【摘要】：不銹鋼的硬度低,耐磨性差,摩擦因數(shù)大,易發(fā)生局部損傷和表面鈍化膜受損而導(dǎo)致的局部腐蝕。為了提高不銹鋼的綜合性能,常對(duì)其進(jìn)行表面處理。其中化學(xué)鍍成本低廉、均鍍以及深鍍能力好。鐵鋅合金作為一種防護(hù)性鍍層具有優(yōu)異的軟磁性能和良好的耐蝕性及電催化性,同時(shí)合金成分使基體材料產(chǎn)生一些電鍍產(chǎn)品不具備的物理化學(xué)性能,例如化學(xué)鍍金等到的鍍層使基體的耐磨性和可焊性得到提高,因此在電子元器件以及光學(xué)元件中有廣泛的應(yīng)用。近年來有關(guān)化學(xué)鍍Fe-Zn合金的研究較少。本文用化學(xué)鍍的方法在不銹鋼基體上施鍍Fe-Zn二元合金鍍層,采用正交試驗(yàn)法和單因素變量法研究鍍液中各成分和施鍍溫度的變化對(duì)鍍層沉積速率的影響,并運(yùn)用顯微硬度計(jì)、SEM等技術(shù)研究了沉積工藝條件對(duì)鍍層的硬度、耐腐蝕性能和鍍層形貌的影響。試驗(yàn)結(jié)果顯示,在研究鍍液成分時(shí),對(duì)于不同的鍍液成分Fe-Zn合金鍍速大小為:ZnSO_4·7H_2OC_4H_4O_6KNa·4H_2OFeSO_4·7H_2ONaH_2PO_2·H_2O。鍍速的大小主要是和鍍液中Zn~(2-)濃度成正比。鍍層耐腐蝕性能的研究結(jié)果顯示:鍍液成分中的ZnSO_4·7H_2O,FeSO_4·7H_2O對(duì)耐腐蝕性影響較大。對(duì)鍍層硬度的研究表明,鍍液成分對(duì)鍍層硬度大小的影響為:FeSO_4·7H_2ONaH_2PO_2·H_2OC_4H_4O_6KNa·4H_2OZnSO_4·7H_2O。從而看出鍍液中的Fe2+對(duì)鍍層硬度大小有很大的影響。同等條件下,化學(xué)實(shí)驗(yàn)的其他條件不變,隨著化學(xué)溫度的升高,化學(xué)鍍Fe-Zn合金沉積速率和顯微硬度都是先增大后減小。研究結(jié)果顯示進(jìn)行化學(xué)鍍Fe-Zn合金鍍層:施鍍溫度為55℃,光亮劑1g/L,C_4H_4O_6KNa·4H_2O 67g/L,NaOH 35g/L,Zn SO_4·7H_2O 7g/L,FeSO_4·7H_2O 8g/L,H_3BO_3 1g/L,NaH_2PO2·H_2O 9g/L。在最佳工藝條件下,化學(xué)鍍Fe-Zn合金的鍍速和鍍層的維氏硬度值分別達(dá)到最大值5.46 mg/(cm2·h)和534HV。鍍層掃描電鏡分析表明,鍍層顆粒大小均勻,排列緊密。能譜儀分析出鍍層中鋅含量為14.83!,鐵含量為85.17!,不含其他雜質(zhì)。
[Abstract]:Stainless steel has low hardness, poor wear resistance, high friction coefficient and local corrosion caused by local damage and surface passivation film damage. In order to improve the comprehensive properties of stainless steel, surface treatment is often carried out. The cost of electroless plating is low, and the ability of uniform plating and deep plating is good. As a kind of protective coating, Fe-Zn alloy has excellent soft magnetic properties, good corrosion resistance and electrocatalysis, and the alloy composition makes the matrix material produce some physical and chemical properties that the electroplating products do not possess. For example, electroless gold plating can improve the wearability and solderability of the substrate, so it is widely used in electronic components and optical components. In recent years, there are few studies on electroless Fe-Zn alloy plating. In this paper, Fe-Zn binary alloy coating was deposited on stainless steel substrate by electroless plating method. The effects of composition and temperature of plating bath on deposition rate were studied by orthogonal test and single factor variable method. The effect of deposition conditions on the hardness, corrosion resistance and morphology of the coating was studied by means of microhardness tester SEM and so on. The results show that the plating rate of Fe-Zn alloy with different bath composition is 1: ZnSO4 7H_2OC_4H_4O_6KNa 4H_2OFeSO_4 7H_2ONaH_2PO_2 H _ 2O _ 2 when the bath composition is studied. The rate of plating is mainly proportional to the concentration of Zn ~ (2 -) in the bath. The corrosion resistance of the coating is studied. The results show that ZnSO_4 7H _ 2O _ 2O _ 2O _ 4 7H_2O in the bath has a great effect on the corrosion resistance. The study on the hardness of the coating shows that the effect of the composition of the plating bath on the hardness of the coating is as follows: 1 FeSO4 7H_2ONaH_2PO_2 H_2OC_4H_4O_6KNa 4H_2OZnSO_4 7H _ 2O _ 2. It is shown that the Fe2 in the plating bath has a great influence on the hardness of the coating. Under the same conditions and other conditions of chemical experiment, the deposition rate and microhardness of electroless Fe-Zn alloy increase first and then decrease with the increase of chemical temperature. The results showed that electroless Fe-Zn alloy coating was deposited at 55 鈩，

本文編號(hào)：2183927