Deveco Fusion Black

A TOTALLY NON-CHROME BLACK CONVERSION COATING

Deveco Fusion Black is a NON-CHROME conversion coating, which will produce a glossy black conversion coating on zinc, zinc-iron and zinc-nickel alloy plating.  It completely eliminates all chrome chemicals from plating process. 

This extremely stable process consists of a make-up chemical (Deveco Fusion Black MU) and a replenisher (Deveco Fusion Black R). Control of the solution is easy; simply maintain the solution in the pH range 2.5 to 4.5 using 10% Sulfuric Acid and add 1 gal. Fusion Black R per 1,000 sq.ft. to replenish. 

Sealing the black finish with Dev-Seal Poly-Armor 1 produces a finish that will exceed 168 hours to white corrosion and 400 hrs to red corrosion in salt spray testing.

OPERATING PARAMETERS:

Deveco Fusion Black MU Temperature PH Time

8 to 12% v/v – Use DI or RO water for make-up & replenishment 150 – 170 ^oF (optimum 160 – 170 ^oF) 2.5 to 4.5 45 to 75 seconds

TYPICAL OPERATING CYCLE:

Contact Deveco, a representative would be glad to help identify the best activation cycle.

Ø Zinc Plate (Acid Zinc or Alkaline Zinc)

Ø Rinse

Ø (Optional) The key to good adhesion of the trivalent black film is a good activation.  An initial dip in 2% Sulfuric Acid may be necessary if the parts were baked, or to remove organic brighteners off the surface of the zinc.  With some brightener systems, a 2% Muriatic Acid may work better for this.

Ø 3%  Dev-Zinc Acid Activator HC ~ 20-40 seconds (the parts will begin to darken).

Ø 8 to 12% Deveco Fusion Black

Ø Rinse

Ø 40 to 50% Dev-Seal Poly-Armor 1 (75 to 90 ^oF)   refer to its Technical Data Sheet for operation

Ø Dry –  Part temperature should not exceed 160 ^oF.

o Over-drying may dehydrate the seal, reducing adhesion and corrosion resistance

DEVECO FUSION BLACK

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Deveco Fusion Black also produces a black finish on Zinc-Nickel plating.  There may be some slight iridescence in the finish.

A 1% addition of Dev-Zinc Alloy Additive will help reduce or eliminate the iridescence.

OPERATING NOTES

It is recommended that, while processing in the Deveco Fusion Black process, brightener additions in the zinc plating process are kept to a minimum.  Excessively bright Zinc plated parts may need a 2-step pre-dip or extended time in the pre-dip activation step to remove co-deposited organic materials.

EQUIPMENT REQUIREMENTS

TANK -polypropylene, or koroseal lined tanks.

HEATER - in-tank PTFE heater capable of maintaining 150 to 170 ^oF. 

FILTER - filter to remove the precipitate formed during the process.

CONTROL AND ANALYSIS

PRE-DIPS

· Place a 100 ml sample of Dev-Zinc Acid Activator HC in an Erlenmeyer flask.

· Titrate with 0.2 N Potassium Permanganate until a permanent pink color persists for at least 15 seconds

Calculations:

Mls 0.2 N KMnO₄ x 0.9 = % Dev-Zinc Acid Activator HC

DEVECO FUSION BLACK

· Control the solution by pH with 10% Sulfuric Acid. 

· Maintain the concentration using 1 gal Deveco Fusion Black R per 1,000 sq.ft.

Contact the Technical Sales and Service department at Deveco Corporation for further assistance if necessary.

DISCLAIMER:

The information presented herein, while not guaranteed, is to the best of our knowledge true and accurate.  No warranty or guarantee expressed or implied is made regarding the performance of any products, since the manner of use is beyond our control.  No suggestion for product use or anything contained herein shall be construed as recommendation for its use in infringement of any existing patent and we assume no responsibility or liability for operations which do infringe any such patents.  The above includes confidential and proprietary information of Deveco Corporation and is furnished to you for your use solely on products or processes supplied by us to you.

Product data sheets/BM001, BM004, BM005                          Effective Date: 3-12-07                                   Supersedes: 5-26-06

BM011