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Answers to college chemistry experiments
1, indicating the corrosion inhibition mechanism of butynol and the reason of poor corrosion inhibition effect at low temperature.

A: The corrosion mechanism of butynol is to form "mesophase" on the metal surface, which plays a role in corrosion inhibition and protects the metal. When the temperature is too low, the reaction is not easy to complete, and it is not easy to generate "intermediate phase", so the corrosion inhibition effect is poor.

2. Explain how the smoothness of the specimen affects the corrosion rate.

Answer: The test piece is not smooth, and there are many impurities (such as iron oxide) on the surface. The acid will react with the specimen first, and then react with the specimen after the reaction is completed, thus prolonging the corrosion time and slowing down the corrosion rate of the acid to the specimen.

3. Compare the inhibition effects of three kinds of corrosion inhibitors and explain the reasons.

A: When a single corrosion inhibitor is added, the corrosion inhibition effect of butynol is obviously better than that of formaldehyde, and its corrosion inhibition rate is doubled. When two kinds of corrosion inhibitors are added, the corrosion inhibition effect is obviously improved, because the composite "mesophase" formed after adding two kinds of corrosion inhibitors has better corrosion inhibition effect.

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