Assignment 6 - electrode that is immersed in a solution of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 of 2 FACULTY OF ENGINEERING AND APPLIED SCIENCE ENGR 4250 - Advanced Materials Engineering Instructor: Dr. Ali Keshavarz TA: Maryam Talimi ASSIGNMENT # Due Date: Thursday March 24, 2011 at noon. Please submit your assignment with this cover page by noon to drop-box #3 located on ground floor OPG Building. Question 1 2 3 4 Total Mark NAME: ID: 6
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 of 2 Solve the following problems 17.2 (a) Write the possible oxidation and reduction half-reactions that occur when magnesium is immersed in each of the following solutions: (i) HCl, (ii) an HCl solution containing dissolved oxygen, (iii) an HCl solution containing dissolved oxygen and, in addition, Fe 2+ ions. (b) In which of these solutions would you expect the magnesium to oxidize most rapidly? Why? 17.7 An electrochemical cell is constructed such that on one side a pure nickel electrode is in contact with a solution containing Ni 2+ ions at a concentration of 3 × 10 -3 M. The other cell half consists of a pure Fe
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: electrode that is immersed in a solution of Fe 2+ ions having a concentration of 0.1 M. At what temperature will the potential between the two electrodes be +0.140 V? 17.12 A thick steel sheet of area 400 cm 2 is exposed to air near the ocean. After a one-year period it was found to experience a weight loss of 375 g due to corrosion. To what rate of corrosion, in both mpy and mm/yr, does this correspond? 17.17 Lead experiences corrosion in an acid solution according to the reaction Pb + 2H + → Pb 2+ + H 2 The rates of both oxidation and reduction half-reactions are controlled by activation polarization. (a) Compute the rate of oxidation of Pb (in mol/cm 2-s) given the following activation polarization data: For Lead For Hydrogen V (Pb/Pb 2 + ) = − 0.126 V V (H + /H 2 ) = 0 V i = 2 × 10 –9 A/cm i 2 = 1.0 × 10 –8 A/cm β = +0.12 2 β = –0.10 (b) Compute the value of the corrosion potential....
View Full Document

This note was uploaded on 06/02/2011 for the course ECONMICS ECN204 taught by Professor Brenan during the Spring '08 term at Ryerson.

Page1 / 2

Assignment 6 - electrode that is immersed in a solution of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online