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id="vatvcu7" class="box"><p><p style="text-indent:25px">化學(xué)鍍鎳置換鍍（離子交換或電荷交換沉積）：；一種金屬浸在第二種金屬的金屬鹽溶液中，第1種金屬的表面上發(fā)生局部溶解，同時(shí)在其表面自發(fā)沉積上第二種金屬，鋁合金化學(xué)鎳鍍層。在離子交換情況下，基底金屬本身就是還原劑。；使用普遍化學(xué)鍍鎳的基底金屬（Me1）是銅、鐵和鎳，而用得多的鍍層金屬（Me2）則是金和銅。如將一只鐵釘浸在硫酸銅溶液中，鋁合金化學(xué)鎳鍍層，鋁合金化學(xué)鎳鍍層，鐵釘上就鍍上薄薄一層銅。但它的實(shí)際應(yīng)用是有限的，因?yàn)榛捉饘俚谋砻嬉坏┍蝗芤褐械慕饘伲∕e2）覆蓋，過(guò)程馬上停止。所以其大厚度是很小的，而且結(jié)合力沒(méi)有真正的化學(xué)鍍那么好。由于鍍層質(zhì)量差，厚度有限，所以應(yīng)用非常有限。在大氣中以及在其他介質(zhì)中，化學(xué)鍍鎳層的化學(xué)穩(wěn)定性高于電鍍鎳層的化學(xué)穩(wěn)定性。鋁合金化學(xué)鎳鍍層</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="鋁合金化學(xué)鎳鍍層,化學(xué)鍍鎳代加工" src="https://tyunfile.71360.com/UploadFile/szztjs/637447648368218123/4308054.png"></div><p style="text-indent:25px">化學(xué)鍍鎳的沉積速度受溫度、pH值、鍍液組成和添加劑的影響。通常溫度上升，沉積速度也上升。每上升10℃，速度約提高2倍。pH值是重要的因素，對(duì)反應(yīng)速度、還原劑的利用率、鍍層的性質(zhì)都有很大的影響。鎳鹽濃度的影響不是很主要的，次亞磷酸鈉的濃度提高，速度也會(huì)相應(yīng)提高，但是到了一定限度以后反而會(huì)使速率下降。每還原lmol的鎳，需消耗3mol的次磷酸鹽(即1g鍍層消耗5.4g的次亞磷酸鈉)。同時(shí)，一部分次亞磷酸鹽在鎳表面催化分解。常常以利用系數(shù)來(lái)評(píng)定次亞磷酸鹽的消耗效率。裝飾品化學(xué)鍍鎳代加工廠(chǎng)化學(xué)鍍鎳適合于管狀或外形復(fù)雜的小零件的光亮鍍鎳，不必再經(jīng)拋光。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="鋁合金化學(xué)鎳鍍層,化學(xué)鍍鎳代加工" src="https://tyunfile.71360.com/UploadFile/szztjs/637447648462622414/1530565.png"></div><p style="text-indent:25px">航空航天工業(yè)為化學(xué)鍍鎳的使用大戶(hù)之一，原因是：一種高磷，壓應(yīng)力的化學(xué)鍍鎳技術(shù)用于修復(fù)JT8D六種型號(hào)的噴氣發(fā)動(dòng)機(jī)的葉輪，確保了這種發(fā)動(dòng)機(jī)的重新使用。在航空發(fā)動(dòng)機(jī)的渦輪機(jī)或壓縮機(jī)的葉片上，通常鎳磷合金化學(xué)鍍厚為25～75um，以防止燃?xì)飧g，其疲勞強(qiáng)度的降低比電鍍鉻少25%。采用超厚層化學(xué)鍍鎳修復(fù)飛機(jī)零件，鍍厚達(dá)275～750um。原采用電鍍工藝時(shí)的返工率達(dá)50%，采用化學(xué)鍍鎳后合格率達(dá)90%以上，可見(jiàn)取得了明顯的經(jīng)濟(jì)效益。飛機(jī)上的輔助發(fā)電機(jī)（APU）經(jīng)化學(xué)鍍鎳后，其壽命提高3～4倍。重達(dá)8.2噸的渦輪發(fā)動(dòng)機(jī)的主軸承面經(jīng)化學(xué)鍍鎳100um，以防止開(kāi)機(jī)和停機(jī)所引起的振動(dòng)損壞。</p><p style="text-indent:25px">化學(xué)鍍?cè)O(shè)備簡(jiǎn)單，不需要電源及陽(yáng)極，只要在溫度、pH值工藝參數(shù)合理的條件下，把待鍍零件浸入在鍍液中即可?；瘜W(xué)鍍的結(jié)合力、防腐性能都優(yōu)于電鍍。