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Specialty Chemicals for Chromate Conversion / QPD-81706B Approved Chemistries

CHEMEON TCP-HF
CHEMEON TCP-HF* (Hex Free)
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It is an environmentally safe and superior trivalent chromate alternative to hexavalent chromates. The Department of Defense and the United States Navy initially developed and tested this product for use in extreme applications. Surpassing over 15,000 test panels CHEMEON TCP-HF (Hex Free) outperforms existing trivalent and hexavalent alternatives in wear and corrosion resistance (without requiring additional topcoats), while being more economical in cost per application. TCP-HF can be applied in bulk and barrel applications, without damaging the coating integrity, and is versatile enough to be applied over a wide range of materials, including zinc and alloy plating, raw zinc die cast, and aluminum.
 

As an anodize seal it is an economical alternative to chromic acid, nickel acetate, nickel fluoride, and hot water seals. CHEMEON TCP-HF is used at room temperature, at low concentrations and with short immersion times. From a cost perspective, just the energy cost to heat conventional seals (even water) is twice the cost TCP-HF material consumed. TCP-HF works with immersion times of 2-5 minutes compared to 20-30 minute times for conventional seals. Thus, less seal tank capacity is required to process parts. Further, TCP-HF has the ability to meet the requirements of all current seal processes meaning that different seal tanks do not have to be used to meet various needs. Finally, it provides equivalent or enhanced performance when compared with any other seal including 3000 hours plus salt spray results, excellent surface bonding capabilities, superb weld ability, all with no visual deterioration to the anodize surface.
   

Related products include:

 
CHEMEON TCP-HF EPA* 
(Hex Free)
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Extended Protection Additive, it is used as an anti-corrosion and paint adhesion enhancement agent in chromate conversion applications. Product properties:
  • developed for enhanced performance for 2000 and 7000 series alloys,
  • offers better corrosion resistance with etch,
  • designed for consistent results and better coating weight,
  • allows more flexible pre-treatment process parameters.
CHEMEON TCP-HF SP* (Hex Free)
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It is optimized for spray applications and effective as a pre-paint/powder coat anti-corrosive chemical.
   

CHEMEON TCP-HF (Hex Free)
Spray Bottle*

Small touch-up spray use.

CHEMEON TCP-HF (Hex Free)
Touch-Up Pen*
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Touch-up and field repair use.


* In 2013, CHEMEON Surface Technology, formerly Metalast Surface Technology, acquired all assets of Metalast International, LLC, and is the sole source of products and services known and marketed as Metalast prior to June 10, 2015, now marketed under the CHEMEON mark. CHEMEON is not affiliated with David M. Semas.


The advantages of CHEMEON TCP-HF* (Hex Free) versus current hexavalent chromate are as follows:
  1. Hexavalent chrome is a known carcinogen and highly regulated. TCP-HF contains a small amount of trivalent chrome which is not a carcinogen and is non-toxic.
     
  2. Disposal of hexavalent chrome is more expensive. Hexavalent chrome must be reduced to a trivalent state where the converted trivalent chrome content is precipitated and removed as a non-toxic substance. The wastewater is pH adjusted and sent to drain.  Hexavalent chromate baths require frequent dumps which puts more demand on the treatment system.  Chemicals, manpower and compliance issues are costly.

    TCP-HF, however, uses chrome in its non-toxic trivalent state. The amount of trivalent chrome in the TCP-HF bath is minimal and the rinse waters generate only trace amounts of trivalent chrome in the waste stream.  The rinse water in most cases only requires pH adjustment for discharge to the drain.  A TCP-HF bath is very rarely dumped.  The Navy has operated TCP-HF process baths for over 2 years without dumping and remaking.  TCP-HF solution is simply added back to the tank to account for drag-out and evaporation losses.
     
  3. Hexavalent chromate systems must be heated.  TCP-HF is applied at room temperature and does not require heating.  This saves in energy costs and production down-time during bath start-up.
     
  4. Hexavalent chromates must be ventilated and the air must be discharged within applicable environmental limits.  TCP-HF is odorless and does not require ventilation.  Again, energy, manpower and compliance savings are realized.
     
  5. TCP-HF is a drop in replacement for hexavalent chromates.  Pre-treatment chemistries and application method (Immersion, spray, wipe) will remain the same.  This eliminates the need for additional equipment or system retrofits.
     
  6. TCP-HF is less acidic than hexavalent chromates.  Etching of the part is minimized while the part dimensions are maintained.
     
  7. TCP-HF can withstand temperatures in excess of 500°F allowing for greater process flexibility. Hexavalent chromates do not perform as well when subjected to elevated temperatures.
     
  8. TCP-HF has performed as well or better than hexavalent chromates in a variety of applications and tests. The Navy tested the product on entire airframes for the F/A18 as well as S3 tail sections. The planes were flown for an extended period with excellent long-term results. It has also been tested and approved for the exterior framework of the United States Army Amphibious assault vehicle being manufactured by General Dynamics at GDDS Virginia. Of twenty products tested TCP outperformed all by nearly twice the neutral salt spray corrosion testing.
CHEMEON TCP-HF (Hex Free) Capabilities
Process
Trivalent chromium
   
Applications
Chemical conversion coatings
Anodized aluminum sealer
Passivate and anti-tarnish
   
Industry Specifications and Standards
MIL-DTL-81706B
MIL-DTL-5541F Type I & Type II
MIL-C-5541F Class 1A and Class 3
ROHS
REACH
WEEE
ELV
OSHA PEL
ASTM 3359, ASTM B921
QPL
EO 13148
   

Substrates

Bare aluminum and anodized aluminum
Zinc and zinc alloys
Magnesium
Galvanized steel
IVD
Cadmium
Silver
Brass
Titanium
Stainless Steel
Iron alloys
Zirconium
   
Properties
Extended corrosion resistance
Paint adhesion
Electrical properties
Coating durability
   
Application Methods
Immersion
Spray
   
Corrosion Resistance
336h NSS bare aluminum
3,000h+ anodized aluminum
   
Temperature Exposure
Can be dried at temp exceeding 800°F
Can be baked for hydrogen relief in excess of 500°F for 24+h without loss of performance
   
Product Advantages
Lower solution operating temperature 
Harder than conventional hexavalent
Can be applied and dried in bulk
No topcoat required
Extreme temperature exposure - UP TO 450°F
Average coating weight 22.88 mg/ft2
   
Industries Served
Aerospace
Military/Defense
Automotive
Medical
Cookware
Commercial
Architectural
Marine
Avionics
Electronics
Heavy equipment