Lubricity of Electrophoretic Coating with PTFE on Anodic Oxide Film of Aluminum

Polytetrafluoroethylene or PTFE is known as an excellent lubricant. In this study we examined the possibility of electrophoretic coating in a PTFE emulsion bath with silane coupling, and ammonium oxalate as an electrolyte on an anodic oxide film of aluminum. As the result, the coating showed good uniformity, durability and lubricity. The coating weight is in the range of 1–2 mgdm–2 and the kinetic friction coefficient value is in the range of 0.08–0.20. The silane coupling contributes to elevate the water resistance, adhesive property and lubricity of the coating.