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Dissimilar metals refer to two different types of metals that have varying electrochemical properties. When dissimilar metals come into contact with each other in the presence of an electrolyte, such as water, galvanic corrosion can occur. This happens because one metal may corrode faster than the other, leading to structural and material degradation.
The true statement regarding dissimilar metals is that they promote corrosion and should not be joined. This is critical in the context of underground storage tanks (USTs), where the materials need to be carefully selected to avoid any potential for corrosion that can lead to leaks or failures.
Choosing materials that are compatible and reducing the risk of galvanic corrosion is essential for the integrity and safety of underground tanks. Understanding this concept helps ensure that UST installations prioritize material compatibility and longevity.