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Table 1: Potential difference
Metal	Potential (V)
Magnesium	+2.37
Aluminium	+1.66
Zinc	+0.76
Chromium	+0.74
Iron/steel	+0.44
Magnesium alloys	+0.95
Tin	+0.14
Copper	+0.34
Copper-Nickel alloys	+0.35
Nickel	+0.25