60. . The greater the emf of a cell (anode emf minus cathode emf), the greater the tendency that corrosion will occur. For the following corrosion cells, write the anode and cathode reactions in salt water and the initial cell emf, please see attached table. MF table ? a) Mild steel and zinc. b) 1100 aluminum and copper EMF table TABLE 20-1 The electromotive force (emf) series for selected elemerts Electrode Potential Metal (V) - 3.05 - 2.37 - 1.66 - 1.63 - 1.63 -0.76 - 0.74 - 0.44 Anodic Li - Li* + c* Mg - Mg* + 2e Al + Al+ + 3e Ti* + 2e" Mn2+ + 2e" Ti - Mn Zn -- Zn* + 2e Čř + Cr* + 3e" Fe . Fe+ + 2c- Ni Ni+ + 2c' Sn -+ Sn* + 2e Pb - Pb?* + 2c" -0.25 - 0.14 -- 0.13 0.00 +0.34 +0.40 + 0.80 + 1.20 + 1.23 + 1.5 H2 + 2H* + 2e" Cu - Cu?+ + 2c" 4(OH)" + O2 + 2H,O + 4e- Ag - Ag* + e- Pt Pt* + 4e¯ 2H,0 + 0, + 4H + 4c- Au+ + 3c" Cathodic Au -
60. . The greater the emf of a cell (anode emf minus cathode emf), the greater the tendency that corrosion will occur. For the following corrosion cells, write the anode and cathode reactions in salt water and the initial cell emf, please see attached table. MF table ? a) Mild steel and zinc. b) 1100 aluminum and copper EMF table TABLE 20-1 The electromotive force (emf) series for selected elemerts Electrode Potential Metal (V) - 3.05 - 2.37 - 1.66 - 1.63 - 1.63 -0.76 - 0.74 - 0.44 Anodic Li - Li* + c* Mg - Mg* + 2e Al + Al+ + 3e Ti* + 2e" Mn2+ + 2e" Ti - Mn Zn -- Zn* + 2e Čř + Cr* + 3e" Fe . Fe+ + 2c- Ni Ni+ + 2c' Sn -+ Sn* + 2e Pb - Pb?* + 2c" -0.25 - 0.14 -- 0.13 0.00 +0.34 +0.40 + 0.80 + 1.20 + 1.23 + 1.5 H2 + 2H* + 2e" Cu - Cu?+ + 2c" 4(OH)" + O2 + 2H,O + 4e- Ag - Ag* + e- Pt Pt* + 4e¯ 2H,0 + 0, + 4H + 4c- Au+ + 3c" Cathodic Au -
Chapter21: Potentiometry
Section: Chapter Questions
Problem 21.16QAP
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Transcribed Image Text:60.
. The greater the emf of a cell (anode emf minus cathode emf), the greater the
tendency that corrosion will occur. For the following corrosion cels, write the
anode and cathode reactions in salt water and the initial cell emf, please see attached
table. MF table ?
a) Mild steel and zinc.
b) 1100 aluminum and copper
EMF table
The electromotive force (emf) series for
TABLE 20-1
selected elemerts
Electrode
Potential
Metal
(V)
Li + Lit + e
Mg* + 2e
Al+ + 3c"
Ti* + 2e"
Mn2+ + 2e"
Zn* + 2e
Čř + Cr+
Fe .
- 3.05
- 2.37
-1.66
- 1.63
- 1.63
-0.76
Аnodic
Mg
Al --+
Ti
Mn +
Zn -
- 0.74
- 0.44
- 0.25
- 0.14
-- 0,13
+ 3e"
Fe* + 2e
Ni2+ + 2c"
Sn -+ Sn?* + 2e
Pb + Pb?* + 2c"
Ni
+ 2H* + 2e"
0.00
+0.34
+ 0.40
+ 0.80
+ 1.20
+ 1.23
+ 1.5
Cu -
Cu²+ + 2c"
Oz + 2H,0 + 4e".
Ag
Pt Pt* + 4e"
2H,0
Au - Au+ + 3c"
4(OH)"
Ag* + c-
O, + 4H* + 4c
Cathodic
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