Corrosion quickly develops in hidden cavities and lower parts of the body when moisture, dirt, salts, acids get on the surface.
In this regard, during the operation of the car, additional protection is required: the internal surfaces and hidden cavities of the body - by applying special anti-corrosion compounds, and the joints of parts - by applying sealing mastics.
The anti-corrosion treatment materials used are listed in Table 8-1.
Table 8-1. Anti-corrosion compounds for body treatment
Auto Preservatives «Movil» or «Movil-2» are used for the treatment of hidden cavities. It is recommended to treat cavities every 1-1.5 years. It is allowed to treat surfaces previously coated with nigrol and other oils, as well as rusty surfaces. The consumption rate of the autopreservative is 3 kg.
Protective lubricant NGM-ML is used for processing hidden cavities. The cavities of all 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 against corrosion of the bottom of the body and to reduce noise from vibration. The mastic is applied by spraying or manually with a thickness of 1.5-2 mm.
Plastisol D-11A is used to protect the bottom of the body from corrosion, from abrasive wear and for noise insulation. Coating thickness 1-1.5 mm Best adhesion at room temperature to EF-083, FL-093 and BKCh-0207 primers.
Plastisol D-4A is used for sealing welds on the outer areas of the body.
Non-drying mastic 51-G-7 is used for sealing body joints.
The anti-corrosion agent is sprayed into the internal cavities by air or airless spraying.
Air spraying requires compressed air with a pressure of 0.3-0.4 MPa, a spray gun with a tank, rods and elongated nozzles for the gun. The best coating quality is achieved with airless spraying under pressure up to 16 MPa, which allows spraying materials of significant viscosity.