Explain the two-step coloring procedure of aluminum that involves electrolytic coloring.
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There is an aluminum coloring procedure that involves a two-step electrolytic coloring process. After aluminum is anodized, it is immersed in a bath containing an inorganic metal salt and subjected to an electric current that deposits the metal salt at the base of the pores. Color depends on the metal salt used (for example, tin, copper, nickel, cobalt). This method provides the greatest variation of colors.
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Why is it important to grind the ends of a crack to a featheredge?? ?
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In order to modulate the flow of supply air, VAV systems may use inlet guide vanes on the fan inlet or _____
a. hot gas bypass b. an economizer c. variable speed drives d. powered exhaust