This outcome consists of:

1. Problem definition

2. Problem formulation

3. Problem solving

Each team are asked to solve a problem to fulfill this outcome.

Referring to Chapter (4) titled Corrosion electrochemistry in the course CHE 311 (Corrosion Engineering), each team is asked to derive a few relationships that relates the corrosion rates and current density which are given for single metals as shown in Table 2 below:

Table 2: Relationships among corrosion rates

and current density

mdd = 89.55 103 i M/n (4.4)

gmd = 8.955 103 i M/n (4.5)

mpy = 1.287 105 i M/n D (4.6)

ipy = 1.287 102 i M/n D (4.7)

mmy = 3.27 103 i M/n D (4.8)

Where (i) is the current density in A/cm2, M is the atomic weight and n is the oxidation state and D is the density in g/cm3

The each team tasks are:

1. To derive Eqn. (4.4), Eqn. (4.6), and Eqn. (4.8) for metals

2. Also to derive Eqn. (4.4), Eqn. (4.6), and Eqn. (4.8) for alloys and then

c) To solve Pr.6 given in Tutorial 4 using the derived relationships

The statement of Pr. 6

Calculate the corrosion rate in mdd, mmy and mpy equivalent to 3 A/cm2 for Inconel 600 alloy.