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May 8 - May 12, 2017

What type of coating system (and surface prep) should be used to protect a steel factory roof that is subject to hydrochloric acid vapors and other industrial pollutants and particulates in a hot, humid environment?

Selected Answers

From Antonio Moreno of INTERCHEM 2000 C.A. on May 17, 2017:
Novolac vinyl ester is the best option  for handling HCl. However, you have to do a lot of planning before applying this coating system, from specs to field/onsite application.

From William Slama of International Paint/Ceilcote Products on May 16, 2017:
Epoxy systems would not be a good choice for HCl vapors. A two-coat, flake-filled vinyl ester coating will be fine for this. It could be either glass- or mica-flake-filled. I would recommend 15-25 mils dft per coat. Important would be pre-cleaning to remove all (<2 micrograms per square centimeter) of chloride ion contamination before abrasive blasting.

From Per Gabrielsson of Free Lance Consultations and Inspections on May 15, 2017:
1500 um of glass-platelet-reinforced vinyl ester, provided the roof plating is thick enough for a Rz profile of 75-100 um when abrasive blasted. An epoxy could in the long run turn out to be too hard and brittle as it ages, as it is believed that the roof may "live."

From Warren Brand of Chicago Corrosion Group on May 13, 2017:
We've worked on projects just like this in the past. Without knowing more information, and trusting my memory (always iffy) we used a multi-coat, vinyl ester system. I don't remember the DFT or surface prep. Surface prep will be a balance of what's possible, given the environment, and what's required by the manufacturer. If memory serves, we used a surface-tolerant epoxy followed by the vinyl ester system.

From Raymond Merrill of Texas Department of Transportation on May 9, 2017:
Ditto Mr. Neale. Is the factory roof a steel roof or is the roof on a steel manufacturing facility, or both, for starters?

From trevor neale of TF Warren Group on May 8, 2017:
Suggest more information is required. Is this for interior or exterior surfaces, a new structure or repaint. Is the geographic environment marine, industrial,  rural or a combination?

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Tagged categories: Chemical Plants; Chemical resistance; Coating Materials; Steel

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