1.2 Material influences
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| Causes | Effects / remedies |
|---|---|
| A galvanic element is created under the effects of moisture by contact with materials such as copper, tin, nickel, iron and zinc. | This plating process causes aluminium to be removed from the joint. This results in surface corrosion or pitting. New parts and accessory parts which have been approved by the BMW Group for aluminum (screws, washers, nuts etc.) have undergone special surface treatment. Such parts must not be replaced by conventional parts.
NOTE:
Damaged parts lose this protection and must be specially coated or replaced. Damage caused by contact corrosion is excluded from the warranty. |
| Materials also used for work on steel components can implant steel particles in the softer surface of an aluminium component. | Surface corrosion or pitting occurs. A separate tool kit is available for processing/machining aluminum. |
| Surfaces are attacked when fluxing agents are used. | Soldering is not permitted for joining aluminum components. Risk of corrosion from chemical factors. |
| Aluminum/steel grinding dust from adjoining work areas. | This results in surface corrosion. Erection of protective barriers. |