CHEMICAL CONVERSION
Chemical Conversion
Chemical conversion / Chromate conversion / Dichromate seal
Generally, a chemical conversion coating is a coating produced by a chemical or electrochemical treatmentic on a metallic surface. The result of those processes is the addition of a superficial layer containing a compound of the metal. This process can be used either as a stand alone finish or as a base for subsequent paint.
Benefits
Can be used as a primer for paint and has good adhesive properties for lamination. It also provides protection against corrosion and is an alternative to anodizing.
Our Techniques
What is Anodizing ?
Anodizing is an electrochemical process that converts the metal surface into an oxide finish.
At Ultraspec, we treat only aluminum even though nonferrous metals, such as magnesium and titanium, also can be anodized.
Our Process Types
Type I, Chromic Acid Anodizing (CAA)
First commercial type of anodizing, widely used in aerospace and defense. It minimises metal fatigue and is compatible with many aluminum alloys.
Type II, Sulfuric Acid Anodizing (SAA)
Most frequently used type of anodizing, this process will generate a decorative or protective surfaces with a greater durability than surfaces treated with type I.
Type III, Hardcoat Anodizing (HCA)
The primary objective of this process is to obtain a hard coating, resistant to abrasion. It is obtained using an electrolyte of sulfuric acid at low temperature with high voltage and current density.
BAC 5632 / MIL-A-8625 Boric Sulfuric Anodizing
Developed by Boeing Aerospace as a chrome free alternative to type I, for non-critical fatigue part. The adhesion to paint is equal or superior to Type I and this type of anodizing provides corrosion protection.