Page 305 - Corrosion Engineering Principles and Practice

276 C h a p t e r 8 C o r r o s i o n b y W a t e r 277

1
0.9
0.8
Corrosion rate (mm/y) 0.6 22°C
0.7
40°C
0.5
0.4
0.3
0.2
0.1
0
2 4 6 8 10 12 14
pH
FIGURE 8.7 Corrosion of steel in water containing 5 ppm of dissolved oxygen at two
different temperatures as a function of the water pH.

1
0.9
0.8
Corrosion rate (mm/y) 0.6 Steel Aluminum
0.7

0.5
0.4
0.3
0.2
0.1
0
2 4 6 8 10 12 14
pH

FIGURE 8.8 Corrosion of steel and aluminum as a function of pH at the same
temperature (22°C).