2. The difference in electric potentials across a metallsolution interface is co

Question

2. The difference in electric potentials across a metallsolution interface is commonly referred to as an electrode potentials Write the potential in the galvanic series for seawater (versus a saturated calomel electrode) and the potential using the EMF Series versus a standard hydrogen electrode) for each metal in pair (a) below and then write difference between the voltage values (in V). Next, do the same for pair (b). (c) What pair will likely more quickly? the estimated (Use the tables provided on the next page. For the ga series, use center value of the voltage range in the table.) (a) Aluminum alloys and 316 stainless steel aluminum for aluminum alloys in the EMF series. Use iron Fe in the series for alloys in the EMF (b) Magnesium and aluminum alloys (Use aluminum for aluminum series.

Explanation / Answer

a) for Aluminium and iron

E0Al = -1.66 V [anode , low reduction potential value]

E0Fe= 0.77 V [cathode, high reduction potential value]

The difference in electrode potenitals = Ecathode - Eanode = 0.77 + 1.66 = 2.43 V

b) for second pair

E0Mg = -2.36 V [anode , low reduction potential value]

E0Al = -1.66 V [cathode, high reduction potential value]

The difference in electrode potenitals = Ecathode - Eanode = -1.66 + 2.36 = 0.7 V

c) as the potential difference in iron and aluminium alloy is more so it will corrode faster.

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