T & T Anodizing / Industrial Spray Finishing Inc.

"Precision Finishing For Precision Machinists"

35 Maple St.   Lowell, MA 01852
Phone: 978-454-9631    Fax: 978-937-0383
E-mail: info@ttanodizing.com

 

Type III PRECISION SULFURIC ACID ANODIZING

AKA  "Hardcoat, Hard Anodize"

This Finish is RoHS Compliant

( Per Mil-A-8625 Type III Class 1 & Class 2)

Hardcoat Anodizing is an electrochemical process that forms a non-conductive oxide coating on the surface.  The coating will penetrate the surface of the aluminum up to 50 % of the overall thickness. When aluminum alloys are hard anodized an oxide coating is formed that grows from the base metal and leaves a very hard corrosion resistant coating with excellent wear properties.  The presence of pores in the oxide coating allows the surface to be colored by using organic dyes and then sealed to enhance its corrosion resistance.  The color of the coating is designated by the Class.

Keep in mind, that due to the dark mauve to grayish color, (depending upon the alloy), of the natural hardcoat,  many colors, other than black, will not be cosmetically effective.

                                   A Class 1 finish is the natural color of the oxide coating

                                   A Class 2 finish is usually dyed black.

Our strict quality control measures will ensure that your parts will be consistent in color from one order to the next.

* When color matching is important we highly recommend using the same alloy on all parts.

The oxide coating from sulfuric acid hard anodizing of this Type III is controlled to a total thickness in the range .0005" to .0025" or .5 to 2.5 mils.

MIL-A-8625: Anodic Coatings for Aluminum and Aluminum Alloys

 TYPE III - CONVENTIONAL SULFURIC ACID ANODIZING

Class 1 - Non-dyed coatings   Class 2 - Dyed Coatings

MIL-A-63576: Aluminum Oxide Coatings, Lubricative, for Aluminum and Aluminum Alloys

Type I - Anodic coating impregnated with PTF

CLICK HERE to see a picture of our Anodizing and Hardcoat tanks.

CLICK HERE to download Mil-8625F Specification in PDF Format

© Copyright 2009 T & T Anodizing Inc., Inc