Corrosion of mercury on different metals

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There are significant differences in the degree of corrosion caused by mercury on different metals: Aluminum and aluminum alloys: Mercury causes severe corrosion to aluminum and aluminum alloys; even low concentrations can lead to serious corrosion. If mercury is not removed in a timely manner from the aluminum alloy plate-fin heat exchanger (cold box) in natural gas processing units, it can lead to corrosion and perforations, resulting in gas leaks and shutdown of the unit. Nickel alloys: Mercury causes more severe corrosion in chromium-free nickel alloys (such as UNSN04400) compared to lower corrosion in chromium-containing nickel alloys3. Gold: Mercury also has a certain corrosive effect on gold, causing it to fade in color; however, when heated, mercury evaporates and the gold regains its original color. Carbon steel and galvanized sheet: Mercury vapor causes corrosion on carbon steel and galvanized sheet, but the degree of corrosion is relatively mild.