As detailed in the article “Outgassing and Powder Coating Defects” by PF Online, metals commonly used in fabrication, such as iron, steel, and aluminum, often contain minute holes or voids, leading to outgassing issues during the curing process after powder coating.
Common causes of outgassing defects include trapped gases in castings, galvanized substrates, surface contamination, and excessive coating thickness. To mitigate these issues, proper outgassing procedures are crucial. This involves heating the substrate to expel trapped gases, ensuring thorough surface cleaning, and adhering to recommended coating thickness.
The importance of these procedures is emphasized to prevent defects such as bumps, bubbles, and pinholes, which can compromise coating adhesion and necessitate rework.
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