Non-Chrome Conversion Coatings
PowderTech offers a complete compliment
of Conversion Coatings. All Conversion Coatings are designed to improve corrosion resistance for aluminum,
magnesium, and zinc surfaces (Non-Ferrous White Metals). They can be utilized for a pre-powder coating corrosion
inhibiting film barrier or a stand alone finish.
Chromate conversion coatings are often referred to as Iridite®, Alodine® or Chem film®. It
should be noted that Iridite, Alodine, and Chem-film are trade-names for chemicals used to produce chromate
conversion coatings. Chromate conversion coatings are produced by an immersion process.
Chromate conversion coatings are a non-crystalline, amorphous coating. Chromate conversion coatings are
widely used in general metal finishing to retard corrosion, as a base for paints, and even as
a decorative finish. Hexavalent Chrome is losing favor in manufacturing circles due to
EPA application compliance and the toxicity of Cr6.
Key benefits of Conversion Coatings
- Promotes outstanding paint
adhesion on non ferrous surfaces
- Improves electrical
- Provide excellent Corrosion
Resistance on Non-Ferrous Metals
PowderTech's (Metalast TCP-HF / Cr3) provides a safe and compliant finish for most applications in today's green environment.
PowderTech employs a licensed version of the US
Navy's Trivalent Chromium
Pre treatment (TCP). This alternative to Alodine® and Iridite® provides Class 1A corrosion protection and paint
adhesion and Class 3 electrical characteristics. It has been found through accelerated corrosion
testing that results with this
new product have been outstanding. This process is MIL-C-5541F approved, non-toxic, and is quickly replacing traditional
Chromate Conversion Coating.
Qualities of this new Conversion Coating
A - 100% hexavelent-chromium free conversion coating for aluminum,
magnesium, and zinc alloys - RoHS, WEEE, ELV compliant finish
B - Harder and more abrasion resistant finish than the traditional
C - Outstanding corrosion resistance - meets salt spray requirements
(ASTM B 117) for MIL-C-5541, MIL-DTL-81706 and AMS 2473
D - Outperforms conventional chromate coatings in corrosion resistance
testing on copper bearing aluminum alloys 2024 and 2019
E - Will not degrade at temperatures above 140°F making it a great
replacement for parts receiving powder coat.
F - Provides a finish that is a blue-bright look
All conversion coatings are produced by way of an immersion process. They can be used as a stand
alone finish but this is not recommended for parts that will see any type of abrasion. The coating is typically
soft in nature and not conducive to a final finish.