The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
Correct answer: A. 0%
- A. 0%
- B. 2 to 3%
- C. 5 to 10%
- D. <1%
Explanation
The intended classification describes a highly corrosion-resistant cast alloy, for which tarnish and corrosion are considered negligible, approximately 0%. Vickers hardness alone does not normally calculate a corrosion percentage, but under the stated classification the listed answer is the expected one.
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