Sodium nitrite uses mechanical antirust treatment

In industrial production, the use of sodium nitrite is very common, and the concrete has both rust and freeze protection. In winter, it is mainly used as a coagulation and antifreeze agent; in summer, it is mainly reflected in the anti-rust and anti-rust treatment. How can the best anti-rust treatment of sodium nitrite on mechanical parts be done?

Nitrite products are common rust inhibitors in the construction machinery industry. Mainly through the isolation of metal machinery and chloride ions, increase the critical value of chloride ions to prevent rusting of mechanical parts. The main methods are as follows:

1. Immerse the mechanical parts in the aqueous solution of 5% sodium nitrite and 0.6% sodium carbonate for a little longer time, and the anti-rust effect is very good.

2. Mechanical parts can be immersed in sodium nitrite solution with higher concentration, such as a solution containing 15% -20% sodium nitrite and 0.6% sodium carbonate. The immersion time is determined according to the time required to maintain.

3. Apply the sodium nitrite solution to the mechanical parts, and apply multiple times to the parts that are easily corroded, such as mechanical connections.

4. Spraying sodium nitrite solution to carry out anti-rust treatment of mechanical parts. The commonly used formula is 5% -10% sodium nitrite plus 0.6% sodium carbonate, which can be adjusted according to demand.

5. Anti-corrosion treatment of steel bar in concrete can be added as concrete admixture, the general usage is about 3%. This method can also be used as a derusting treatment for concrete buildings.