Services Industries Successes FAQ News & Events Quote Site Map
Related Anodizing Topics
What is Anodizing?
Is Anodizing Safe?
Aluminum or Stainless Steel?
Anodized Aluminum Applications
Aluminum Anodizing Process
Prepare: Anodize Aluminum Parts
Finish Performance Comparison
Hardcoat Anodizing
Hard Coating Things to Consider
SMT Quality Control Manual (PDF
opens in new window)


Recent News

Dec. 2005 - Superior Metal Technologies Launches New, Expanded Website 

Home  >>  Services  >>  Hard Coating

Modified Hard Coating

Hard Coating: Hardcoat Anodizing, Anodic Oxide Coating, Rockwell C-Scale Rating of 60 - 70, Corrosion / Electrical / Temperature Resistance, Low Friction Coefficient


Modified hard coating, (also known as hard coat anodizing or hard anodizing) is an electrochemical process that applies a corrosion resistant coating, chemically bonded to the surfaces of aluminum and aluminum alloy parts or pieces. This creates a surface coating with hardness characteristics second only to diamonds.

These are just a few of the industries that have benefited from the use of hard coated aluminum components for thousands of applications:

Hard Coating: Functions and Uses

Hard coating is ideally suited for many product applications. Our state-of-the-art high capacity production facilities can hard coat a wide variety of components, in sizes up to 32-feet long. Various techniques can be employed to enhance the corrosion resistance or abrasion resistance of the treated surface.

Click for larger image

Electrolytic Coloring
 Click for larger image

Hard coatings offers a wide range of color options:

  • Various bronzes
  • Black
  • Many shades of gray
  • Clear.

For more details about the 1000's of uses and applications of aluminum products with anodic coatings, read: Anodized Aluminum Applications.

Modified hard coating provides lubrication properties that resist abrasion and corrosion, making it the ideal solution for:

  • Pistons
  • Cylinders
  • Cams
  • Gears
  • Swivel Joints
  • Hydraulic / Pneumatic Components
  • Applications where metal parts touch or rub each other

Hard coating can be applied to a wide range of aluminum and aluminum alloy components:

  • Large Sized Parts – up to
    33' 6"L X 5'H X 30" 
  • Specialized tooling for modified hardcoating throws coating in long lineal lengths, down tubing with internal bores as small as 7/8", for pneumatic cylinders, hydraulic cylinders, etc.
  • Wire Coils
  • Gears, wheels, pulleys, etc
  • Extrusions
  • Fabricated Extrusion
  • Break Metal
  • Panels
  • Piece Parts

Modified Hard Coating: Features & Benefits of Hardcoat Anodizing

Beneficial properties of hard coatings include:

  • Corrosion Resistance
  • Variable Thickness – smaller tolerances than previously available
  • Hardness – Rockwell scale rating of C - 60 / 70
  • Wear Resistance
  • Resistance to chemicals, solvents and petroleum based products
  • Electrical Resistance
  • Temperature Resistance
  • Low Friction Coefficient after Lubrication

Hard Coating: Things to Consider

There are a number of points to consider when planning to hardcoat aluminum parts. Modified hard coatings are not always the best option for every application.

For more information, read Hardcoat Anodizing: Things to Consider.



View color guides from Akzo Nobel, PPG and Valspar

Color Guides


click photo to learn more

Click for Case Study: Denver Int'l Airport
Denver, Colorado

Click for Case Study: New Orleans Superdome
New Orleans, Louisiana

Click for Case Study: Hong Kong Bank
Hong Kong

Click for Case Study: Notre Dame Stadium
South Bend, Indiana

Click for Case Study: Defense Intelligence Agency
Washington, D.C.


Home   About Us   Contact Us   Services   Industries   Successes   FAQ   News & Events   Quote   Site Map