Problem NO: 20

In a certain chemical blanking operation, a sulfuric acid etchant is used to remove material from a\nsheet of magnesium alloy. The sheet is 0.25 mm thi

In a certain chemical blanking operation, a sulfuric acid etchant is used to remove material from a

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sheet of magnesium alloy. The sheet is 0.25 mm thick. The screen resist method of masking was

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used to permit high production rates to be achieved. As it turns out, the process is producing a large

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proportion of scrap. Specified tolerances of ±0.025 mm are not being achieved. The foreman in the

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CHM department complains that there must be something wrong with the sulfuric acid. \"Perhaps

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the concentration is incorrect,\" he suggests. Analyze the problem and recommend a solution.

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