The mechanism of the corrosion cell can explain the theoriesthat these five
categories operate on.
7.1.2 Corrosion Cell
Ac orrosion cell is formed on am etal surfacew heno xygen and water are
present. Refer to Figure 7.2.The electrochemical reactions taking place in the
corrosion cell are:
Anodic reaction (MZ metal):
M / M
n C C ne
Cathode
area
Anode
area
Air
o 2
o 2
Electrolyte
OH −
OH −
M n +
e
e
Metal
Metal
FIGURE 7.2
Structureo fcorrosion cell.
(7.1)
Coatings
405
CAT8247—CHAPTER 7—17/10/2006—15:02—TRGANESH—XMLM ODEL B–pp. 403–485