rate of Icorr = 6.0 x 100 A pl-1 and its density is p =

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
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A carbon steel plate is exposed to stagnant seawater containing dissolved oxygen
and a corrosion rate of icorr = 6.0 x 10-5 A cm-² is measured. The molar mass of iron
is M = 55.8 g mol-¹ and its density is p = 7.8 g cm-³.
(a) What is the corrosion rate of the steel plate in mmpy?
(b) A zinc plate is then electrically connected to the carbon steel plate and both
are immersed in seawater. Which material will form the anode and which
the cathode in the resulting galvanic couple? Justify your answer.
(c) Write down the relevant anodic and cathodic reactions for (b).
(d) Sketch the galvanic couple showing the anodic and cathodic reactions and
the direction of the electron flow.
Transcribed Image Text:A carbon steel plate is exposed to stagnant seawater containing dissolved oxygen and a corrosion rate of icorr = 6.0 x 10-5 A cm-² is measured. The molar mass of iron is M = 55.8 g mol-¹ and its density is p = 7.8 g cm-³. (a) What is the corrosion rate of the steel plate in mmpy? (b) A zinc plate is then electrically connected to the carbon steel plate and both are immersed in seawater. Which material will form the anode and which the cathode in the resulting galvanic couple? Justify your answer. (c) Write down the relevant anodic and cathodic reactions for (b). (d) Sketch the galvanic couple showing the anodic and cathodic reactions and the direction of the electron flow.
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