Aluminum Finishing


  • Color will vary from light tan to black depending on alloy and thickness.
  • Coating PENETRATES base metal as much as builds up on the surface.
  • The term THICKNESS Includes both the buildup and penetration.
  • Provides very hard ceramic type coating.
  • Abrasion resistance will vary with alloy and thickness of coating.
  • Good dielectric properties.
  • Corrosion resistance is good, but recommend seal hard anodize In 5% dichromate solution where increased corrosion resistance is required. Where extreme abrasion resistance is required do not seal as some softening is encountered.

Advantages of an Aluminum Hard Anodized surface:

  • Corrosion resistance
  • High dielectric strength
  • Non-contaminating
  • Abrasion resistance
  • Durability


  • Color will vary with alloy.
  • Aluminum with low alloying elements will show practically no color change.
  • Best coating on aluminum for dyeing.
  • Can be dyed practically any color or shade (Black, blue, red, etc.).
  • Salt spray requirement is 336 hours 5% solution per method 811 of FED-STD-No. 151.
  • Minimum weight for Type 11 coatings: Class 1 600 Milligrams/sq. it, Class 2 2500 Milligrams/sq. ft.

Advantages of an Aluminum Anodized surface:

  • Corrosion resistance
  • Dimensional control
  • Clean surface
  • Non-conductive surface
  • Durability
  • Color stability
  • Aesthetics


  • Materials qualified produce coatings that range in color from clear to iridescent yellow or brown.
  • For maximum protection against corrosion, for surfaces to be painted or left unpainted.
  • Class 3 chemical coatings are intended as a corrosion preventive film for electrical and electronic applications.