Is it true that zinc may experience a reversal of polarity at temperatures above 54°C in the presence of acids, bases, and other substances, resulting in the loss of its cathodic protection function?
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One theory suggests that zinc may experience a reversal of polarity at temperatures above 54°C in the presence of substances such as acids and bases, resulting in it losing its cathodic protection function. Is this true? If this is true, does it occur in some insulated storage tanks (such as those for crude oil, heavy oil, residue, etc.)?
At a certain temperature, iron is more reactive than zinc
For example, with these heat tracing pipes surrounding the storage tanks, whose temperature is around 80 degrees, isn’t corrosion more likely to occur? ? ?
The reactivity of zinc and iron changes with temperature. At low temperatures, zinc is more reactive than iron; zinc protects iron ； At high temperatures, iron is more reactive than zinc, and iron protects zinc. As the metal composition changes, iron protects zinc and iron corrodes preferentially even below 60°C. In principle, it should happen