How many years will it take to uniformly corrode a thickness

Assignment Help Civil Engineering
Reference no: EM13559034

(a) A galvanized (zinc-coated) steel sheet is found to uniformly corrode with an average current density of 1.4 X 10-7 A/cm2. How many years will it take to uniformly corrode a thickness of 0.030 mm of the zinc coating?

(b) A new Al container develops pits right through its walls with an average current density of 1.25x10-4 A/cm2. If the average pit is 0.50mm in diameter and the aluminum wall is 0.85 mm thick, how many days will it take for a pit to corrode through the wall. Assume the pit has a cylindrical shape and that the corrosion current acts uniformly over the surface area of the pit. For Al corroding: Al? Al3+ + 3e-

Reference no: EM13559034

Questions Cloud

Find the maximum kinetic energya photo electron can have : Ultraviolet light of wavelength 218 nm shines on a zinc surface. If the workfunction of zinc is 4.3 ev, what is the maximum kinetic energya photo electron can have
What investment can be justified for the new surface : Annual maintenance cost for a particular section of highway pavement are $2000. The placement of a new surface would reduce the annual maintenance cost to $500 per year for the first 5 years and to $1000 per year for the next 5 years. After 10 years ..
How much money is required in the trust fund : At 6% interest, how much money is required in the trust fund to provide for the laboratory and equipment and its perpetual operation and equipment replacement?
If the property can be sold what is the rate of return : An investor has invested $250,000 in a new rental property. Her estimated annual costas are $6,000 and annual revenues are $20,000. What rate of return per year will the investor make over a 30-year period ignoring
How many years will it take to uniformly corrode a thickness : A galvanized (zinc-coated) steel sheet is found to uniformly corrode with an average current density of 1.4 X 10-7 A/cm2. How many years will it take to uniformly corrode a thickness of 0.030 mm of the zinc coating?
Evaluate the temperature of the compressed air : In an internal combustion engine, air at atmostpheric pressureand a temperature of about 20 degrees celcius is compressed in the cylinder by a piston to 1/9 of its original volume, Estimate the temperature of the compressed air
The mechanical properties of aluminum may be improved : The mechanical properties of aluminum may be improved by incoporating fine particles of lauminum oxide (al2O3) Given that the moduli of electricity of this material are respectively 69GPa and 393 GPa plot modulus
Compute the mass of the object : A spring is hung from a ceiling,and an object attached to its lower end stretches the spring by adistance of 5.00 cm from its unstretched position when the systemis in equilibrium. determine the mass of the object
What is the probability that you will avoid the collision : For a car traveling 35 mph the distance required to brake for a stop is normally distributed with mean of 55 feet and standar deviation of 8 feet. You are traveling 35 mph in a residential area and a car moves abrupt into your path at a distance of 6..

Reviews

Write a Review

Civil Engineering Questions & Answers

  What is the maximum internal pressure for the maximum stress

If the maximum stress that the tank can sustain equals 22.857 ksi, determine the required thickness (to the nearest 1/4 inch). If the tank wall thickness is specified to be 2.25 inches.what is the maximum internal pressure

  Show that car must have exceeded the speed limit of 55 mph

As a highway patrol officer, you are patricipating in a speed trap. A car passes your patrol car which you clock at 55 mph. One and a half minutes later, your partner in another patrol car situated two miles away from you, clocks the same car at 5..

  Determine the linear interpolation function of displacement

Consider a 2D triangular element with the three vertices at 1[1,1], 2[1,2] and 3[2,2]. the displacements at these t hree points are [0.1,0.1], [0.3,0.2] and [0.4, 0.3] mm for point 1,2,and 3 respectively

  What is the significance of the compresive strength

If the pulleys are fixed to the shaft, determine the magnitude of the tension T and the x,y,z componenet sof reaction at the smooth thrust bearing A and smooth journal bearing B.

  How to determine the two possible depths of flow

A 200 m wide natural stream, whose cross-section can be approximated by a rectangular cross-section, contains a dischargeof 80 cumecs. If the specific energy of the flow is 1.5 timesthe minimum specific energy

  What is the penetration h for the pile

A pile resists the tension developed by three stay cables for a major for a tent (membrane) structure. Assuming no bending is desired in the pile (no resultant horizontal componenet), what is the magnitude of the force S if the and (theta sub S)

  Sustainable soil and water management of agricultural fields

Write an essay on the topic "application of geophysical techniques using electromagnetic induction as a tool for sustainable soil and water management of agricultural fields in the humid tropic Caribbean. components:

  Find what is the concentration of pepper in mg per l

one gram of pepper is placed into a 100 mL beaker, and the beaker is filled with water to the 100 mL mark. What is the concentration of pepper in mg/L. What should one assume in this problem

  What is h2co3-hco3-co3 2 and partial pressure of co2

The total dissolved inorganic carbon (TIC) of a sample of groundwater is 8.33 mM. The temperature of the aquifer is 15C, the pH is 7.5, and the ionic strength is 0.05 M. What is the H2CO3, HCO3-, CO3 2-, and the partial pressure of CO2

  Determine its thermal conductivity k between two surfaces

Two surfaces of a 2cm thick plate are maintained at 0*C and 80*C, respectively. Heat is transferred through the wall at a rate of 600 W/m^2., determine its thermal conductivity,k.

  Formulate an optimization problem to help the company find

Three parallel rural routes connect two cities A and B.  Traffic on these routes mainly consists of heavy trucks for a logging company, and passenger vehicle flow can be neglected.  The performance functions of these three routes are

  Determine the temperature differences in each month

A 100 lb force vector F is aligned from A to B. Point A is located at the coordinates (2, 2, 2) and point B at (4,5,6). Calculate the moment of F about the y axis.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd