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With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.
With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.
A . Sulfide
B . Chloride
C . Iron sulfate
D . Iron oxide
Answer: C
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