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13919191819热(Re)镀(Du)锌(Xin)钢(Gang)管(Guan)是(Shi)使(Shi)熔(Rong)融(Rong)金(Jin)属(Shu)与(Yu)铁(Tie)基(Ji)体(Ti)反(Fan)应(Ying)而(?)产(Chan)生(Sheng)合(He)金(Jin)层(Ceng),(?)从(Cong)而(?)使(Shi)基(Ji)体(Ti)和(He)镀(Du)层(Ceng)二(?)者(Zhe)相(Xiang)结(Jie)合(He)。(?)热(Re)镀(Du)锌(Xin)是(Shi)先(Xian)将(Jiang)钢(Gang)管(Guan)进(Jin)行(Xing)酸(Suan)洗(Xi),(?)为(Wei)了(Liao)去(Qu)除(Chu)钢(Gang)管(Guan)表(Biao)面(Mian)的(De)氧(Yang)化(Hua)铁(Tie),(?)酸(Suan)洗(Xi)后(Hou),(?)通(Tong)过(Guo)氯(Lu)化(Hua)铵(An)或(Huo)氯(Lu)化(Hua)锌(Xin)水(Shui)溶(Rong)液(Ye)或(Huo)氯(Lu)化(Hua)铵(An)和(He)氯(Lu)化(Hua)锌(Xin)混(Hun)合(He)水(Shui)溶(Rong)液(Ye)槽(Cao)中(Zhong)进(Jin)行(Xing)清(Qing)洗(Xi),(?)然(Ran)后(Hou)送(Song)入(Ru)热(Re)浸(Jin)镀(Du)槽(Cao)中(Zhong)。(?)热(Re)镀(Du)锌(Xin)具(Ju)有(You)镀(Du)层(Ceng)均(Jun)匀(Yun),(?)附(Fu)着(Zhuo)力(Li)强(Qiang),(?)使(Shi)用(Yong)寿(Shou)命(Ming)长(Chang)等(Deng)优(You)点(Dian)。(?)钢(Gang)管(Guan)基(Ji)体(Ti)与(Yu)熔(Rong)融(Rong)的(De)镀(Du)液(Ye)发(Fa)生(Sheng)复(Fu)杂(Za)的(De)物(Wu)理(Li)、(?)化(Hua)学(Xue)反(Fan)应(Ying),(?)形(Xing)成(Cheng)耐(Nai)腐(Fu)蚀(Shi)的(De)结(Jie)构(Gou)紧(Jin)密(Mi)的(De)锌(Xin)一(Yi)铁(Tie)合(He)金(Jin)层(Ceng)。(?)合(He)金(Jin)层(Ceng)与(Yu)纯(Chun)锌(Xin)层(Ceng)、(?)钢(Gang)管(Guan)基(Ji)体(Ti)融(Rong)为(Wei)一(Yi)体(Ti)。(?)故(Gu)其(Qi)耐(Nai)腐(Fu)蚀(Shi)能(Neng)力(Li)强(Qiang)。(?)
冷(Leng)镀(Du)锌(Xin)钢(Gang)管(Guan)就(Jiu)是(Shi)电(Dian)镀(Du)锌(Xin),(?)镀(Du)锌(Xin)量(Liang)很(Hen)少(Shao),(?)只(Zhi)有(You)10-50g/m2,(?)其(Qi)本(Ben)身(Shen)的(De)耐(Nai)腐(Fu)蚀(Shi)性(Xing)比(Bi)热(Re)镀(Du)锌(Xin)管(Guan)相(Xiang)差(Cha)很(Hen)多(Duo)。(?)正(Zheng)规(Gui)的(De)镀(Du)锌(Xin)管(Guan)生(Sheng)产(Chan)厂(Chang)家(Jia),(?)为(Wei)了(Liao)保(Bao)证(Zheng)质(Zhi)量(Liang),(?)大(Da)多(Duo)不(Bu)采(Cai)用(Yong)电(Dian)镀(Du)锌(Xin)(冷(Leng)镀(Du))。(?)只(Zhi)有(You)那(Na)些(Xie)规(Gui)模(Mo)小(Xiao)、(?)设(She)备(Bei)陈(Chen)旧(Jiu)的(De)小(Xiao)企(Qi)业(Ye)采(Cai)用(Yong)电(Dian)镀(Du)锌(Xin),(?)当(Dang)然(Ran)他(Ta)们(Men)的(De)价(Jia)格(Ge)也(Ye)相(Xiang)对(Dui)便(Bian)宜(Yi)一(Yi)些(Xie)。(?)
