Page 85 - Corrosion Engineering Principles and Practice
P. 85
C h a p t e r 4
62
–0.65
0.6151
0.241
0.926
0.318
0.340
saturated
Saturated
a SO 42 – = 1
a CU2 + = 1
HgO + 2 e − + 2 H + = Hg + H 2 O
−2
Hg 2 SO 4 + 2 e − = 2 Hg + SO 4
Cu +2 + 2 e − = Cu (sulfate
E o − 0.0295 log 10 a SO 42 –
E o + 0.0295 log 10 a CU2 +
Equilibrium reaction T coefficient Potential (mV °C –1 ) (V vs. SHE) Conditions and Nernst equation 0.00 pH = 0 2 H + + 2 e − = H 2 E o − 0.059 pH −0.6 0.2224 a Cl− = 1 AgCl + e − = Ag + Cl − .. 0.2881 0.1 M KCl E o − 0.059 log 10 a Cl− .. 0.235 1.0 M KCl .. 0.199 Saturated (KCl) .. ~0.2
E o − 0.059 pH
solution)
Standard hydrogen electrode (SHE)
Name Silver chloride Calomel Mercurous sulfate Mercuric oxide Copper sulfate TABLE 4.7
