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A steel sheet metal part has total surface area = 36 in2. How long will it take to deposit a copper
\r\nplating (assume valence = +1) of thickness = 0.001 in onto the surface if 15 amps of current are
\r\napplied?
A part made of sheet steel is to be nickel plated. The part is a rectangular flat plate that is 0.075 cm
\r\nthick and whose face dimensions are 14 cm by 19 cm. The plating operation is carried out in an acid
\r\nsulfate electrolyte, using a current = 20 amps for a duration = 30 min. Determine the average
\r\nthickness of the plated metal resulting from this operation.
Twenty-five jewelry pieces, each with a surface area = 0.5 in2 are to be gold plated in a batch
\r\nplating operation. (a) What average plating thickness will result if 8 amps are applied for 10 min in
\r\na cyanide bath? (b) What is the value of the gold that will be plated onto each piece if one ounce of
\r\ngold is valued at $900? The density of gold = 0.698 lb/in3
A sheet metal steel part with surface area = 15.0 in2 is to be chrome plated. What average plating
\r\nthickness will result if 15 amps are applied for 10 minutes in a chromic acid-sulfate bath?
\r\n
A sheet metal steel part with surface area = 100 cm2 is to be zinc plated. What average plating
\r\nthickness will result if 15 amps are applied for 12 minutes in a chloride electrolyte solution?
What volume (cm3) and weight (g) of zinc will be deposited onto a cathodic workpart if 10 amps of
\r\ncurrent are applied for one hour?
There are 20 correct answers in the following multiple choice questions (some questions have multiple
\r\nanswer(a).s that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each
\r\ncorrect answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and
\r\neach additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score
\r\non the quiz is based on the total number of correct answers.
\r\n28.1 Which of the following are reasons why workparts must be cleaned in industry (four best answers):
\r\n(a) to avoid air pollution, (b) to avoid water pollution, (c) to enhance appearance, (d) to enhance
\r\nmechanical properties of the surface, (e) to improve hygiene conditions for workers, (f) to improve
\r\nsurface finish, (g) to prepare the surface for subsequent processing, and (h) to remove contaminants
\r\nthat might chemically attack the surface?
\r\n28.2 Which of the following chemicals are associated with alkaline cleaning (two correct answers): (a)
\r\n28.3 In sand blasting, which one of the following blast media is used: (a) Al2O3, (b) crushed nut shells,
\r\n(c) nylon beads, (d) SiC, or (e) SiO2?borax, (b)
\r\n28.4 Which of the following processes generally produces a deeper penetration of atoms in the
\r\nimpregnated surface: (a) diffusion or (b) ion implantation?
\r\n28.5 Calorizing is the same as which one of the following surface processes: (a) aluminizing, (b) doping,
\r\n(c) hot sand blasting, or (d) siliconizing?
\r\n28.9 Which one of the following plate metals produces the hardest surface on a metallic substrate: (a)
\r\ncadmium, (b) chromium, (c) copper, (d) nickel, or (e) t28.3 In sand blasting, which one of the following blast media is used: (a) Al2O3, (b) crushed nut shells,
\r\n(c) nylon beads, (d) SiC, or (e) SiO2?
\r\n28.10 Which one of the following plating metals is associated with the term galvanizing: (a) iron, (b) lead,
\r\n(c) steel, (d) tin, or (e) zinc?
\r\n\r\n
28.11 Which of the following processes involves electrochemical reactions (two correct answers): (a)
\r\nanodizing, (b) chromate coatings, (c) electroless plating, (d) electroplating, and (e) phosphate
\r\ncoatings?
\r\n28.12 With which one of the following metals is anodizing most commonly associated (one answer): (a)
\r\naluminum, (b) magnesium, (c) steel, (d) titanium, or (e) zinc?
\r\n28.13 Sputtering is a form of which one of the following: (a) chemical vapor deposition, (b) defect in arc
\r\nwelding, (c) diffusion, (d) ion implantation, or (e) physical vapor deposition?
\r\n28.14 Which one of the following gases is the most commonly used in sputtering and ion plating: (a)
\r\nargon, (b) chlorine, (c) neon, (d) nitrogen, or (e) oxygen?
\r\n28.15 The principal methods of applying powder coatings are which of the following (two best answers):
\r\n(a) brushing, (b) electrostatic spraying, (c) fluidized bed, (d) immersion, and (e) roller coating?
\r\n28.16 Porcelain enamel is applied to a surface in which one of the following forms: (a) liquid emulsion,
\r\n(b) liquid solution, (c) molten liquid, or (d) powders?
\r\n28.17 Hard facing utilizes which one of the following basic processes: (a) arc welding, (b) brazing, (c) dip
\r\ncoating, (d) electroplating, or (e) mechanical deformation to work harden the surface?
\r\n
In porcelain enameling, what is frit?
The terms drying and curing have different meanings; indicate the distinction.
Describe the principal methods by which organic coatings are applied to a surface.
\r\n
What is meant by the term transfer efficiency in organic coating technology?
Identify the four major types of ingredients in organic coatings.
What are the two most common titanium compounds that are coated onto cutting tools by chemical
\r\nvapor deposition?
What are some of the advantages of chemical vapor deposition?
\r\n
Name the commonly used coating materials deposited by PVD onto cutting tools?
\r\n
What are some of the applications of PVD?
\r\n
What is the difference between physical vapor deposition (PVD) and chemical vapor deposition
\r\n(CVD)?
\r\n
What is physical vapor deposition?
How does anodizing differ from other conversion coatings?
\r\n
What is a conversion coating?
How does electroless plating differ from electrochemical plating?
\r\n
One of the mandrel types in electroforming is a solid mandrel. How is the part removed from a solid
\r\nmandrel?
What is the most commonly plated substrate metal?
What are the two basic mechanisms of corrosion protection?
\r\n
Identify the most common types of coating processes.
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