
Boric acid anodizing (also referred to as boric sulphuric anodizing) is an environmentally friendly alternative to chromic acid anodizing. BAA creates a suitable surface for paint adhesion and corrosion prevention. BAA does not change the dimensions of the treated parts and is often used in the aerospace industry for precision parts and tight tolerance assemblies.