Section 1 - Principle of Electropolishing
MCP - Metal Coating Process, LLC
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1. Define electropolishing.
a. Electropolishing is a method to simultaneously deburr, smooth, brighten and passivate the surface of stainless steel and some other metals.
b. Electropolishing is an anodic electro-chemical process which is the reverse of plating.
c. Electropolishing is an anodic dissolution process.
d. All of the above
2. List the uses of electropolishing
a. Burr removal.
b. Improved corrosion resistance.
c. Improved clean-ability.
d. All of the above
3. What is the anode?
a. Positive terminal.
b. Negative terminal.
c. None of the above.
d. All of the above.
4. What is the cathode?
a. Positive terminal.
b. Negative terminal.
c. None of the above.
d. All of the above.
5. What is the gas anode?
a. Helium
b. Nitrogren
c. Hydrogen
d. Oxygen
6. What is the gas cathode?
a. Helium
b. Nitrogen
c. Hydrogen
d. Oxygen
7. Describe the characterization curve.
a. Volts vs. amps
b. Volts vs. temperature
c. S.F. vs. temperature
d. None of the above.
8. The amount of metal removed id proportional to what 2 things?
a. S.G., time
b. current, time
c. temperature, S.G.
d. Tank size, temperature
9. Name the two types of electropolishing.
a. Micropolishing an dmacropolishing
b. Matte and satin
c. Solar and green
d. ISO & FFA
10. Define the term passivation.
a. Passiviation implies removal of free iron from the surface.
b. Passivation results in decrease in activity with environment.
c. A passive film is non-crystalline or glassy.
d. All of the above.
11. Name a passivation spec.
a. Q957
b. A967
c. B747
d. T219
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Section 2 - Fundamentals of Electropolishing
MCP - Metal Coating Process, LLC
01. Who did investigations at Battelle?
a. Pierre Jaquet
b. Charles Faust
c. Faraday
d. Elkington
02. Define Bielby layer.
a. A mechanically smeared surface.
b. An anodic film
c. A white residue
d. None of the above
03. The anodic fil is also known as the ____________
a. Bielby Layer
b. Jaquet Layer
c. Faust Layer
d. Faraday Layer
04. Describe the preferential removal of the elements in their respective order.
a. Iron, chromium, nickel, manganese
b. Chromium iron, nickel, manganese
c. Iron, nickel, manganese, chromium
d. Iron, manganese, nickel, chromium
05. What happens at the low end of the characterization curve?
a. Brightening
b. High chrome-iron ratio
c. High voltage
d. Pitting
06. Explain the effect of high moisture in the atmosphere.
a. No effect
b. Bath will absorb moisture, parts will be dull.
c. Will cause more oxygen, parts will be streaked,
d. Will cause rapid rise in temperature.
07. To determine S.G. correctly what other parameter needs to be tested?
a. % Hydrogen
b. % Fe
c. % Oxygen
d. % Nitric
08. When referring to Ohm’s Law what does conductivity equal in the equation?
a. Amps vs volts
b. KW
c. Amps/volts
d. Volts/amps
09. What is the rule of thumb for metal removal?
a. 1500 amp-min/Ft² removes 0.0005”
b. 1200 amp-min/ Ft² removes 0.0002”
c. 2500 amp-min/ Ft² removes 0.0005”
d. 2000 amp-min/ Ft² removes 0.0002”
10. How much can you expect to improve the Ra?
a. 70-80%
b. 60-70%
c. 50-60%
d. 40-50%
11. Calculate the time required to run 2 Sq.Ft. with an application of 300 ASF.
a. 2 ft² x 1200 amp-min/ft² = 2400 amp-min. 2400 amp-min/300 = 8 min.
b. 2 ft² x 1500 amp-min/ft² = 3000 amp-min. 3000 amp-min/300 amps = 10 min.
c. 2 ft² x 2000 amp-min/ft² = 4000 amp-min. 4000 amp-min/300 amps = 13.3 min.
d. 2 ft² x 2500 amp-min/ft² = 5000 amp-min. 5000 amp-min/300 amps = 16.7 min.
12. How much Ni+² is removed in grams per amp-hour?
a. 27.9 grams/26.8 amp-hrs. = 1.042 gram/amp hr.
b. 18.6 grams/26.8 amp-hrs.= 0.698 gram/amp.hr.
c. 8.7 grams/26.8 amp-hrs. = 0.323 grams/amp.hr.
d. 29.3 grams/26.8 amp-hrs. = 1.095 grams/amp.hr.
13. Define coulomb.
a. Coulomb is a unit of electrical charge.
b. Coulomb is a chemical ion.
c. Coulomb is a quantity of gas.
d. Coulomb is a unit of radiation.
14. Where will the highest current density be located on a part that is the shape of a cylinder 1-inch in diameter and 16-inches in length?
a) At the mid-section.
b) 1/3 of height.
c) 2/3 of height.
d) At the ends of the cylinder.
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