Chromate Conversion
When aluminum and aluminum alloys are immersed in a controlled chromic acid bath with special additives, a chemical conversion reaction occurs at the metal’s surface. This reaction produces a complex, non-crystalline, non-porous coating consisting of a thin aluminum oxide film with entrapped chromates and dichromates. The coating’s corrosion resistant properties are due primarily to the chromates, specifically the hexavalent chromium.
Dav-Tech Plating’s chromating baths have been formulated to achieve the optimum coating performance for a chromate finish.
Dav-Tech Chromate Properties
| Reference Specifications |
|
| Compliance |
|
Benefits of Dav-Tech Chromating
Dav-Tech Plating’s chromating services offer several benefits:
Low-cost option for corrosion and wear protection
A bonding agent for paint and adhesives
A lubrication carrier
Final finish
Minimal electrical resistance
No effect on critical dimensions, in most cases
Typical Applications and Planning
Dav-Tech chromate is typically used for:
- Aluminum frames and weldments for the computer and defense industries. Our chromating technology deals effectively with poor drainage and entrapped chemicals, a complex problem common to frames manufacturerd of welded tubing and pipe.
- Aluminum extrusions, tubing and structural assemblies. These can be chromated in lengths of 16 to 20 feet and cross sections of 4 to 5 feet.
- Any aluminum part that requires painting for corrosion resistance.
RoHS Compliant Chem Film
Dav-Tech offers you the option of using a chem film instead of our chromate film. The chem film meets the following directives:
- RoHS
• WEEE
• MIL-C-5541, with all the same benefits as our conventional chromate conversion coating
The environmentally friendly coating contains no hexavelent chrome.
