Download PDF by Xiaoge Gregory Zhang: Corrosion and Electrochemistry of Zinc

By Xiaoge Gregory Zhang

ISBN-10: 1475798776

ISBN-13: 9781475798777

ISBN-10: 1475798792

ISBN-13: 9781475798791

Humankind's use of zinc stretches again to antiquity, and it used to be an element in a few of the earliest identified alloy structures. even if metal zinc was once no longer "discovered" in Europe until eventually 1746 (by Marggral), zinc ores have been used for making brass in biblical occasions, and an 87% zinc alloy used to be present in prehistoric ruins in Transylvania. additionally, zinc (the steel) used to be produced in volume in India way back to the 13th century, good earlier than it was once well-known as being a separate aspect. The makes use of of zinc are manifold, starting from galvanizing to die castings to electronics. it's a hottest anode fabric in high-energy-density batteries (e.g., Ni/Zn, Ag/Zn, ZnJair), in order that its electrochemistry, relatively in alkaline media, has been widely explored. within the passive kingdom, zinc is photoelectrochemically energetic, with the passive movie showing n-type features. for a similar cause that zinc is taken into account to be an outstanding battery anode, it has discovered large use as a sacrificial anode for the safety of ships and pipelines from corrosion. certainly, apart from zinc's recognized attributes as an alloying aspect, its common use is especially as a result of its electrochemical homes, which come with a well-placed place within the galvanic sequence for shielding iron and metal in typical aqueous environments and its reversible dissolution habit in alkaline solutions.

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Additional resources for Corrosion and Electrochemistry of Zinc

Sample text

At pH > 12 a dissolution-precipitation mechanism operates whereas at pH < 12 a solid-phase process dominates. - ions promotes zinc dissolution whereas the presence of HPO;- ions inhibits it. 5. In saturated solutions of zinc sulfate, a thin pore-free salt layer forms, and zinc dissolution occurs through a direct reaction of zinc with sulfate ions to form solid zinc sulfate [888). The presence of Pb and Sn in alkaline solutions has been found to inhibit zinc dissolution as a result of the formation of a smooth inert surface film [27).

The reference numbers in the figure are from Bradd and Leger [532]. Reprinted by courtesy of Marcel Dekker, Inc. 44 CHAPTER 2 ---11,----------------------, -10 • Ref.

19. Hydrogen overpotential on Zn in 6N KOH. After Lee [71. and overpotential is observed. 8. 8. 2 7 311 7 o 01 . _0 ~

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Corrosion and Electrochemistry of Zinc by Xiaoge Gregory Zhang


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