▁made ▁from ▁z inc ▁to ▁the ▁pipe . ▁Z inc ▁acts ▁as ▁the ▁an ode ▁( negative ▁termin us ) ▁by ▁slowly ▁cor rod ing ▁away ▁as ▁it ▁passes ▁electric ▁current ▁to ▁the ▁steel ▁pipeline . ▁Z inc ▁is ▁also ▁used ▁to ▁c ath od ically ▁protect ▁met als ▁that ▁are ▁exposed ▁to ▁sea ▁water ▁from ▁cor ros ion . ▁Z inc ▁is ▁also ▁used ▁as ▁an ▁an ode ▁material ▁for ▁batter ies ▁such ▁as ▁in ▁z inc – car bon ▁batter ies ▁or ▁z inc - air ▁battery / f uel ▁cells . ▁A ▁widely ▁used ▁al loy ▁which ▁contains ▁z inc ▁is ▁br ass , ▁in ▁which ▁co pper ▁is ▁al loy ed ▁with ▁anywhere ▁from ▁ 3 % ▁to ▁ 4 5 % ▁z inc , ▁depending ▁upon ▁the ▁type ▁of ▁br ass . ▁Br ass ▁is ▁generally ▁more ▁du ct ile ▁and ▁stronger ▁than ▁co pper ▁and ▁has ▁superior ▁cor ros ion ▁resistance . ▁These ▁properties ▁make ▁it ▁useful ▁in ▁communication ▁equipment , ▁hardware , ▁musical ▁instruments , ▁and ▁water ▁val ves . ▁Other ▁widely ▁used ▁allo ys ▁that ▁contain ▁z inc ▁include ▁nick el ▁silver , ▁type writer ▁metal , ▁soft ▁and ▁al umin ium ▁sol der , ▁and ▁commercial ▁bronze . ▁Al lo ys ▁of ▁primarily ▁z inc ▁with ▁small ▁amounts ▁of ▁co pper , ▁al umin ium , ▁and ▁mag nes ium ▁are ▁useful ▁in ▁die ▁casting ▁as ▁well ▁as ▁spin ▁casting , ▁especially ▁in ▁the ▁autom ot ive , ▁elect rical , ▁and ▁hardware ▁indust