Purchase order should include as much of the following as possible:
- Basis metal to be anodized
- Special features, geometry or processing present on parts that require special attention by the anodizing processor
- Periodic testing frequency and sample quantity
- Whether approval is based on approval of process/control factors or sample part
- Quantity of pieces to be plated
- Permissible electrical contact locations
This specification establishes the engineering requirements for producing an anodic coating on titanium and titanium alloys and the properties of the coating.
These coatings have been used typically as a lubricating and anti-galling coating for elevated temperature forming, as an isolating film for increased resistance to galvanic corrosion, to provide improved wear resistance and as a pretreatment for the application of solid film lubricants, but usage is not limited to such applications.
Coatings are classified by end-product applications, as follows:
Type 1 As a coating for elevated-temperature forming.
Type 2 As an anti-galling coating without additional lubrication or as a pretreatment for improving adherence of film lubricants and in application where increased resistance to galvanic corrosion is required.
Type 2 shall be furnished unless Type 1 is specified.
Anodizing shall produce a dimensional increase of 0.0002 to 0.0004 inch (5 to 10 µm) per surface, determined by measuring the same location on parts or specimens before and after anodizing using a micrometer accurate to 0.0001 inch (2.5 µm), by eddy current measurements in accordance with ASTM B244, or other method acceptable to purchaser. If specimens are used, they shall be fabricated from the same alloy and condition as the parts and shall be processed with the parts represented.
Shall be such that there is no measurable dimensional change when measured with a micrometer accurate to 0.0001 inch (2.5 µm).