冷鍍鋅(xin)(xin)圓(yuan)管(guan)(guan)鋅(xin)(xin)層(ceng)(ceng)是電鍍層(ceng)(ceng)，鋅(xin)(xin)層(ceng)(ceng)與(yu)鋼管(guan)(guan)基(ji)體(ti)(ti)(ti)獨立分(fen)層(ceng)(ceng)。鋅(xin)(xin)層(ceng)(ceng)較(jiao)薄，鋅(xin)(xin)層(ceng)(ceng)簡單附著(zhu)在鋼管(guan)(guan)基(ji)體(ti)(ti)(ti)上，容(rong)易脫(tuo)落。故(gu)其(qi)耐腐(fu)蝕性能差。在新建住宅中，禁止(zhi)使(shi)用冷鍍鋅(xin)(xin)鋼管(guan)(guan)作為給水管(guan)(guan)。鋼管(guan)(guan)基(ji)體(ti)(ti)(ti)與(yu)熔融的(de)(de)鍍液發(fa)生復雜的(de)(de)物理、化學反(fan)應，形成耐腐(fu)蝕的(de)(de)結構緊密的(de)(de)鋅(xin)(xin)一鐵合(he)金層(ceng)(ceng)。合(he)金層(ceng)(ceng)與(yu)純(chun)鋅(xin)(xin)層(ceng)(ceng)、鋼管(guan)(guan)基(ji)體(ti)(ti)(ti)融為一體(ti)(ti)(ti)。故(gu)其(qi)耐腐(fu)蝕能力強。
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