Calculate the value of the constant K for the CPR in mpy and i in μA/cm2 (10−6 A/cm2).

1. (a) Demonstrate that the CPR is related to the corrosion current density (A/cm2) through the expression

 

where is a constant, is the atomic weight of the metal experiencing corrosion, is the number of electrons associated with the ionization of each metal atom, and is the density of the metal.

(b) Calculate the value of the constant for the CPR in mpy and in μA/cm2 (106 A/cm2).

2. Compute the corrosion penetration rate, in mpy, for the corrosion of iron in citric acid (to form Fe2+ ions) if the corrosion current density is 1.15 ×10A/cm2.

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erive the differential equations in terms of the liquid heights h1 and h2.

  Figure 7.18 shows a liquid-level system in which two tanks have cross-sectional areas A1 and A2, respectively. The volume flow rate into tank 1 is qi. A pump is connected to the bottom….

Derive the differential equation relating the liquid height h and the volume flow rate qi at the inlet.

  Consider the single-tank liquid-level system shown in Figure 7.19, where the volume flow rate into the tank through a pipe is qi. The liquid leaves the tank through an orifice….

Derive the differential equations in terms of the liquid heights h1 and h2.

Figure 7.20 shows a hydraulic system of two interconnected tanks that have the same cross-sectional area of A. A pump is connected to tank 1. Assume that the relationship between the….