I participated in the annual NASF Milwaukee Branch Five Minute Supplier showdown held on April 1st, 2008.
This quick five minute presentation was about the Diphenyl Carbazide (DC), indicating hexavalent chrome after ASTM B-117 salt spray testing, controversy that Tom Rochester discussed in the October 2007 issue of Plating Surface Finishing magazine. Tom discovered that you take a trivalent chromate and test it with DC prior to salt spray and it tests negative for hex chrome. After ASTM B-117 salt spray the test was positive.
EPi we used the test method ISO 3613:2000(E) section 5.6 using a spectrophotometer both prior and after salt spray with negative results in both tests. We also tested our E-Chrome Ultra Blue and E-Chrome Ultra Yellow using Tom Rochester method after salt spray. We found out that our trivalent chromates do not test positive using the DC method.
Eric also talked briefly on a new trivalent yellow E-Ultra Yellow 300 that will be coming out this summer. Eric will be giving a more detail about this presentation on June 17th, 2008 at Sur/Fin's technical conference Automotive Symposium Track II at 2-5 pm in Indianapolis, IN at the Indy Convention center.