Dull zinc plating, patchy black oxide, non uniform brass antique/patina caused from metal cleaning problem. Cleanliness is next to Godliness.
Posted By Eric Olander on January 13, 2017
EPi Blog Acid Salts
EPi Black Oxide 10 gallon test line for blackening steel and cast iron
Posted By Eric Olander on November 9, 2016
Are Trivalent Chromates really Hexavalent Chromates after Salt Spray Testing?
Posted By Eric Olander on November 12, 2007
The latest Plating Surface Finishing magazine has an article by Tom Rochester that states that trivalent chromates under salt spray testing result in hexavalent chrome when using the diphenyl carbizide indicator test.
We at EPi tried this on panels that had been salt sprayed at Technimet and are...
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