Due to the electrical potential difference that develops when two dissimilar metals or alloys are connected together in an aqueous solution, the base metal will become anodic ... Similar to other ...

Galvanic corrosion may occur when two dissimilar metals are in contact with one another in the presence of an electrolyte creating an electronic pathway for the movement of electrons (such as water).

Most have aluminum fittings. When you attach the hose to a brass faucet (bib if you prefer; I say faucet), galvanic corrosion happens. Leave the hose attached long enough and no matter what size ...