Question 3: : Estimate the corrosion rate (g/cm².s), penetration rate (mm/yr), and Ecorr (V) for a zinctank containing oxygen free solution (pH =0). Assume the anodic reaction is under activation control andcathodic reactions is under activation and concentration control with the limiting current density for hy-drogen reduction on Zn is 5×10-5 A/cm?. [Zn**] = 1M at 298 K. The atomic weight of zinc is 65.4 g/mol.Density of zinc is 7.13 g/cm³.io, Zn = 1×10-7 A/cm², ßa= 0.09 V/decadeio, H= 1×10-10 A/cm?, Bc= -0.08 V/decadeicorr = 1.2×10-4 A/cm2

This problem is related to fluid mechanics. Fluid mechanics is the subject of mechanical engineering…

Answered: Question 3: : Estimate the corrosion…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question 2 Estimate the corrosion rate (g/cm².s), penetration rate (mm/yr), and Ecorr (V) for a zinc tank containing oxygen free solution (pH =0). Assume both anodic and cathodic reactions are under activation control. [Zn] = IM at 298 K. The atomic weight of zinc is 65.4 g/mol. Density of zinc is 7.13 g/em'. io, Zn = 1x10" A/cm², ßa = 0.09 V/decade io, H=1×1010 A/cm², ße= -0.08 V/decade 0.4 -0.6 Zn Ze 2e Zn? Zn -0.8 10-1 10-1 104 10 104 104 CURRENT DENSITY (A/cm?) POTENTIAL. E
Nickel experiences corrosion in an acid solution according to the reaction Ni + 2H† → Ni²+ + H, (a) The rates of both oxidation and reduction half-reactions are controlled by activation polarization. Compute the rate of oxidation of Ni (in mol/cm2-s) given the following activation polarization data: For Nickel For Hydrogen V(H/H,) = 0 V i, = 6 × 10-7 A/cm² B = -0.10 V(NINP") = -0.25 V io = 10¬8 A/cm² B = +0.12 (b) Compute the value of the corrosion potential.
(b) Figure 1 shows a schematic diagram of the corrosion mechanism which involved steel structure. air Na 0, Na OH он shield FelOH), H' H Fe e passive film steel Figure 1: Corrosion mechanism (i) Identify the type of corrosion according to the schematic diagram shown in Figure 1. Justify your answer by explaining the corrosion mechanism. (ii) Suggest the methods to prevent the corrosion shown in Figure 1.
Consider de-oxidation by the addition of ferromanganese (60 percent Mn) to molten steel at 1600°C.The initial oxygen content is 0.04 wt%. It has to be brought down to 0.02 wt%. Calculate the quantity of ferromanganese required per tonne of steel. The manganese content of steel before de- oxidation is 0.1 wt%. (MnO) + [Fe] = [Mn] + (FeO) Given: K Mn at 1873 K = 0.4 K Fe-Mn at 1873 K = 0.156 Assumptions: Fe and Mn form ideal solutions
In preventing corrosion of iron, a stronger reducing agent called sacrificial anode such as zinc is used to coat iron. Select one: True False
Discussion: 1- Define the corrosion and mention its types? 2- What is the effect of solution aeration on corrosion rate? 3- Compare corrosion rate for a metallic sample immersed in acidic solution with that immersed in a salt solution. 4- What is the effect of the exposure period on the corrosion rate? 5- Discuss the relationship between weight loss and time.
Question: 4 A sheet of copper is exposed to oxygen at 1000°C. After 100 h, 0.245 g of copper are lost per cm' of surface area; after 250 h, 0.385 g/ cm² are lost; and after 500 h, 0.560 g/ em are lost. i. Determine whether oxidation is parabolic, linear, or logarithmic ii. Calculate the time required for a 0.76-cm sheet of copper to be completely oxidized. The sheet of copper is oxidized from both sides.
Explain about the Erossion Corrosion in terms of :- -Factors influence -Mechanism -Affects(Surface of films, Effect of pH, Velocity Effects). -Preventions -Prone areas Summarized all the information by using MIND MAP.
1. (A) The heat treatment of a material (lets say "steel") will affect it corrosion performance? why/why not?. (B) A pice of Zn metal is exposed to three different environments as shown below. Which case will have the highest corrosion rate and why? 山山山 Zn Zn Zn HCL HCL + Oxygen HCL Onygen Fe (C) Ddifference betweenActive and passive material/metals?
Sodium chloride (NaCI) is a ceramic that has the following crystal structure. Given: R(Na*)= 0.098 nm and R(CI")=0.181 Calculate the lonic Packing Factor (IPF) of NaCl? O Na CH Select one: O a. 0.14 O b. 0.66 C. 0.51 O d. 0.74 O e. 0.41 O f. 0.47 g. 0.21
For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode. (a) Aluminum and cast iron (b) Inconel and nickel (c) Cadmium and zinc (d) Brass and titanium (e) Low-carbon steel and copper
Q3/ A: Answer the following: 1- when does fretting corrosion occur? 2- when does stress corrosion occur? 3-Explain effect of distance on the galvanic corrosion? 4- State the cause of the selective corrosion? 5- What Does Transpassivation mean?

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