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Galvanizing body of BMW M5 E34

The table below shows whether body of M5 E34, made from 1988 to 1995, is galvanized and the quality of processing.
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Year
Processing Type Method Car body condition
1988 No No • applying conventional anti-corrosion layer
• use of low-carbon branded steels with BH
Result of processing: Bad
Car's 36 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.
1989 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• introduction of branded IF steel
Result of processing: Good
Car's 35 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1990 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• use of branded IF steels
Result of processing: Good
Car's 34 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1991 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• use of branded IF steels
Result of processing: Good
Car's 33 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1992 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• use of branded IF steels
• since 1992 the paint coating updated
Result of processing: Good
Car's 32 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1993 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• use of branded IF steels
Result of processing: Good
Car's 31 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1994 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• introduction of branded TRIP steels (solid-nosed strengthening)
Result of processing: Good
Car's 30 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
1995 Partial Electroplating
(double-sided)
• immersion in zinc electrolyte under current
• zinc layer 7 - 14 microns
• use of branded TRIP steels
Result of processing: Good
Car's 29 years old.

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

On such cars, measures could be applied to eliminate noticeable rusting in bends and joints of body.
The information in table is collected from open sources and may contain errors. About sources

Other generations

 – e28 1984–1988

 –e34 1988–1995

 – e39 1998–2003

 – e60 2004–2010

 – f10 2011–2014

 – f10 2015–2018

 – f90 2017–2024

 – 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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