鍍鋅無縫鋼管鍍(du)(du)鋅(xin)量很少(shao),只(zhi)有10-50g/m2,其本身的耐腐蝕性比熱鍍(du)(du)鋅(xin)管(guan)(guan)(guan)相差很多(duo)。正規(gui)的鍍(du)(du)鋅(xin)管(guan)(guan)(guan)生產廠家,準用冷鍍(du)(du)鋅(xin)管(guan)(guan)(guan)作水、煤氣管(guan)(guan)(guan)。 冷鍍(du)(du)鋅(xin)鋼管(guan)(guan)(guan)鍍(du)(du)鋅(xin)層(ceng)(ceng)是(shi)電鍍(du)(du)層(ceng)(ceng),鋅(xin)層(ceng)(ceng)與鋼管(guan)(guan)(guan)基體獨立分層(ceng)(ceng)。鋅(xin)層(ceng)(ceng)較(jiao)薄(bo),鋅(xin)層(ceng)(ceng)簡單附著在鋼管(guan)(guan)(guan)基體上(shang),容易脫落。故其耐腐蝕性能差。在新建(jian)住宅(zhai)中(zhong),禁(jin)止使用冷鍍(du)(du)鋅(xin)鋼管(guan)(guan)(guan)作為給水鋼管(guan)(guan)(guan)。
酸洗后(hou),通過(guo)氯(lv)(lv)化銨(an)或 氯(lv)(lv)化鋅水溶(rong)液(ye)或氯(lv)(lv)化銨(an)和氯(lv)(lv)化鋅混合水溶(rong)液(ye)槽中進(jin)行清洗為(wei)了保(bao)證質(zhi)量,大(da)多不采用電鍍鋅(冷(leng)鍍)。
只有那些規模小、設(she)備陳舊的(de)小企(qi)業采用電鍍(du)(du)鋅(xin),當然他們的(de)價格(ge)也相對便(bian)宜一些。目前建設(she)部(bu)已正式下文,淘(tao)汰技術(shu)落(luo)后的(de)冷鍍(du)(du)鋅(xin)管,為了去除鋼管表面的(de)氧化(hua)鐵,,然后送入熱(re)浸鍍(du)(du)槽(cao)中。熱(re)鍍(du)(du)鋅(xin)具(ju)有鍍(du)(du)層均勻,附著(zhu)力強,使用壽命長等優點。