Prevenção de corrosão

501-25-33 Body Repairs - General Information 501-25-33 DESCRIPTION AND OPERATION Corrosion Prevention The corrosion protection provided in production must be carefully maintained and reproduced during body repair work, in order to ensure the long-term warranty for Ford vehicles. NOTE: Please take the notes in the model-specific repair descriptions into account. Please also note the manufacturer's instructions when handling the different anti-corrosion agents. Only Ford original bodywork components and Ford approved repair materials are to be used for body repairs. The Ford logo is stamped onto every Ford original spare part. Panel coatings and corrosion protection Body steel panels are provided with a coating for corrosion protection purposes. The coating material is predominantly zinc in a variety of composition forms. Aluminum is also used to some extent. Basically, all types of steel sheet can be coated. A variety of coating processes are used: ‡ Hot dip zinc coating. ‡ Electrolytic zinc plating. ‡ Organic coating. ‡ Hot dip aluminum coating. NOTE: Welding fumes are harmful to health. Make certain that the workspace is well ventilated and use welding fume extraction. The following points must be noted when welding: ‡ Zinc starts to melt at about 420°C. ‡ The zinc vaporizes at a temperature of about 900°C. ‡ The amount of heating determines the damage to the zinc coating, and therefore to the corrosion protection. ‡ Resistance spot welding is particularly suitable for welding zinc-coated panels, because no widespread warming occurs. ‡ With electrolytically zinc-plated panels there is no need for any special preparation because the zinc coating does not need to be removed. NOTE: Coated panels have a higher electrical resistance, but this can be compensated for by increasing the welding current by 10 - 20% . Corrosion protection measures during repair work CAUTION: Always be extremely careful when handling solvents, sealants and adhesives. Some products contain substances harmful to health or give off harmful or poisonous vapors. Always follow the manufacturer's instructions. If there is any doubt as to whether a particular solvent is suitable, it must NOT be used. All Ford bodywork components have a cathodic primer. Moreover, most parts are zinc-plated on one or both sides. If possible, these protective layers must not be damaged. Before welding Interior surfaces of new bodywork components which will no longer be accessible after installation must be painted beforehand. The welding flanges are treated with a special welding primer. The joint areas are not always accessible from inside later. Therefore, prepare these areas so that no soot is produced by burning paint during welding. NOTE: In order to ensure that the corrosion protection produced in production is not destroyed, the working area must be kept as small as possible. NOTE: Do not touch cleaned bare metal any more with the bare hands. The dampness of your hands will corrode the metal. Procedure: ‡ Remove the primer or paint/zinc layer in the welding area using a tress wire brush to prevent the formation of soot from the paint. ‡ Thoroughly clean the welding area with a metal cleaning agent and rub dry. ‡ Coat the welding flange with welding primer on all sides and allow to dry. NOTE: The welding primer must only be applied thinly to the spot welding area, to minimize spattering when welding. After welding During repair work, body panels are often heated at very high temperatures, which results in the destruction of the corrosion protection.