  
One 1" by 8" strap is bent sharply at low temperature to remove coating chips. The chips are examined under a microscope at 10-40X magnification to determine porosity and contamination levels. The foam present at the interface and cross-section is determined and rated against known standards such as NACE RPO394-94. The scale is 1 to 5, with 5 being 100 percent foam. The contamination present at the coating's interfacial layer is evaluated and rated using a solution of copper-sulfate. The copper-sulfate will turn steel present on the coating chip a copper color. Oxides will have a black contrast. |
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Bayou Coating LLC
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