Full-body — the car body is fully processed, including hidden and hard-to-reach cavities.
Partial — all nodal points and most vulnerable parts of the car body, thresholds, bottom, bottom of the doors are processed.
Nodal points processing — includes only processing of welding places, fasteners, stamping and other small parts.
Over years the processing is changed. The younger car the better it's galvanized!
Hot-dip Galvanizing — best method (high corrosion resistance, resistance to mechanical influences, partial regeneration).
Electroplating — good method (less corrosion resistance that matches perfectly with the paint and primer).
Zincrometal — acceptable method (metal with an elastic coating on a zinc base, low anti-corrosion properties, low resistance to mechanical influences).
Cold Galvanizing — bad method (anaphoretic soil with an admixture of zinc is not able to resist corrosion).
Steel with a protective coating based on zinc - zincrometal, it contains three components:
1 — zincrometal (zinc solution in epoxy resin) 10-20 microns
2 — dacromet (zinc variance inchromic acid water solution) 2-5 microns
3 — sheet of steel
The presence of zinc particles in ground covering the car body does not affect it's protection and is used by the manufacturer for word "Zinc Coated" in advertising.
Test results of cars that came off the conveyor with the same damage (cross) on the bottom of front right door are presented below. The tests were carried out in laboratory. Conditions in a chamber with hot salt fog for 40 days correspond to 5 years of normal operation.
Car with Hot-dip Galvanizing (zinc layer 12 - 15 microns)