Anodisation Process
As an OEM/custom machined metal parts manufacturer, Unison Tek is not just experienced in the turning and milling process, but also have had affiliated companies who can take care of different surface treatments for us – anodisation.
For example, it is a process that’s being heavily used on our machined parts.
What is anodisation?
Anodizing is an electrolyticpassivation process used to increase the thickness of the natural oxidelayer on the surface of metal parts.
The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell. Anodizing increases resistance to corrosion and wear, and provides better adhesion for paint primers and glues than bare metal does.
Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light.
Types of anodising
1) Chromic Acid Anodising
Rarely used, but suitable for castings and in situations where a reduction in fatigue strength is not acceptable. Film thicknesses are the thinnest of the three common processes. However, it’s not ideal for when coloring is needed.
2) Sulphuric Acid Anodising
Used in a variety of occations. A range of oxide layer thicknesses can be achieved as can effective colouring, most commonly achieved by the application of a secondary colouring treatment. Film thicknesses in aluminium are in the range of 5-25 Microns, with 10-15 required for effective colouring using dyes. Coating thicknesses in titanium are significantly less, being in the range of 0.1-0.3Microns.
3) Hard Anodising
Hard Anodising is ultimately is the thickest form of anodising, creating an oxide layer which is between 20-100 Microns thick, depending on the base alloy being treated.
It offers the highest increases in hardness, wear resistance and electrical resistance and is primarily a functional coating. It is also performed in a sulfuric acid solution, but with higher acid concentration, low temperature and a higher voltage applied.
Case Study: Issues we ran into when anodizing:
-Fixation for anodisation/ jigging marks: It’s prone to corrosion and bruises.
-Blind holes: Electrolyte will not able to get into the blind holes, thus creating uneven appearances.
-Insufficient packaging/ impact while shipping the goods is likely to create marks.
Preventative measures:
- -Reinforce inspection equipment: anodisation thickness testers, durometers, salt spray test machine
- -Tapes applied to mask the area while anodising
- -Reinfoce packaging sufficiency
Benefits of Anodizing
- Corrosion resistance: Protects the metal from moisture and chemicals.
- Wear resistance: Increases surface hardness.
- Aesthetic finish: Allows for a matte or colored appearance.
- Environmentally friendly: No heavy metals or toxic by-products.
- Stable surface: Will not peel or chip like paint or plating.
Common Applications
- Consumer electronics (e.g., smartphone casings)
- Architectural components (e.g., window frames)
- Automotive and aerospace parts
- Kitchenware and sports equipment
CNC ISO 9001:2015 Certified Machine Manufacturer in Taiwan for OEM/ODM/Customized machined products for 36 years in Taiwan.
Please visit our pages: CNC Turning Parts, Machined Parts, Stamping Parts, CNC Mahining Service, Technical Data and Quality Inspection to get more information about us.
Please get a free quote from Harry Yen hyen@unisontek.com.tw. All of us are looking forward to your comming and invite you to visit our cnc machining factory in Taipei, Taiwan. Our team will reply to you with engineering feedback in two working days.
Please watch our company channel on YouTube and introduction https://www.youtube.com/watch?v=zkOWcfXdx5s
Unison Tek has been growing a scalable company in Taipei Taiwan, and our goal is to serve all the people clients who need oem machined metal parts that made in Taiwan.
Whether you need more information, samples, a quote, or advice for a project, we would be delighted to serve you anytime, our production line is ready to make any parts for you.