Plating and

anodizing

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The anodizing process

Aluminum anodizing is the electrochemical process by which aluminum is converted into aluminum oxide on the surface of a part. This coating is desirable in specific applications due to the following properties:
  1. Increased Corrosion Resistance
  2. Increased Durability / Wear Resistance
  3. Ability To Be Colored Through Dying
  4. Electrical Insulation
  5. Excellent Base Or Primer For Secondary Coatings

Types of anodizing

Over the last several decades a variety of anodizing processes have been developed. However, there have been three main variations of aluminum anodizing: chromic anodizing, sulfuric anodizing, and hardcoat anodizing. Each of these has advantages and disadvantages depending on the application.

CHROMIC ANODIZING
Utilizing a chromic acid electrolyte this form of anodizing yields the thinnest coatings, only .05 to .1 mils thick. Chromic anodizing is a good choice when a part is complex and difficult to rinse because chromic acid is less corrosive than sulfuric acid used in other anodizing methods. Chromic anodize also reduces the fatigue strength of the aluminum less than the other methods described.

SULFURIC ANODIZING
This form of anodizing yields coatings under 1 mil thick. Although it offers mild abrasion resistance it is more durable than chromic anodize. Like most anodizes corrosion resistance is excellent. The most desirable feature of this form of anodizing would be the excellent results from dyeing yielding deep and rich colors.

HARDCOAT ANODIZING
Also using a sulfuric acid electrolyte, although at a lower temperature, hardcoat anodize's claim to fame is wear resistance. This will produce a Rockwell C-scale rating of 60-70. This makes it an excellent candidate for many wear situations.

CHEM FIlm

Description coming soon!

Plating

Cadmium
Cadmium plating is a plating process that is used extensively in the aerospace industry due to its corrosion resistance in extreme and harsh environments including salt atmospheres.  Cadmium plating offers a diverse set of benefits that include strength, malleability, and softness concurrently.  It serves as an excellent base for prime and paint. 

Zinc
Zinc plating is a plating process that prevents the oxidation of material by providing a zinc coating that acts as barrier and does not interact with oxygen.  As a result, zinc plating is often the best plating solution for parts that can withstand no oxidation or rust.  

Zinc Nickel
Zinc-Nickel is an acid coating that is used in the protection of steel, cast iron, malleable iron, copper, and brass. Zinc-Nickel is recognized as an environmentally safe alternative to cadmium. Zinc-Nickel is normally applied for corrosion protection purposes. 

Nickel
Nickel Plating has exceptional deposit uniformity, lubricity and hardness for optimal part performance. The process is ideal for plating high-strength steels, mild steels, stainless, aluminum and others. 

Electroless Nickel
Electroless nickel plating is an auto-catalytic chemical technique used to deposit a layer of a nickel alloy on a metal surface whose main purpose is to prevent corrosion and wear. 

Passivation
Passivation is a chemical process whereby debris and trace metallic elements from the machining process are removed from the surface of stainless steel, improving the inherent corrosion resistance of the material. The passivation process insures that the naturally occurring, protective oxide film is continuous on the stainless surface.