"something prone to corrosion" Prone to acidic corrosion. Freshly machined stainless steel will rust unless its passivated in an acidic dip, you couldda chrom

"something prone to corrosion" Prone to acidic corrosion. Freshly machined stainless steel will rust unless its passivated in an acidic dip, you couldda chrome plated it but dissolving off everything not chrome ends up in about the same place. Another good one is aluminum as in aluminum nails, pre 1980s house siding was aluminum for decades before it switched to short life vinyl siding, and aluminum is mostly impervious to acids and reacts very strongly to alkali. Technically pure aluminum will melt away in either, but the oxide coating is stable in acids and dissolves in bases, so in practice aluminum is acid proof and alkali melts right thru it.