Cleveland Black Oxide modified the chemistry used on panels and retaining posts that are part of the 9/11 memorial in New York City to prevent corrosion and formation of a white residue.
The Memorial features two pools that sit where the Twin Towers once stood and huge bronze parapets etched with the names of each person who died. KC Fabrications of Gardiner, N.Y., installed the parapets, and fabricated and finished the retaining posts for the metal panels placed behind the waterfalls. Those panels and retaining posts are finished in black oxide and must be able to survive the harsh chemicals present in the water. During installation, the blackened panels made from marine-grade stainless steel were found to be corroding, leaving a white residue on the surface. KC Fabrications contacted Cleveland Black Oxide, which determined that a galvanic reaction was causing the white residue and modified the black oxide chemistry to solve the problem.