GF98.00-U-9200A Paint Damage Evaluation: Corrosion Damage

GF98.00-U-9200A Paint Damage Evaluation: Corrosion Damage

1. Definition
The term corrosion comes from Latin "corrodere" = gnaw.

Corrosion according to DIN 50 900:
"Reaction of metallic material with its environment causing a measurable change in the material and capable of leading to a negative effect to the function of a metallic component or an entire system."
The corrosion process is supported by temperature, humidity and aggressive substances. The corrosion product on materials such as steel and iron is rust.

2. Causes
Atmospheric corrosion is the form of corrosion which occurs most frequently on vehicles. Causal and/or accelerating factors include:
- Damage to the surface protection down to the substrate from stone impact, crushed gravel, mechanical effects, assembly and other types of damage.
- Weak points in the surface protection.
- Thawing salt (sodium chloride, calcium chloride, magnesium chloride).
- High relative humidity.
- Short-term temperature change, i.e. heated garage.
- Wash water containing salt, i.e. from car washes with recirculated water which is not treated properly.
- Highly alkaline washing water and atmospheric contamination (aggressive gases and dusts).

3. Consequences
Dot-shaped corrosion starting from damaged or weak spots, edges, surfaces and crimps. When such corrosion is not eliminated at an early date it can result in rusting through.

4. Evaluation
In order to ensure uniform evaluation of corrosion damage we have illustrated the corrosion with colored pictures according to rust rating 0-5 for surface rust based on DIN 53 210.
The various colored illustrations are intended to allow objective evaluation and eliminate the subjective element to the greatest possible extent.

The figures show the rust rating series 1-5 with corrosion produced under laboratory conditions and rust rating series 1-5 with corrosion on body sheet metal exposed to weathering.
The structure of the migration is clearly recognizable with the corrosion samples produced under laboratory conditions.

Within a series of rust ratings we differentiate between the partial or complete area
- A surface (chapter "Definitions: Spot or surface corrosion")
- A crimp (chapter "Corrosion at crimps")
- An edge, a flange (chapter "Corrosion on edges, on flange") or a joint.

Component Identification:

Component Identification: