Page 270 - Corrosion Engineering Principles and Practice
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244    C h a p t e r   7                                                                                       C o r r o s i o n   F a i l u r e s ,   F a c t o r s ,   a n d   C e l l s    245






































                      FIGURE 7.36  Advanced stage on the belly of a Boeing 737, where the
                      corrosion products have expanded to the point where a number of rivets
                      have actually popped their heads (Courtesy Mike Dahlager, Pacific Corrosion
                      Control Corp.).



                               –0.40            –0.65            –0.35
                                 V                V                V
                                + –              + –              + –



                                                                          Ground





                              Old pipe         New pipe          Old pipe

                                              Anodic area
                                               Corrosion
                      FIGURE 7.37  Schematic showing a differential corrosion cell created by
                      replacement of a section of pipe.
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