Thermoplastic Polyamide-11 powder coatings serve many industries – such as water handling, automotive, and appliances. This utility is based on the ability to simultaneously provide exceptional resistance to: corrosion, impact/abrasion, and numerous chemicals. Typically application is by traditional methods – electrostatic spray or fluidized bed dipping. The present work demonstrates for the first time that the flame spray method can produce Polyamide- 11 powder coatings very close in performance to those produced by traditional methods. The keys are proper substrate pre-heating, and flame conditions that minimize polymer degradation. Coatings performance, impact resistance, and molecular weight data are presented.

In this study, polyamide 11 and polyamide-alumina layers are produced by flame spraying and assessed based on microstructure and corrosion and wear resistance. Among the more notable findings: During the spraying process, there is a loss of crystallinity and polymorphism in the polymer due to high heating and cooling rates. Although some particle degradation occurs in flight, it is does not significantly alter the properties of the polymer. Insufficient substrate temperature impedes the melting of the polymer matrix and embedding of the ceramic filler particles, which has a negative effect on the abrasive wear resistance of the resulting composite layer. Overall, the coatings exhibit good corrosion resistance. During electrochemical testing in a saline solution, there was no electrolyte penetration. Paper includes a German-language abstract.