Whether the aluminum cam lock coupling needs to be coated with PTFE depends on the specific application scenario and cannot be generalized. The following is a scenario description:

1. Scenarios requiring PTFE coating
Strong corrosive medium environment: If the coupling is exposed to chemicals such as acid, alkali, solvents, etc. for a long time (such as chemical pipelines, electroplating solution transportation), PTFE coating can isolate the aluminum substrate from the corrosive medium, avoiding damage to the aluminum alloy oxide layer and causing pitting corrosion.
High requirements for anti sticking and anti fouling: When used for the transportation of food, pharmaceuticals, or viscous materials (such as syrup and resin), PTFE's low surface energy characteristics can prevent the material from sticking to the inner wall of the connector, reducing cleaning frequency.
Wear resistance and low friction requirements: In frequent disassembly or high-speed fluid scenarios (such as aviation fuel injection, particle slurry transportation), PTFE coating can reduce cam rotation resistance and sealing surface wear, extending service life.

2. Scenarios that do not require PTFE coating
Ordinary industrial fluid transmission: When transporting media such as water and low corrosive oils, the aluminum alloy's own oxide film is sufficient for protection, increasing the amount of PTFE reverse reflection.
Sealing relies on gaskets: The sealing performance of cam locks mainly relies on gaskets such as nitrile rubber and fluororubber, regardless of whether the aluminum surface is coated with PTFE.
Cost sensitive or non critical systems: The PTFE coating process is complex (requiring sandblasting, high-temperature sintering, etc.), and excessive investment is required for non strict scenarios.

3. Key considerations before coating
Matrix pretreatment is necessary: The surface of aluminum alloy needs to be treated with degreasing, anodizing, etc., otherwise the PTFE coating is prone to peeling off.
Carefully select coating type:
Pure PTFE coating is relatively soft and has limited wear resistance. In frequent friction situations, it is recommended to use modified PTFE (such as filled with fiberglass);
FDA/USP VI certified coatings are required for food and pharmaceutical applications.
Compatibility of gaskets: If rubber gaskets have been used for the coupling, it is necessary to confirm that there are no adverse reactions between the PTFE coating and the gasket contact surface.