Reference no: EM131693593

Instructions Prepare your answer via a software suitable for you but digitally useable. Indicate references for each questions.

Question 1
(a) Using appropriate data sources (to be cited correctly) make a reasonably accurate sketch or graph of a Pourbaix diagram for silver.
(b) Using appropriate data sources (to be cited correctly) make a reasonably accurate sketch or graph of a Pourbaix diagram for nickel.
(c) Overlay the Pourbaix diagram for water on each of the diagrams in parts (a) and (b), and use this to discuss the corrosion stability of these metals in contact with water.
(d) Use the Pourbaix diagrams in parts (a) and (b) to discuss some of the methods of corrosion protection.

Question 2
(a) Draw another diagram overlaying the Pourbaix diagrams for nickel and silver.
(b) Use this diagram to explain the likely outcome of holding a solution of nickel ions in a silver container.
(c) Use this diagram to explain the likely outcome of holding a solution of silver ions in a nickel container.

Question 3
(a) Using appropriate data sources (to be cited correctly) make a reasonably accurate sketch of Evan's diagram for iron immersed in vigorously agitated diluted hydrochloric solution at pH 5 at 30 °C. The surface to volume ratio of this iron piece is small. In other words, there is no change in solution pH.
The diagram should exhibit correct corrosion potential and corrosion current density.
(b) Describe what could happen if the solution become stagnant. Using appropriate data sources to modify Evan's diagram accordingly.