During wet corrosion which of the following couple will exhibit severecorrosion of Zn: (a) Zn connected with Fe, (b) Zn connected with Cu, (c)Zn connected with Ni and (d) Zn connected with Sn.Give your answer with proper explanation.
Question
During wet corrosion which of the following couple will exhibit severecorrosion of Zn: (a) Zn connected with Fe, (b) Zn connected with Cu, (c)Zn connected with Ni and (d) Zn connected with Sn.Give your answer with proper explanation.
Solution
The severity of corrosion when zinc (Zn) is connected with another metal during wet corrosion depends on the relative positions of the metals in the electrochemical series. The electrochemical series is a list of elements in the order of their standard electrode potentials. Metals that are located higher in the series will corrode more severely when connected with a metal lower in the series.
(a) Zn connected with Fe (Iron): Iron is located below Zinc in the electrochemical series. Therefore, Zinc will corrode more severely than Iron.
(b) Zn connected with Cu (Copper): Copper is located below Zinc in the electrochemical series. Therefore, Zinc will corrode more severely than Copper.
(c) Zn connected with Ni (Nickel): Nickel is located below Zinc in the electrochemical series. Therefore, Zinc will corrode more severely than Nickel.
(d) Zn connected with Sn (Tin): Tin is located below Zinc in the electrochemical series. Therefore, Zinc will corrode more severely than Tin.
In conclusion, Zinc will exhibit severe corrosion when connected with any of the metals mentioned above during wet corrosion. However, the severity of corrosion will be the highest when Zinc is connected with Copper, as Copper is located farthest from Zinc in the electrochemical series.
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