Ultra Yellow

E-Chrome Ultra Yellow – High Corrosion resistant trivalent chromate. E-Chrome Ultra Yellow is a two part iridescent trivalent chromate that provides up to 150 hours salt spray resistance to white corrosion with out a topcoat. It does not rub off like other yellow trivalent chromates as it will pass the thumb test. E- Chrome Ultra Yellow offers more UV protection and does not fade in the sun like other yellow trivalent chromates.

Read our Trivalent Yellow Chomates technical paper that was presented at the 2007 NASF Technical Conference.

Read our technical paper that was presented at Sur/Fin’s 2008 Technical Conference on Trivalent Yellow Update and the Diphenyl Carbazide Controversy.

The greatest benefit of E-Chrome Ultra Yellow is that it can be baked for hydrogen embrittlement (375º F 4-24 hours) without the color fading. After baking this corrosion resistance to white rust almost doubles to 300 hours!

Read our brochure for more information on the E-Chrome Ultra Yellow Trivalent Yellow Chromate.

E-Chrome Ultra Yellow is a two compound chromate.

Bath Make-Up

 OPTIMUM

 RANGE
E-Chrome Ultra Yellow A 3% by volume  2-3% by volume
E-Chrome Ultra Yellow B 2% by volume  1-3% by volume

 

Step by Step Application:
Chromating on zinc-plating surfaces with E-Chrome Ultra Yellow is accomplished as follows:

  1. Zinc plate parts to .0003. The brightness of the final finish will be directly related to the brightness of the plated surfaces.

  2. Cold water rinse

  3. 1% by volume Sulfuric Acid, rinse to neutralize residual plating solution

  4. Cold water rinse

  5. Immersion in E-Chrome Ultra Yellow solution for the length of time required to produce the desired finish.

  6. Cold water rinse

  7. Hot Air Dry – 150° F

Operating Conditions

 OPTIMUM RANGE
pH*:1.8 1.65 – 2.0
TEMPERATURE:120° F (54°C)  90°-150°F (32°-66°C)
TIME:1 minute  30 seconds – 5 minutes
AGITATION:Air agitation may be helpful in rack situations

* Lower pH with E- Chrome Ultra Yellow A and B; raise pH with Ammonium Hydroxide

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