Anodizing: Type II (Sulfuric) and Type III (Hardcoat)
Sulfuric Anodize: Type II
Type II, often referred to as "regular", "architectural", or "sulfuric" anodizing, is performed in a conventional 10-20% concentration sulfuric acid bath at room temperature (70 degrees F) for 10-70 minutes to produce the desired finish. Type II finishes are used for decorative or aesthetic purposes while providing some surface protection. These finishes may also be used as a protective base for other coatings such as paint. In addition, these finishes may be dyed to achieve various colors.
- Finish is produced on various alloys and castings of aluminum. Material may be processed clear, organic dyed (solid or multi-colored), and masked to prevent coating buildup (allows conductive surfaces to remain).
- Typical coating thickness ranges from 0.30 - 1.0 mil.
- Type II is often referred to as "soft or decorative anodize" and is used in industries from automotive, medical, aftermarket commercial and aerospace.
- Corrosion Resistance
- Increased Emissivity
- Decorative Colors
Sulfuric Hard Anodize: Type III
Type III (hardcoat) anodizing is generally used when a more structurally durable finish is desired including improved hardness, abrasion resistance, and corrosion resistance. Hardcoating is performed in a sulfuric acid bath at somewhat higher acid concentrations, at lower temperature (32 degrees F). The resulting surface is very hard and corrosion and abrasion resistant, with wear qualities superior to case-hardened steel and hard chrome plate. Type III anodizing is commonly used in industrial products and other applications where superior hardness and wear surfaces are important. Hardcoat anodizing is commonly used for engine pistons, hydraulic parts, and cookware, to name a few.
The finish is produced on various alloys (1000 to 7000 series) and castings of aluminum. Material may be processed clear or organic dyed, usually black. Masking may be applied to prevent coating buildup in defined areas that allows conductive surfaces to remain. Capability of producing up to 4 mil coatings. Typical coating thickness ranges from 0.5 mil to 2 mil, salvage operations may reach 0.0050 or more depending on aluminum alloys used. This coating is referred to as "hard anodize" and is used predominately for applications requiring increased abrasion wear, corrosion resistance, and electrical resistance.
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