Baking Yellow Chromate E-PASSivate Yellow Red and E-Chrome Ultra Yellow Save Time and Money!

Posted by on

One of the challenges with yellow hexavalent chromates is the temperature of the chromate film cannot go above 150 F without losing all of its corrosion protection.

EPi now has two solutions for the zinc finisher that result in long-lasting corrosion protection and slightly change color during the baking process. See before and after pictures below.

 

E-Brite Ultra Chlor AP passivated with E-Chrome Ultra Yellow prior to baking. 

 

Process Steps using Hexavalent Yellow:

1) Zinc Plate part

2) Unrack parts

3) Bake parts for hydrogen embrittlement

4) Rerack parts flash zinc plate

5) Yellow hexavalent chromate

 

Ultra Yellow after baking for 24 hours at 375F.

Process Steps for using Ultra Yellow or E-PASSivation Yellow Red:

1) Zinc Plate parts

2) Passivate with Ultra Yellow or E-PASSivation Yellow Red

3) Bake Parts at 375 F for 4-24 hours

 

E-Brite Ultra Chlor AP acid zinc plating passivated with E-PASSivate Yellow Red before baking. 

E-PASSivate Yellow Red after baking or 24 hours at 375F. 

A zinc finisher now can save labor costs and time for parts that have to be baked. Listed below are the salt spray ASTM B-117 corrosion results before/after baking for 24 hours at 375 F.

                                                                 Before                           After

Ultra Yellow                                           150 hours                     300 hours

E-PASSivate Yellow Red                       250 hours                    over 350 hours and still going strong in the salt spray chamber at the date this blog was written.

Stay tune to the final results. We would be happy to provide a sample or do small parts in our lab.

 

 

Comments