Anodising Technical Information


The Anodising Process

Anodising is an electrolytic surface treatment process, where the part is made anodic in an acid solution. This process doesn’t just create an attractive finish, it converts the base metal to form a protective oxide coating over the exterior of the anodised part.

  • First, the part is chemically cleaned to remove surface contamination
  • The part is racked on specially coated racks (aluminium or titanium) designed to conduct an electric current
  • The part is dipped in an acid solution with an electric current running through it. The part serves as an anode (a positive charge).
  • The current releases hydrogen at the source of the negative charge and oxygen at the anode, creating a buildup of aluminium oxide on the surface of the part
  • The oxide coating grows into and out of the product, converting the surface of the material itself into a protective coating
  • The anodised part is treated in chemical baths to seal the microscopic pores created by the process

Please note: components to be anodised must be free from any inserts, screws, bolts or any other items. If these parts remain and are not made from aluminium, they will be attacked by the acids used during the process and may be damaged.

Anodising Surface Finishes

Standard Anodising

Standard anodising takes on the characteristic 'frosted silver' effect seen on many anodised consumer products today. It creates a matt finish and can also be dyed or electrolytically coloured.

Bright Anodising

Bright anodising involves 'brightening up' the anodised aluminium before anodising by dipping it in our special 'bright dip' chemicals which polish it, giving it a mirror finish.

Duplex Coatings

DECO has a unique capability of developing and applying multiple coatings to components to provide custom finishing solutions. By combining processes including anodising, hard anodising, e-coating, powder coating and our specialty coating processes, we can meet the unique requirements of your project.

An example of this is DECO's Nucotec ™ Plus Process. DECO developed a unique coating system combining extra-hard anodising with controlled e-coating deposition, impregnated with stainless steel flakes, to be applied to low pressure cast aluminium blocks for the new Tai Kwun arts precinct in Hong Kong. This unique coating met the project brief of a highly durable coating with a metallic appearance, suitable for a contemporary building facade.

Certifications & Accreditations

MIL SPEC Anodising

MIL SPEC is a US military standard to ensure products meet certain requirements for defence-related objectives. It is also a standard used by other non-defence organisations such as government, industry and technical organisations.

DECO standard and hard coat anodising have been tested to meet quality standard MIL-A-8625F, type 2 (sulfuric acid anodising) and type 3 (hard coat anodising). We ensure all our anodised aluminium passes the dye-spot test and corrosion resistance test, and meets requirements for coating weight, coating thickness and abrasion resistance.

Quality Testing, Standards and Compliance

AS/NZS ISO 9001:2015

DECO Industrial is certified compliant with AS/NZS ISO 9001:2015 for provision of metal finishing services including Powder Coating, Anodising, Hard Anodising, Electroplating, E-Coating, Chromate Conversions, Slurry Peening and Mechanical Finishing.
This certification ensures products meet stakeholder needs while meeting statutory and regulatory requirements.

ISO 14001 Environmental Management Certification

DECO is currently undergoing the certification process to attain ISO 14001 Environmental Management System Certification. This certification ensures organisations minimise the negative environmental impacts from their processes, and that their processes comply with relevant environmental laws and regulations.

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