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Galvanizing body of BMW 7 E23

The table below shows whether body of Bmw 7 E23, made from 1977 to 1987, is galvanized and the quality of processing.
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Year
Processing Type Method Car body condition
1979 No No • applying conventional anti-corrosion layer
• use of branded RS steel
Result of processing: Bad
Car's 45 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1980 No No • applying conventional anti-corrosion layer
• use of branded RS steel
Result of processing: Bad
Car's 44 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1981 No No • applying conventional anti-corrosion layer
• use of branded RS steel
Result of processing: Bad
Car's 43 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1982 No No • applying conventional anti-corrosion layer
• introduction of branded steels with BH
Result of processing: Bad
Car's 42 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1983 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
Result of processing: Bad
Car's 41 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1984 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
Result of processing: Bad
Car's 40 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1985 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
• since 1985 the paint coating updated
Result of processing: Bad
Car's 39 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion spreads in extensive stage.

Such cars have repeatedly used measures to eliminate severe rusting.
1986 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
Result of processing: Bad
Car's 38 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion of body moved into vast stage.

These vehicles have undergone repairs to remove rust.
1987 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
Result of processing: Bad
Car's 37 years old.

Considering the car's age and quality of the zinc processing, under normal operating conditions corrosion of body moved into vast stage.

These vehicles have undergone repairs to remove rust.
The information in table is collected from open sources and may contain errors. About sources

Other generations

 –e23 1977–1987

 – e32 1986–1998

 – e38 1998–2001

 – e65 2001–2008

 – f01 2012–2015

 – g11 2015–2024

 – all Models BMW

Types of processing

If the galvanized car body is damaged, corrosion destroys the zinc, not the steel.

•  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!

Galvanizing methods

•  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.

Testing

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)

Paint / 5 µm

Enamel / 40 µm

Base / 20 µm

Ground / 30 µm

Ground / 20 µm

Zinc coating / 12-15 µm

Steel

Car with Electroplating coated
(zinc layer 5 - 10 microns)

Paint / 5 µm

Base / 10 µm

Paint / 5 µm

Base / 10 µm

Ground / 20 µm

Ground / 5 µm
Zinc coating / 5 µm

Steel

Paint / 20 µm

Base / 10 µm

Paint / 20 µm

Base / 10 µm

Ground / 15 µm

Ground / 10 µm
Zinc coating / 10 µm

Steel

Car with Cold Galvanizing
(zinc layer 10 microns)

Base and Paint / 15 µm

Ground / 35 µm

Ground / 15 µm

Zinc-containing coating / 10 µm

Steel

Car with Zincrometal

Paint / 25 µm

Base / 10 µm

Ground / 25 µm

Ground / 20 µm

Steel

Car without galvanizing

Enamel and Paint / 40 µm

Ground / 25 µm

Ground / 15 µm

Steel

Important information

•  Over the years manufacturers have improved the galvanizing technology of their cars. The younger the car the better it is galvanized!

•  A coating with a thickness of 2 to 10 microns (micrometers) provides excellent protection against the occurrence and spread of corrosion damage.

•  The destruction rate of the active zinc layer in the place of damage to the car body is from 1 to 6 microns per year. Zinc is more actively destroyed at elevated temperatures.

•  If the manufacturer does not add "full-body" to the term "galvanizing", it means that only impact-prone elements have been processed.

•  Pay more attention to the presence of a manufacturer's warranty on the car body than loud phrases about galvanizing from advertising.

Other info

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