9.11. Anticorrosive protection of a body

Preparation and anticorrosive processing of the hidden cavities
Restoration противо corrosion and antinoise covering of a bottom of a body and arches of wheels



The bearing hollow profiles of a body, the bottom, the lower parts of doors, racks, and also connections of details of a body, including the place of spot welding are most of all subject to corrosion.
Most quickly corrosion develops in the hidden cavities and the lower parts of a body at hit on the surface of moisture, dirt, salts, acids.
In this regard in use the car additional protection of internal surfaces and the hidden cavities of a body by drawing special anticorrosive structures, and in connections of details putting sealing mastics is required. The applied materials for anticorrosive processing are specified in tab. 9-1.

Protovokorrozionny structures for processing of a body Table 9-1
Name of structure
Brand
Working viscosity at 20 °C on VZ-4, with
Type of solvent, thinner
Drying mode
temperature, °C
time, min.
Autopreservative of thresholds
MOVIL
15B40
White spirit, gasoline
20
20-30
Protective lubricant, non-drying
NGMVML
45
White spirit
20
15
Protective film covering
NGV216B
18-22
White spirit, gasoline
20
20
Mastic antinoise
BPMV1
high viscosity
Xylol, сольвент
100-110
30

or 24 h at
18-20 °C
Plastic compound polyvinyl chloride
DV11A plastisol
high viscosity
-
130
30
Plastic compound polyvinyl chloride
DV4A plastisol
high viscosity
-
130
-
Mastic non-drying
51VGV7
high viscosity
-
-


Movil autopreservative is used for processing of the hidden cavities. It is recommended to process cavities every 1-1,5 year. Autopreservative allows processing of the surfaces which are earlier covered nigroly or other oils, and also rusty
surfaces.
The NGM-ML protective lubricant is applied to processing of the hidden cavities. This material processed the hidden cavities of new cars.
The protective film covering of NG-216B is used for a covering of parts of the car under a body.
Mastic antinoise bituminous BPM-1 is applied to protection against corrosion of the bottom of a body and to reduction of noise from vibration. Apply mastic with dispersion or manually 1,0-1,5 mm thick.
The plastisol of D-11A is used for protection of a bottom of a body against corrosion, against abrasive wear and for a noise isolation. Thickness of a covering is 1,0–1,2 mm. Adhesion of a plastisol to EF-083 and FL-093 soil.
The plastisol of D4A is applied to sealing of welded seams.
Non-drying mastic 51-G-7 is used for sealing of joints of a body.
In internal cavities anticorrosive substance napylivatsya by way of air or airless dispersion.
At air dispersion compressed air by pressure of 0,5-0,8 MPas, the gun-kraskoraspylitel with a tank, hoses and lengthening nozzles for the gun is required. The best quality of a covering is reached at airless dispersion under pressure
4–12 MPas which allows to spray materials of considerable viscosity.