SERVICES

Anodizing Type II, Class 1 (Un-Dyed) & Class 2 (Dyed)

Sulfuric acid anodizing
In general, anodizing refers to conversion coating of the surface of aluminium and its alloys to porous aluminium oxide. The process derives its name from the fact that the aluminium part to be coated becomes the anode in an electrolytic cell. 
This differentiates it from electroplating, in which the part is made the cathode. Whereas anodizing is typically associated with aluminium, similar processes are used for other base metals, including magnesium, titanium and zinc. 
On most aluminium alloys, the sulfuric acid anodic coating is colourless and transparent. Alloys containing high manganese and silicon levels tend to give greyish or brownish coloured coatings. The transparency of the coating decreases with increasing coating thickness.

(HARD COAT) Hard Anodizing Type III, Class 1 (Un-Dyed) & Class 2 (Dyed) 

The primary differences between the sulfuric acid and hard anodizing processes are the operating temperature, the use of additional agents, and the voltage and current density at which anodizing is accomplished. Hard anodizing, also referred to as hard coat or type III anodizing, produces a considerably heavier coating then conventional sulfuric acid anodizing in a given length of time. 
Typical operating temperatures of the bath range from 0°C to 10°C current density ranges between 2 and 3.6 a/dm². However, some hard anodizing processes operated at high temperature may result in the formation of soft and more porous outer layers of the anodic coating. This change in coating characteristics reduces wear resistance significantly and tends to limit coating thickness.

Chemical Conversion Coatings Type II

Also known as Chem Film, Irridite, Alodine, Chem Treat.
Chemical conversion coatings are intended to prevent corrosion, improve adhesion of paint finish or other coatings, and for improved electrical and electronic applications where low resistance contacts are required.


  • PIC 5
  • PIC 6
  • Product Sample 5

FAQ


1. What substrates or base metals can be anodized? 

The three substrates that can be anodized are aluminium, titanium, and magnesium. Steel or stainless steel cannot be anodized.

2. Is there a price difference between conventional and hard anodize? 

Hard anodize is more expensive due to increased energy requirements associated with the process. Ending cost differences are dependent upon many variables in a given order. For example: part size, racking instructions, packaging, etc. 

3. What colors are available for anodize? 

Please refer to IONPLUS representative.

4. What alloys are best for anodizing? 

In general, wrought alloy series 1000-7000 provide the best corrosion and aesthetic properties than cast alloy. Specific alloy choice to match performance needs should be discussed on a case-by-case basis.

5. What is the difference between Type II “conventional anodize” and Type III “hard anodize”? 

Type III or hard anodize offers a more dense aluminium oxide layer. To produce this requires increased electricity consumption and a super cooled electrolyte bath. Perhaps the best way to illustrate differences between type II “conventional anodize” and type III “hard anodize” is in the following chart. Notice the enhanced attributes of hard anodize versus conventional anodize.


6. How much substrate material is removed during the etch process? (Acid & Alkaline) 

The amount of substrate material removed during the etch process will affect part dimensions. The exact amount is alloy dependent and must be determined on a case-by-case basis.

7. Can anodize be welded or soldered? 

Parts can be welded prior to anodizing. The use of 5356 welded rod is strongly recommended, though some discoloration will still occur. 4043 is the worst choice because it will turn a smutty black when anodized. If welding is necessary after the anodize process, the coating on the portion to be welded must be removed.

8. Will anodize affect the adhesion of paint or subsequent coatings? 

Anodize will promote the adhesion of paint and subsequent coatings.

9. Will anodizing hide scratches? 

Anodizing will provide minimal cover-up for surface scratches because anodize mimics original substrate finish. To further enhance anodize appearance consider aggressive etching, hand polishing, or surface blasting.

10. Is anodizing environmentally friendly? 

Yes, anodize does not entail the use of heavy metals nor does it produce toxic waste. Anodize meets the environmental and safety directives of the FDA, USDA, ELV, WEEE and RoHS.