CHEMICAL TREATMENT FIGURE 4
a strong acid and weak base salt; the solution was acidic with pH value ~6. Equation (1) shows the reaction:
Fe + 2H+ q Fe2+ + H2 p (1)
+ in eutrophic freshwaters increased the dissolution rate of iron.12-13
KNO2
The anodic reaction of CS was pro- moted. The higher concentration of NH4
In the solutions, the corrosion rate of
CS decreased owing to the reaction shown in Equation (2):
2Fe2+ 3NOp + L-Fe2
+ 2OH– O3
+ 3NO2 –
q XI[[Q^M ÅTU 02 O (2) KNO3 > KNO2 .
Acknowledgments This research was supported by funds
from the International Scientific and Technological Cooperation Project (No. 2011DFA52400), the Education Commission of Zhejiang Province (No. Y201122332), and the Natural Science Foundation of Zhejiang Province (No. LQ12E01005).
November 2012 MATERIALS PERFORMANCE 57