Anti-corrosion body protection

During everyday use of the car, the paintwork and anticorrosion coating of the body is affected by an aggressive environment: anti-icing reagents (in winter time), sand, small stones, vibration and temperature changes, which cause the appearance of microcracks in the protective coating of the body, through which water and oxygen penetrate to the metal surface. As a result of exposure to the body of an aggressive environment, the process of metal oxidation begins (corrosion), which leads to the loss of their strength properties, and the presence of a large amount of salts and acids in water only accelerates the oxidation process.

Corrosion is most susceptible to hollow body profiles, bottom, lower parts of doors and pillars, joints of body parts, including spot welding spots.

Corrosion develops most rapidly in hidden cavities and lower parts of the body when moisture, dirt, salts, and acids enter. In this regard, during the operation of the car, for additional protection of the internal surfaces and hidden cavities of the body, a special anti-corrosion composition is applied, and sealing mastics are applied to the joints of the parts.

The anti-corrosion composition, which is used to treat the internal cavities of the body and the bottom, must meet the following requirements:

• contain corrosion inhibitors;
• be evenly distributed over the entire treated surface and create a protective film that is resistant to vibration and temperature changes;
• have good adhesion with body elements or previously applied coatings;
• be compatible with previously applied paint and varnish coatings and anti-corrosion compounds;
• maintain their physical and chemical properties for a long time under the influence of external factors;
• contain materials that, when processing a car, meet fire and environmental safety standards.

Auto Preservative «Movil» or «Movil-2» used for processing hidden cavities. It is recommended to treat cavities every 1–1.5 years. Autopreservative allows the treatment of surfaces previously covered with nigrol or other oils, as well as rusty surfaces.


Protective lubricant NGM-ML is used for processing hidden cavities. The hidden cavities of new cars are treated with this material.

Protective film coating NG-216B is used to cover parts of the car under the body.

Anti-noise bituminous mastic BPM-1 is used to protect the underbody from corrosion and to reduce noise. Coating thickness 1.0–1.5 mm.

Plastisol D-11A is recommended to protect the bottom of the body from corrosion, abrasive wear and for noise insulation. Coating thickness 1.0–1.2 mm.

Plastisol D-4A is designed for sealing welds.

Non-drying mastic 51-G-7 is used to seal body joints.

The anti-corrosion agent is sprayed into the internal cavities by the method of air and airless spraying.

Air spraying requires compressed air at a pressure of 0.5–0.8 MPa, a spray gun with a reservoir, hoses and gun extensions. The best coating quality is achieved with airless spraying at a pressure of 4–12 MPa, which allows spraying materials of significant viscosity.

For mechanical protection of the wheel arches from small stones and sand, in addition to the standard protection of the arches, installed at the factory, plastic fender liner, additionally installed on the car, is used. The main disadvantages of additional fender liner are drilling additional holes in the wing for their fastening, poor ventilation of the wheel arches, accumulation of dirt and salt in places where the fender liner protrudes above the fender flare.

To protect the paintwork of the front of the hood and the bottom of the doors, special anti-gravel transparent self-adhesive films are used.