目(Mu)前(Qian)建(Jian)设(She)部(Bu)已(Yi)正(Zheng)式(Shi)下(Xia)文(Wen),(?)淘(Tao)汰(Tai)技(Ji)术(Shu)落(Luo)后(Hou)的(De)冷(Leng)镀(Du)锌(Xin)管(Guan),(?)今(Jin)后(Hou)不(Bu)准(Zhun)用(Yong)冷(Leng)镀(Du)锌(Xin)管(Guan)作(Zuo)水(Shui)、(?)煤(Mei)气(Qi)管(Guan)。(?)锌(Xin)层(Ceng)是(Shi)电(Dian)镀(Du)层(Ceng),(?)锌(Xin)层(Ceng)与(Yu)钢(Gang)管(Guan)基(Ji)体(Ti)独(Du)立(Li)分(Fen)层(Ceng)。(?)锌(Xin)层(Ceng)较(Jiao)薄(Bao),(?)锌(Xin)层(Ceng)简(Jian)单(Dan)附(Fu)着(Zhuo)在(Zai)钢(Gang)管(Guan)基(Ji)体(Ti)上(Shang),(?)容(Rong)易(Yi)脱(Tuo)落(Luo)。(?)故(Gu)其(Qi)耐(Nai)腐(Fu)蚀(Shi)性(Xing)能(Neng)差(Cha)。(?)在(Zai)新(Xin)建(Jian)住(Zhu)宅(Zhai)中(Zhong),(?)禁(Jin)止(Zhi)使(Shi)用(Yong)冷(Leng)镀(Du)锌(Xin)钢(Gang)管(Guan)作(Zuo)为(Wei)给(Gei)水(Shui)管(Guan)。(?)
1、(?)镀(Du)锌(Xin)层(Ceng)的(De)均(Jun)匀(Yun)性(Xing):(?)钢(Gang)管(Guan)试(Shi)样(Yang)在(Zai)硫(Liu)酸(Suan)铜(Tong)溶(Rong)液(Ye)中(Zhong)连(Lian)续(Xu)浸(Jin)渍(Zi)5次(Ci)不(Bu)得(De)变(Bian)红(Hong)(镀(Du)铜(Tong)色(Se))
2、(?)表(Biao)面(Mian)质(Zhi)量(Liang):(?)镀(Du)锌(Xin)钢(Gang)管(Guan)的(De)表(Biao)面(Mian)应(Ying)有(You)完(Wan)整(Zheng)的(De)镀(Du)锌(Xin)层(Ceng),(?)不(Bu)得(De)有(You)未(Wei)镀(Du)上(Shang)的(De)黑(Hei)斑(Ban)和(He)气(Qi)泡(Pao)存(Cun)在(Zai),(?)允(Yun)许(Xu)有(You)不(Bu)大(Da)的(De)粗(Cu)糙(Cao)面(Mian)和(He)局(Ju)部(Bu)锌(Xin)瘤(Liu)存(Cun)在(Zai)。(?)
3、(?)镀(Du)锌(Xin)层(Ceng)重(Zhong)量(Liang):(?)根(Gen)据(Ju)需(Xu)方(Fang)要(Yao)求(Qiu),(?)镀(Du)锌(Xin)钢(Gang)管(Guan)可(Ke)作(Zuo)锌(Xin)层(Ceng)重(Zhong)量(Liang)测(Ce)定(Ding),(?)其(Qi)平(Ping)均(Jun)值(Zhi)应(Ying)不(Bu)小(Xiao)于(Yu)500g/平(Ping)方(Fang)米(Mi),(?)其(Qi)中(Zhong)任(Ren)何(He)试(Shi)样(Yang)不(Bu)得(De)小(Xiao)于(Yu)480g/平(Ping)方(Fang)米(Mi)。(?)
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