Issue link: http://www.e-digitaleditions.com/i/862794
POWDER COATING, August 2017 19 time of coating with which the archi- tect was unhappy. Based on my limited experience and assessment of the poles after we had fin- ished powder coating, the following is my best guess as to what the issues are. For those of you with far more experi- ence assessing hot-dip galvanize (HDG), I would be grateful for your feedback. The first issue was that the galvanize was delaminating on some recessed HSS between 1-inch-thick plate. Bare steel was not visible, and our employees know to stop if bare steel is visible on a galva- nized piece. In this case, the top zinc layer had disbanded from the first zinc layer, resulting in the profile visible underneath the coating, as shown in Photo 4. The second issue that we were faced with was a surface that had bumps visi- ble under the coating, as depicted in Photo 5. From my limited experience, this roughness is either due to zinc spat- ter or dross inclusions. In both cases, the AGA identifies these as acceptable to a point. In the case of the dross inclusion, so long as it is covered with a layer of zinc it is acceptable. At the site meeting, I faced inquiries from my customer and the architect about why we would have accepted the posts in that state. I explained that galvanize is a func- Chain of custody—Relationship, communication, and product flow Incoming inspection City Relationship Product Flow Communication General Contractor Fabricator Galvanizer Aegis Architect Photo 1 Photo 2 Photo 3 Installed parts