一、陰極電泳漆和陽極電泳漆的區別
電泳漆是一種水性防腐蝕烘烤漆。其涂布方式是通過直流電場使涂料泳至被涂工件上沉積成膜,主要用于車輛的底漆。電泳漆可以按照(zhao)其被涂工件的(de)電(dian)極(ji)的(de)不同,分為(wei)陰(yin)極(ji)電(dian)泳漆(qi)、陽極(ji)電(dian)泳漆(qi)兩種。那(nei)么(me)陰(yin)極(ji)電(dian)泳漆(qi)與(yu)陽極(ji)電(dian)泳漆(qi)有什(shen)么(me)區別(bie)呢(ni)?
陰極電(dian)泳(yong)漆和陽(yang)極電(dian)泳(yong)漆的(de)主要區別在于它們的(de)成膜聚合物類型、?應用(yong)領域、?以及電(dian)泳(yong)過(guo)程中的(de)特(te)性。?
1、成膜聚合物類型:?陽(yang)極(ji)電泳漆的(de)成(cheng)(cheng)(cheng)膜聚(ju)合物(wu)主(zhu)要是陰離子(zi)(zi)型樹(shu)脂,?通(tong)(tong)常含有多個(ge)羧基,?這些(xie)聚(ju)合物(wu)可以通(tong)(tong)過(guo)(guo)(guo)縮(suo)聚(ju)或共聚(ju)方式引入,?并用氨水、?無機堿(jian)或有機胺(an)等中和成(cheng)(cheng)(cheng)鹽,?共溶(rong)劑(ji)增溶(rong)而(er)成(cheng)(cheng)(cheng)水溶(rong)性(xing)。?在水中離解成(cheng)(cheng)(cheng)多陰離子(zi)(zi)聚(ju)合物(wu)。?陰極(ji)電泳漆的(de)成(cheng)(cheng)(cheng)膜物(wu)則是陽(yang)離子(zi)(zi)型樹(shu)脂,?通(tong)(tong)過(guo)(guo)(guo)向聚(ju)合物(wu)分子(zi)(zi)引入銨離子(zi)(zi)(?可通(tong)(tong)過(guo)(guo)(guo)環氧(yang)樹(shu)脂與各種(zhong)胺(an)反應,?經有機酸(suan)或無機酸(suan)中和而(er)得到)?而(er)成(cheng)(cheng)(cheng)水溶(rong)性(xing)。?
2、應用領域:?陽(yang)極電(dian)泳(yong)(yong)漆(qi)(qi)主要應(ying)用(yong)(yong)于鋁(lv)(lv)制品,?因為鋁(lv)(lv)材氧(yang)(yang)化后用(yong)(yong)陽(yang)極電(dian)泳(yong)(yong)漆(qi)(qi)保(bao)護,?其(qi)光(guang)澤度可以(yi)保(bao)持在(zai)50-90度之間,?且漆(qi)(qi)膜較薄,?因此在(zai)鋁(lv)(lv)型材行業上的(de)應(ying)用(yong)(yong)較廣泛。?陰極電(dian)泳(yong)(yong)漆(qi)(qi)則主要用(yong)(yong)于底(di)漆(qi)(qi),?由于其(qi)優越的(de)附著力和物理、?化學性質,?最宜用(yong)(yong)于底(di)漆(qi)(qi),?所以(yi)電(dian)泳(yong)(yong)漆(qi)(qi)中大(da)部分是由環氧(yang)(yang)樹脂衍生(sheng)物制成的(de)。?
3、電泳過程中的特性:?在(zai)陽(yang)極(ji)電泳(yong)過(guo)程中,?被涂(tu)金(jin)屬作為陽(yang)極(ji),?金(jin)屬及表(biao)面(mian)處(chu)理(li)膜(mo)(mo)(?如磷化(hua)層(ceng))?被溶出,?涂(tu)膜(mo)(mo)顏色加深而其物理(li)性(xing)(xing)能(neng)、?機(ji)械(xie)性(xing)(xing)能(neng)、?防腐性(xing)(xing)能(neng)下降。?陰極(ji)電泳(yong)時,?金(jin)屬底材及表(biao)面(mian)處(chu)理(li)膜(mo)(mo)不易(yi)離子(zi)化(hua),?故(gu)能(neng)得到更優良的防腐蝕效(xiao)果。?
二、陰極電泳漆和陽極電泳漆哪個好
陰極(ji)電泳漆(qi)(qi)是繼陽(yang)極(ji)電泳漆(qi)(qi)后,所誕生(sheng)的一種新產品,它(ta)相比于(yu)陽(yang)極(ji)電泳漆(qi)(qi)來(lai)說,具有比較多的優(you)勢:
1、陰極(ji)電泳(yong)漆(qi)的泳(yong)透力要(yao)比(bi)陽(yang)極(ji)電泳(yong)漆(qi)高出1.3-1.5倍,因此(ci)即使當陰極(ji)電泳(yong)加工(gong)(gong)復雜工(gong)(gong)件,內腔也可獲(huo)得很好的涂裝,可以有效(xiao)地省略(lve)輔助電極(ji),簡(jian)化了電泳(yong)涂裝工(gong)(gong)藝和材(cai)料消(xiao)耗(hao),減少(shao)成本。
2、陰極(ji)(ji)電(dian)泳漆(qi)的(de)耐(nai)(nai)腐(fu)蝕(shi)性(xing)好,其在(zai)脫脂鋼(gang)板(ban)上(shang)耐(nai)(nai)蝕(shi)時間超過了經磷(lin)化處理(li)的(de)陽(yang)極(ji)(ji)電(dian)泳漆(qi);同樣的(de)裸鋼(gang)板(ban)電(dian)泳一般是(shi)為(wei)陽(yang)極(ji)(ji)電(dian)泳漆(qi)的(de)3-4倍(bei)。而在(zai)鋅鹽磷(lin)化鋼(gang)板(ban)上(shang),其耐(nai)(nai)蝕(shi)性(xing)則(ze)為(wei)陽(yang)極(ji)(ji)電(dian)泳漆(qi)的(de)2-3倍(bei),在(zai)某些情況(kuang)下(xia)甚至還(huan)可(ke)以10倍(bei)之多(duo),其耐(nai)(nai)腐(fu)蝕(shi)性(xing)可(ke)以說是(shi)相當顯著的(de)。
3、根據(ju)相關的從(cong)實驗數據(ju)證明,陰(yin)極(ji)電泳(yong)(yong)(yong)漆的耐堿性相比(bi)于陽(yang)極(ji)電泳(yong)(yong)(yong)漆來說更高,其陰(yin)極(ji)電泳(yong)(yong)(yong)加工(gong)膜的的耐堿性(5%NaOH溶液)通常可以比(bi)陽(yang)極(ji)電泳(yong)(yong)(yong)漆膜高20-40倍。而且陰(yin)極(ji)電泳(yong)(yong)(yong)漆液比(bi)較穩定,容易控制,不(bu)似陽(yang)極(ji)電泳(yong)(yong)(yong)漆那么容易受雜質(zhi)離子和(he)微生物的影(ying)響而變(bian)質(zhi)。
由上述內容(rong)分(fen)析,可以(yi)發現,陰極電泳漆(qi)(qi)對比陽極電泳漆(qi)(qi)具有較多(duo)的優勢,特別是(shi)在泳透力、耐(nai)腐蝕性(xing)、耐(nai)堿性(xing)…等(deng)方面,因(yin)此大部分(fen)的用戶(hu)都會選擇陰極電泳漆(qi)(qi)來進行(xing)涂(tu)裝使用。