某些化學(xué)鍍層還有特殊的物理化學(xué)性能。硬度高，耐磨性好，化學(xué)鍍鎳層熱處理后硬度達(dá)Hv1100，工模具鍍鎳后一般壽命提高3倍以上。耐腐蝕強(qiáng)，化學(xué)鍍鎳層在酸、堿、鹽、氨和海水等介質(zhì)中都具有很好的耐腐蝕性，其耐腐蝕性勝于不銹鋼?；瘜W(xué)鍍包括鍍鎳、鍍銅、鍍金、鍍錫等很多鍍種，但應(yīng)用范圍廣的還是化學(xué)鍍鎳。用化學(xué)鍍鎳沉積的鍍層，有一些不同于電沉積層的特性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="鋁合金化學(xué)鎳鍍層,化學(xué)鍍鎳代加工" src="https://tyunfile.71360.com/UploadFile/szztjs/637447648654546226/9539678.png"></div><p style="text-indent:25px">化學(xué)鍍鎳的技術(shù)特性及作用:1、耐腐蝕性強(qiáng)：該工藝處理后的金屬表面為非晶態(tài)鍍層，抗腐蝕性特別優(yōu)良，經(jīng)硫酸、鹽酸、燒堿、鹽水同比試驗(yàn)，其腐蝕速率低于1cr18Ni9Ti不銹鋼。2、耐磨性好：由于催化處理后的表面為非晶態(tài)，即處于基本平面狀態(tài)，有自潤(rùn)滑性。因此，摩擦系數(shù)小，非粘著性好，耐磨性能高，在潤(rùn)滑情況下，可替代硬鉻使用。3、光澤度高：催化后的鍍件表面光澤度為L(zhǎng)Z或▽8-10可與不銹鋼制品媲美，呈白亮不銹鋼顏色。工件鍍膜后，表面光潔度不受影響，無(wú)需再加工和拋光?；瘜W(xué)鍍鎳是用還原劑把溶液中的鎳離子還原沉積在具有催化活性的表面上。鋁合金化學(xué)鎳鍍層</p><p style="text-indent:25px">用化學(xué)鍍鎳沉積的鍍層：化學(xué)穩(wěn)定性高、鍍層結(jié)合力好。鋁合金化學(xué)鎳鍍層</p><p style="text-indent:25px">化學(xué)鍍鎳的技術(shù)特性及作用:表面硬度高：經(jīng)本技術(shù)處理后，金屬表面硬度可提高一倍以上，在鋼鐵及銅表面可達(dá)Hv570。鍍層經(jīng)熱處理后硬度達(dá)Hv1000，工模具鍍膜后一般壽命提高3倍以上。結(jié)合強(qiáng)度大：本技術(shù)處理后的合金層與金屬基件結(jié)合強(qiáng)度增大，一般在350-400Mpa條件下不起皮、不脫落、無(wú)氣泡，與鋁的結(jié)合強(qiáng)度可達(dá)102-241Mpa。仿型性好：在尖角或邊緣突出部分，沒(méi)有過(guò)份明顯的增厚，即有很好的仿型性，鍍后不需磨削加工，沉積層的厚度和成份均勻。工藝技術(shù)高適應(yīng)性強(qiáng)：在盲孔、深孔、管件、拐角、縫隙的內(nèi)表面可得到均勻鍍層，所以無(wú)論您的產(chǎn)品結(jié)構(gòu)有多么復(fù)雜，本技術(shù)處理起來(lái)均能得心應(yīng)手，絕無(wú)漏鍍之處。低電阻，可焊性好。耐高溫：該催化合金層熔點(diǎn)為850-890度。鋁合金化學(xué)鎳鍍層</p><p style="text-indent:25px">蘇州展圖金屬科技有限公司致力于化工，是一家生產(chǎn)型公司。公司自成立以來(lái)，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下化學(xué)鍍鎳加工，鍍鎳磷合金，無(wú)電解鍍鎳，鎂合金化學(xué)鍍鎳深受客戶(hù)的喜愛(ài)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠(chéng)信為本的理念，打造化工良好品牌。蘇州展圖立足于全國(guó)市場(chǎng)，依托強(qiáng)大的研發(fā)實(shí)力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶(hù)的變化需求。</p></p><br /><p>文章來(lái)源地址: http://m.cdcfah.com/cp/3195890.html</p></div></div></div></div></div><div id="quwtace" class="page-right twoColRt"><div 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