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"We had finished parts sectioned, mounted, polished and examined under a microscope with the hopes of identifying deficiencies within our coating system that cause premature failure. One of the items brought up are oxides trapped within scratches and scale texture under the e-coat. The substrate is hot-rolled-steel (recycled steel) bar that has been steel shot blasted then put through the standard cleaning process prior to e-coating. Have you ever heard of or seen steel shot blasting driving oxides into small crevices or texturing natural to hot-rolled steel? We cannot seem to figure out why these oxides are still present after shot blast and pickling."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/articles/troubleshooting-the-pretreatment-and-paint-process>