Overview

METALAST TCP-HF EPA (Extended Protection Additive) is a “non-chromium” chromate conversion coating product to be used in conjunction with METALAST TCP-HF, as an anti-corrosion and paint adhesion to metal agent. This chromate conversion coating chemical additive helps in achieving military conversion coating specifications, aerospace, automotive and other industry’s corrosion standards such as MIL-DTL-81706B, MIL-DTL-5541 and ASTM D3359 paint adhesion. METALAST TCP-HF EPA excels in chromate conversion coating applications where process control is limited and/or facility constraints prohibit the use of optimal pretreatment practice especially in situations where paint adhesion to metal or meeting conversion coating specifications is critical.

Background

Historically, one of the more difficult aspects of using a trivalent chromate conversion coating, as a “drop-in” replacement for hexavalent chromate conversion coatings, is the requirement of rigid pre-treatment chemistry operating parameters, which will produce maximum anti-corrosive and paint adhesive benefits, ultimately leading to the passing of many different industry specifications, including military conversion coating specifications, MIL-DTL-81706B, MIL-DTL-5541 and ASTM D3359. Metal finishing processors and manufacturers spend months if not years trying to optimize their chromate conversion coating processing parameters and product specifications that will allow for consistent results that pass salt spray requirements, paint adhesion to metal, military conversion coating specifications and other corrosion specifications. The nature of trivalent chromate conversion coating technology poses the burden of tailoring the facility’s resources and equipment constraints to the product, which requires a slightly more sophisticated level of understanding than most processing facilities can afford to undertake. For this reason, METALAST began down the path to produce a chromate conversion coating additive that would work in conjunction with METALAST TCP-HF while providing a more generic and robust solution. METALAST TCP-HF EPA, now available to the market, provides superior anti-corrosive and paint adhesive properties, while meeting key military conversion coating and industry specifications such as MIL-DTL-81706B, MIL-DTL-5541 and ASTM D3359 paint adhesion.

General Performance

METALAST TCP-HF EPA can be added to an existing METALAST TCP-HF bath without affecting the color, paint adhesion to metal, or electrical resistance properties that METALAST TCP-HF alone provides. In addition, bath longevity and the chemical analysis of METALAST TCP-HF is not affected when METALAST TCP-HF EPA is added. When used in conjunction with METALAST TCP-HF, METALAST TCP-HF EPA will easily meet the requirements of the following specifications:

• MIL-DTL-5541
• MIL-DTL-81706B
• ASTM D3359 paint adhesion

Applications

METALAST TCP-HF EPA chromate conversion coating additive is specifically designed for aluminum wrought alloys but can also work on the following substrates for anti-corrosion enhancement:

• Bare aluminum
• Anodized aluminum
• Zinc and zinc alloys
• IVD
• Cadmium
• Silver
• Brass
• Stainless Steel
• Iron Alloys
• Magnesium
• Zirconium

Testing

Industry leaders that have tested METALAST TCP-HF EPA chromate conversion chemical additive include:

• Raytheon
• Lockheed Martin
• UTC
• Boeing
• Leggett & Platt

Approvals

METALAST TCP-HF EPA easily meets or exceeds all major military conversion coating specifications and industry directives and including:

• MIL-DTL-81706B
• MIL-DTL-5541
• ASTM D3359 paint adhesion
• QPL (Qualified Products List)- METALAST TCP-HF EPA is QPL listed
• RoHS (Restriction of Hazardous Substance Directive)
• ELV (End of Life Vehicle Directive)
• WEEE (Waste Electrical and Electronic Equipment Directive)
• OSHA Hexavalent Chrmoium PEL (Permissible Exposure Limit)
• EO 13148 (Executive Order)

Additional Information

Additional information on METALAST TCP-HF EPA chromate conversion coating additive can be downloaded from the METALAST documents library. You may also contact the METALAST Technical Center, Sales Support Staff at:

• 1-888-782-8324

or by emailing:

• TCPHFinfo@metalast.com

Ordering

You may purchase METALAST TCP-HF by calling:

• 1-888-782-8324

or by emailing:

• TCPHFbuy@metalast.com

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