![]() (4 marks) (b) Refer to the attached Pourbaix diagram for the aluminum (Al)-water system at 25 ☌. Assume the temperature is 25 ☌ and PH2 = 0.5 atm. Be sure to state the anodic and cathodic reactions. Determine whether magnesium will corrode with evolution of hydrogen if immersed in 0.05 M MgCl2 solution at a pH of 7. (a) Magnesium (Mg) is a lightweight metal under consideration for automotive applications. Be sure to refer to the attached EMF series. Explain why the engineer should be concerned. During installation, a scratch was found, deep enough to penetrate the coating and expose the underlying steel. (d) An engineer has decided to use a gold-coated steel for piping in a chemical plant, knowing that gold (Au) will remain immune to corrosion. The chloride anions (1 mark) Iron (Fe) being hydrolyzed (Fe reacting with water) (1 mark) (c) Are noble (immune) metals and passive metals considered corrosion-resistant for the same reason? Explain. Explain the role of the following in pitting corrosion: I. (b) Pitting corrosion of stainless steel can occur in a solution with dissolved chloride (Cl), such as salt solutions. Be sure to refer to the attached Pourbaix diagram for the Ti-water system at 25 ☌ in your answer. Explain why Ti is still used for many applications. ![]() The following are general corrosion questions: (a) According to the attached EMF series, titanium (T1) would be considered an active metal (E° = -1.630 V vs SHE). ![]()
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