11.20.2. Anticorrosive protection of a body

Hollow profiles of a body, the bottom, the lower parts of doors and 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 of moisture, dirt, salts, acids. In this regard in use the car for additional protection of internal surfaces and the hidden cavities of a body put special anticorrosive structure, and in connections of details — sealing mastics. The applied materials for anticorrosive processing are specified in tab. 11.1. Movil or Movil-2 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 noise reduction. Thickness of a covering is 1,0–1,5 mm.
The plastisol of D-11A is used for protection of the bottom of a body against corrosion, against abrasive wear and for a noise isolation. Thickness of a covering is 1,0–1,2 mm. The plastisol of D-11A processed the bottoms of new cars. The plastisol of D-4A 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 anti-corrosive agent is applied with way of air and airless dispersion. At air dispersion compressed air with 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 of 4–12 MPas which allows to spray materials of considerable viscosity.

Table 11.1 Anticorrosive structures for processing of a body