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9/27/01 AC 43.13-1B CHG 1 6-11. GENERAL. All corrosive attacks be gin on the surface of the metal making the classification of corrosion by physical appear ance a convenient means of identification. (See figure 6-3.) 6-13. PITTING CORROSION. Pitting corrosion is one of the most destructive and intense forms of corrosion. It can occur in any metal but is most common on metals that form protective oxide films, such as aluminum and magnesium alloys. It is first noticeable as a white or gray powdery deposit, similar to dust, which blotches the surface. When the deposit is cleaned away, tiny holes or pits can be seen in the surface. (See figures 6-5(a) and 6-5(b).) These small surface openings may penetrate deeply into structural members and cause damage completely out of proportion to its sur face appearance. FIGURE 6-5(a). Pitting corrosion (external view). FIGURE 6-5(b). Pitting corrosion (magnified cross sec tion). SECTION 2. TYPES OF CORROSION FIGURE 6-3. Corrosion attack. 6-12. GENERAL SURFACE CORRO- SION. General surface corrosion (also re ferred to as Uniform Etch or Uniform Attack Corrosion) is the most common form of corro sion and results from a direct chemical attack on a metal surface and involves only the metal surface. (See figure 6-4.) General surface cor rosion usually occurs over a wide area and is more or less equal in dispersion. On a pol ished surface, this type of corrosion is first seen as a general dulling of the surface, and if allowed to continue, the surface becomes rough and possibly frosted in appearance. The discoloration or general dulling of metal cre ated by exposure to elevated temperatures is not to be considered general surface corrosion. FIGURE 6-4. General surface corrosion. Par 6-11 Page 6-5PDF Image | AFS-640
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