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Galvanizing body of Cadillac Seville 4st gen

The table below shows whether body of Seville 4st generation, made from 1991 to 1997, is galvanized and the quality of processing.
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Year
Processing Type Method Car body condition
1991 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
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.
1992 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
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.
1993 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
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.
1994 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
Result of processing: Good
Car's 28 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 Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
Result of processing: Good
Car's 27 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 rusting is already noticeable in hidden cavities and joints.
1996 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
Result of processing: Good
Car's 26 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 rusting is already noticeable in hidden cavities and joints.
1997 Partial Hot-dip Galvanizing
(one-sided)
• zinc melt on steel
• zinc layer 2 - 10 microns
• use of low-carbon branded steels with BH
Result of processing: Good
Car's 25 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 rusting is already noticeable in hidden cavities and joints.
The information in table is collected from open sources and may contain errors. About sources

Other generations

 –4 1991–1997

 – 5 1997–2004

 – all Models Cadillac

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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