(a) A part is made out of two pieces of metal welded together â one iron and one chromium. The part is put into service in a dilute acidic environment with 0.0001 mol/L of HCl acid, 0.004 mol/L of Cr3+ cations, hydrogen gas dissolved with an equivalent partial pressure of .01 atm, and no other dissolved constituents, at a temperature of 90oC. What corrosion reaction(s) will take place? Write both half-cell reactions and the overall reaction. Which material will be the anode and which will be the cathode? The standard emf series is included below. What is the name of the type of corrosion that would occur?
(b) In the situation from part a, what will be the equilibrium potential for the corrosion reaction that takes place? Will the actual corrosion potential be larger or smaller in magnitude than the equilibrium potential, and why?
(a) A part is made out of two pieces of metal welded together â one iron and one chromium. The part is put into service in a dilute acidic environment with 0.0001 mol/L of HCl acid, 0.004 mol/L of Cr3+ cations, hydrogen gas dissolved with an equivalent partial pressure of .01 atm, and no other dissolved constituents, at a temperature of 90oC. What corrosion reaction(s) will take place? Write both half-cell reactions and the overall reaction. Which material will be the anode and which will be the cathode? The standard emf series is included below. What is the name of the type of corrosion that would occur?
(b) In the situation from part a, what will be the equilibrium potential for the corrosion reaction that takes place? Will the actual corrosion potential be larger or smaller in magnitude than the equilibrium potential, and why?
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