CoatingsPro Magazine

JUL 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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54 JULY 2018 COATINGSPROMAG.COM Never Again Detail of girts exhibiting rust staining By D. Terr y Greenfield, Principal Consultant — CorroMetrics Services, Inc. When the Steel and Coating Are New…But White Shows Everything! I was tasked with evaluating the various coatings systems (aka paint) that had been installed at a new manufacturing facil- ity under construction; they were exhibiting defects. e project was a design-build and utilized a prefabri- cated metal building system as the core of its construction. e evaluation was prompted by concerns of corrosion that was evident on structural steel members, girts, joists, and the ceiling side of the roofing panels. At this point in time, the facility was nearing completion with limited testing and qualification-related operations of the installed manufacturing systems currently in process. Corrosion and staining were obvious on most of the structural steel components as well as the ceiling side of the roofing panels along with most ancillary construc- tion members. On-Site Observations Typically, most structural steel components manufactured for use in prefabricated metal buildings are coated with a red oxide alkyd primer over a Society for Protective Coatings (SSPC) Surface Preparation (SP) 2: Hand Tool Cleaning. Generally, the mill scale is not removed from the steel so long as it's adherent and is a stable surface, per the requirements of SSPC-SP-2, which is determined by not being removable with a dull putty knife. It's significant to note that in this case, the surfaces had not been coated with a red oxide primer but instead were coated with a white alkyd primer. e result was that any corrosion and rust staining on the surface was easily Photos courtesy of D. Terr y Greenfield Corrosion and staining were obvious on most of the structural steel components as well as the ceiling side of the roofing panels along with most ancillary construction members.

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