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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q515 - Gas Turbine Plants
84. Cadmium and zinc coatings provide which of the following type of protection for the base metal?
Cadmium and zinc coatings provide sacrificial protection by corroding preferentially, thereby preventing corrosion of the base metal. This occurs because cadmium and zinc are more anodic than steel in the galvanic series. Sealants physically block moisture, while thermal and chemical treatments do not offer this specific galvanic protection mechanism.
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