Benefits of Chromic Acid Anodizing on Metals

Chromic acid anodizing extensively known as type I anodize produces the thinnest anodic film in the midst of all three major anodizing types with a coating range from 0.00005” to 0.0002”. Nonetheless, once this thinnest coat is properly sealed, it enjoys the ability to afford equal corrosion protection equivalent to the thicker Type II and Type III or hardcoat group of anodizing. With a less acidic nature opposed to type II, chromic acid anodizing is top preferred in critical components and applications as a safer solution to boast higher integrity when applied to places like delicate closures or welded ridges.

How Chromic Acid Anodize Differs from Its Counterparts?

The thinner layer of chromic anodize appears grayer in color, and due to natural thinness, it is less likely to absorb many colors when dyed. Even though with least dying possibility, it’s not chosen when it comes to decorative finishes. Nevertheless, it can be effectively dyed black for using as a non-reflective coating of structural parts widely demanding in structural industry, housing, and optical applications. Equally, it’s to be noted that black dyed chromic is not as blackish as produced from sulfuric anodizing while it looks light grayer in appearance. Importantly, to let chromic anodize accept black dye, the setting temperature of chromic acid needs to get raised and needs scheduling accordingly. It is less porous and softer than type II and Type III and ideally preferred in aerospace, precision machining, and constructional industry.

Benefits of Chromic Acid Anodize

Excellent for parts of tight tolerance

One of the unique attributes of chromic acid anodizing is that once applies; it won’t change dimensions of structural parts of high tolerance. The coatings have negligible or no impact over the fatigue force of finished metal parts that are relatively thin, fragile or complex. This makes it much preferred to plating specialist groups for anodizing components with holes, gaps, alcoves, and crevices to have superior integrity in finishing.


A chromic acid anodizing boasts an appearance which varies among opaque shiny to dark grayer depending on the kind of alloy used in the application. With a thinner coat, it offers the higher possibility of corrosion resistance as well as an exclusive base for painting.

Good for Bonding: With thin layers, chromic acid anodizing performs great for bonding needs;

Non-Conductive: with skinny film, chromic acid anodizing has high demand in aerospace to electrical and electronic due to non-conductive.

Excellent for welded and assembly parts: When it comes to critical applications having joined, welded parts and assembled or bonded structural materials, type I or chromic acid anodizing works many betters as opposed to others.

Chromic Acid Anodize – Major application areas

• Aerospace applications

• Precision machined elements

• Welded parts and assemblies

• Prime or paint base

• Structural finishes