Hardcoat anodize, commonly referred to as Type III anodizing, is formed by using an electrolytic solution of sulfuric acid at approximately 32¢X F and a current density of 23 to 37 Amps per square foot. The process will run for 20 to 120 minutes depending on the alloy used and desired coating thickness. This will produce a generally gray coating 10£gm to 50£gm thick with 50% buildup and 50% penetration.

Properties & Advantages

Hardcoat anodizing provides for several desirable qualities such as:

• Corrosion Resistance (500+ Hours salt spray resistance per ASTM B117)
• High Durability (file hard,Taber Abraser CS-17 1000 g) better than hard chromium or steel
• Electrical Insulation (20 degree C,4*10.15 ohm cm2 / cm) as a good insulation.
• High temperature Resistance (untile 2050 degree C)
• Breakdown Voltage Resistance (over 1500 DC)
  
• Low rub coefficient (0.095)
  
  Hardcoat anodize coatings may be dyed a variety of colors. However, due to its naturally darker appearance, dyeing does not produce the vibrant colors that a Type II sulfuric anodize will. Additionally, the required sealing process after dyeing does slightly reduce hardness.

• There are hundreds of governmental, industrial, and commercial anodizing specifications in use, each with their own method of calling out coatings, seals, dyes, etc. Any anodizer should recognize the Type III designation to indicate a hardcoat anodize, Class 1 to specify natural color or no dye, and Class 2 to indicate a dye.

• Hardcoat anodizing works very well with 2000(2014),3000,5000, 6000, 7000 series aluminum alloys and 214,355,356 series die casting material.

• Altec's Hardcoat Anodizing have strictly quality control and achieve MIL-A-8625E TYPE3 ,AMS 2469C and B.S.5599 standardization.