Which types of metals are most susceptible to galvanic corrosion in marine environments?

The correct choice identifies aluminum and copper as metals that are particularly susceptible to galvanic corrosion in marine environments. This susceptibility arises from their positions in the galvanic series, where aluminum is more anodic (more likely to corrode) compared to copper, which is more cathodic. When these two dissimilar metals are electrically connected in an electrolyte, such as seawater, a galvanic cell is formed, leading to accelerated corrosion of the aluminum.

In a marine setting, where the presence of saltwater enhances conductivity, this corrosion process can be quite severe. The potential difference created between aluminum and copper leads to significant corrosion of the more anodic aluminum, impacting its structural integrity over time. Therefore, any electrochemical related considerations in marine engineering and vessel maintenance must regard aluminum and copper combinations with particular caution.

Other combinations, such as steel and iron or bronze and stainless steel, generally exhibit different behavior regarding corrosion, and lead and plastic do not demonstrate the same level of galvanic interaction as metals. Understanding these dynamics is crucial for preventing and managing corrosion in marine applications.