leoliou wrote:我覺得比較像是電位差腐蝕(鋁膠帶和不銹鋼管) 不是電位差腐蝕.https://www.pttweb.cc/bbs/FixMyHouse/M.1611194294.A.DA2有人沒貼鋁膠帶也是有粉末.