What is VCI anti-rust powder?
VCI anti-rust powder (Volatile Corrosion Inhibitor) is a powder product specially designed to prevent metals from rusting. It works by continuously releasing corrosion-inhibiting vapors, forming an invisible molecular protective film on the metal surface that prevents moisture and oxygen from coming into contact with the metal.
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◆Learn more:
1. How it works:
Place VCI rust inhibitor powder into a sealed box or tube. The rust inhibitor particles in the powder will automatically evaporate, filling the entire space. These particles will firmly adhere to the metal surface, providing comprehensive protection even in complex deep holes or hidden corners. It is like covering the metal with an “invisible raincoat”.
2. Key features and advantages:
- Easy to use: Can be sprayed directly as a dry powder or placed in a breathable fabric bag inside the equipment. No need to clean or wipe the equipment before use, saving time and effort.
- Comprehensive coverage: The vapor can penetrate every nook and cranny of the component, leaving no dead spots during rust prevention.
Long-lasting protection: In a sealed environment, it typically provides rust protection for several years (e.g.: 2 to 5 years).
3. Common applications
The product is ideal for large enclosed equipment and the internal surfaces of metals that are difficult to lubricate, such as: the internal surfaces of pipes and storage tanks, maintenance of the interiors of engines, compressors and boilers, large wind power plants and ship compartments.
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4.VCI anti-rust powder production process
The production of VCI (Volatile Corrosion Inhibitor) anti-rust powder mainly includes precise weighing, grinding, mixing, drying and packaging to create an organic salt mixture. The core process is to mix multiple corrosion inhibitor components, allowing them to volatilize in an enclosed space and adsorb onto the metal surface to form a dense protective film, thereby preventing rust. Production process:
- Raw material preparation: Prepare inorganic passivating agents (such as sodium molybdate, polycarboxylate salts) and organic corrosion inhibitors (such as benzotriazole, organic amines). Ensure that the formulation does not contain toxic substances such as nitrites.
- Mixing and grinding: Put the above raw materials into a high-speed mixer or ball mill, thoroughly mix and grind them into micron-sized ultrafine powder. Fine particles help improve volatilization and uniform dispersion in an enclosed space.
- Drying treatment: Since some raw materials are hygroscopic, the mixed powder needs to be dehydrated and dried in a drying oven or air dryer to ensure that the moisture content is minimized.
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Packaging and forming:
- Bulk powder: Directly package the powder into sealed, moisture-resistant containers.
- Powder packaging: Use an automatic packaging machine to quantitatively package the rust inhibitor powder into breathable non-woven fabric bags or specialized breathable paper bags to form rust inhibitor powder packets.
5.Application methods:
- Dry application (Direct placement): Place the rust inhibitor powder packets or sprinkle the powder directly into equipment compartments, pipelines, containers, or sealed packaging boxes.
- Wet application (Aqueous solution method): Dissolve the rust inhibitor powder in water to prevent rust on the inner walls of boilers, heat exchangers, and other systems after hydrostatic testing.
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6.Tips for storing VCI rust preventive powder
The most important thing when storing VCI rust preventive powder is to prevent moisture and keep it tightly sealed. The product must be stored indoors in a cool, dry, and well-ventilated environment, with the room temperature controlled between 5°C and 30°C. Unused product after opening must be resealed in an airtight bag to prevent premature evaporation of the rust-preventive gas and loss of effectiveness. Points to note when storing VCI rust preventive powder:
- Keep sealed: Do not damage the original packaging before opening. After opening, if not in use, tightly seal the bag opening with plastic wrap or an airtight bag.
- Control temperature and humidity: Preventing moisture is very important. Relative humidity should be below 60%. Avoid storing at high temperatures or in direct sunlight.
- Keep away from harmful substances: Keep away from acidic, alkaline, or volatile chemicals, and also keep away from sources of fire.
Store in a dry place: Do not place the powder directly on wet surfaces. The powder should be placed on shelves and kept away from dust.
