How to prevent rust on metal screw-in protective plugs - Wuxi Sinceriend New Material Technology Co., Ltd.

1. Choose Rust-Resistant Materials

Selecting metal screw-in protective plugs made from inherently corrosion-resistant materials is the first line of defense.
Opt for plugs crafted from stainless steel (particularly 304 or 316 grades, which contain chromium and nickel for enhanced rust resistance) or aluminum alloys, which form a natural oxide layer that inhibits corrosion.
Avoid plain carbon steel plugs for high-moisture environments, as they lack protective elements and rust easily when exposed to water or humidity.

Adding protective coatings to metal plugs can significantly reduce rust risk.
Apply a thin layer of rust-inhibiting paint, enamel, or epoxy designed for metal surfaces, ensuring full coverage of threads and gaskets.
For ongoing protection, use specialized lubricants or anti-rust sprays containing corrosion inhibitors.
Reapply coatings periodically, especially after cleaning or if signs of wear appear, to maintain a continuous protective barrier.

Ensure a tight, secure fit during installation to minimize exposure to moisture.
Use thread seal tape (PTFE tape) compatible with metal surfaces to create a watertight seal between the plug and the opening.
Avoid over-tightening, which can damage protective coatings or cause metal fatigue.
After installation, inspect the seal regularly and re-tighten or reapply tape if leaks or looseness are detected.

Note: PTFE tape should be applied clockwise for right-hand threads to prevent unraveling during installation.

Clean metal plugs periodically to remove dirt, salt, or other corrosive substances that accelerate rust.
Use a soft cloth and mild detergent, avoiding abrasive cleaners that scratch protective coatings.
After cleaning, dry the plugs thoroughly to prevent moisture retention.
For outdoor or high-humidity applications, schedule more frequent inspections—look for discoloration, pitting, or early rust spots.

When not in use, store metal plugs in a dry, well-ventilated area away from direct water or high humidity.
Use airtight containers or moisture-absorbing packets in storage to reduce ambient moisture.
For plugs installed in harsh environments, consider additional barriers like protective caps or covers when the plugs are not actively in use.
Avoid contact with incompatible metals that can cause galvanic corrosion.