Using Table 2, determine if copper has the tendency to corrode in 1) a deaerated
ID: 1061214 • Letter: U
Question
Using Table 2, determine if copper has the tendency to corrode in 1) a deaerated
environment, and 2) an aerated environment. Find the driving force for the corrosion reaction in
volts, assuming unit activities. Also, write the total corrosion reaction. Note: The formation of
Cu2+ is favored over that of Cu+ when copper corrodes.
TABLE 2. Electromotive Force Series Standard Potential Electrode Reaction (in volts) at 25°C 3+ 1.50 Au 3e Au 2+ 2e ca. 1.2 Pd 2e Pd 0.987 Hg 2e Hg 0.854 Ag e 0.800 2+ Hg, 2e 2Hg 0.789 Cu Cu 0.521 e 2+ Cu 2e Cu 0.337 2e 0.000 2+ 2e Pb 0.126 2+ Sn 2e Sn 0.136 Mo 3e Mo ca. 0.2 2+ Ni 2e Ni 0.250 Co 2e Co 0.277 T1 0.336 3+ In 3e In 0.342 2+ Cd 2e Cd 0.403 2+ Fe 2e Fe 0.440 3 Ga 3e Ga 0.53 3e Cr 0.74 Cr 2e Cr 0.91 2 Zn 2e Zn 0.763 3+ Nb 3e Nb 1.1 ca 2+ Mni 2e Mn 1.18 4e Zr 1.53 2+ Ti 2e Ti 1.63 3+ 3e Al 1.66 4e Hf 1.700 3 3e 1.800 2+ Be 2e Be 1.85 2+ Mg 2e Mg 2.37 Na Na e 2.71 2+ 2e Ca 2.87 e 2.93 Li Li 3.05 O2 4H 4e 2H20 1.229Explanation / Answer
1) the areated system allows more in the copper due to oxidiation process.
Cu2+ + O2 = 2CuO ., Cu2+ + 2e - = Cu
The driving force of the corrosion rate is given by transfer of electron from the metal.
the electrode potentional for the corrosion of copper in the aerated system is = -0.184 volts.
2)In deaerated system corrosion rate low due to absence of oxgyen
Cu+ + e- = Cu
the electrochemical potentional for the deaerated system is = - 0.023 volts
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