The chemical process called Bright Dip anodizing is used to achieve a shiny, almost mirror finish similar to mechanical polishing. The method is used on aluminum to not only improve aesthetics but to also lengthen the lifespan of the treated aluminum part.
Because Bright Dip Anodizing comes in a wide range of colors, it’s typically used to cosmetically enhance products such as automotive parts and machine parts, extrusions, appliances, architectural trim, light reflectors, and window frames. Recreational and sporting goods such as flashlights, baseball bats, and paintball guns are also goods that are enhanced by the Bright Dip process.
The Bright Dipping and Anodizing Processes
Bright Dip Anodizing involves two continuous processes; bright dipping is the electro-brightening treatment that gives aluminum a glossy, high luster appearance while anodizing is the process that adds additional protection from scratching, fading and most importantly, corrosion.
Bright Dipping involves a solution of phosphoric and nitric acid which smoothens microscopic roughness, changing the texture of the surface. Often, additives are introduced to the blend to enhance its brightening ability and reduce nitrogen oxide fumes. Because it smooths out the tiniest irregularities on the surface and leveling the tiniest peaks and valleys, the aluminum comes out with an enhanced, highly reflective sheen.
Anodizing involves immersing the aluminum in an acid electrolyte bath with a cathode; a protective oxide layer forms on the surface of the part being treated by passing an electrical current through the bath. Because of the added oxide layer, anodized aluminum has longer lifespans than untreated or non-anodized aluminum.
The following is a brief background on Bright Dip anodizing:
Standard Specifications
MIL-A-8625 Type II (Class 1 & 2)
RoHS, REACH, ELV & WEEE Compliant
Performance Benefits
Improved Aesthetic
Appeal Ability to Finish Complex Part Shapes
Receptive Metals
Aluminum Alloy
The degree of brightness depends on the type of alloy as well as the part’s surface finish. The harder tempered alloys produce higher lusters. The following aluminum alloys are most suitable for bright dipping:
- 5357
- 5457
- 5557
- 6063
- 6463
- 7016
- 7029
Thickness
.0001-.0007”
100-700 uin.
Max Part Size
152” x 52” x 28”
While many shops offer anodizing services, not all have Bright Dip provisions because of the complex processes involved. The phosphoric-nitric acid solution must be operated at a specific temperature and contained in a double-walled tank in a well-ventilated room. Both Bright Dipping and anodizing processes also require a certain amount of skill; otherwise, the brightening results are poor.
Do you have Bright Dip Anodizing service needs? At Aerospace Metals, we strive to be the one-stop source for all metal finishing needs. We have developed an extensive network of Metal Fabrication, CNC Machining, Extrusion, Stamping & Metal Finishing Companies throughout North and South America. The companies we work with all maintain a minimum Quality Management System of ISO 9001:2008.
We only use the verified best supplier for any given process. We know exactly where to find inefficiencies in the outsourcing chain. It significantly decreases the amount of rework, lost parts and excuses you may be dealing with today.We offer a comprehensive review of your entire outsourcing platform. If you have questions about Bright Dipping or concerns about how your aluminum alloy parts are processed, call us today at 800.398.0790 or email us at info@aerospacemetalsllc.com.
