發(fā)布時(shí)間：2018-06-13 01:31

  本文選題：電刷鍍 + Ni-Mo合金�。� 參考：《聊城大學(xué)》2015年碩士論文

【摘要】：槽鍍Ni-Mo合金鍍層不僅具有較高的機(jī)械強(qiáng)度還具有優(yōu)良的耐磨性、耐蝕性和耐熱性,良好的Ni-Mo合金鍍層可以用以取代硬鉻鍍層從而減小對(duì)環(huán)境的污染。本文研制出了Ni-Mo合金刷鍍液并采用電刷鍍工藝方法在45#鋼基體表面成功制備出Ni-Mo合金刷鍍層,研究了鍍液組成和工藝參數(shù)對(duì)電刷鍍Ni-Mo合金鍍層表面形貌、顯微硬度及耐磨性的影響并分析了其原因;借助X射線衍射(XRD)、掃描電鏡(SEM)等材料分析方法,對(duì)不同工藝條件和鍍液配方下獲得的Ni-Mo合金刷鍍層的組織與結(jié)構(gòu)進(jìn)行分析研究,探究了Ni-Mo合金鍍層物理化學(xué)性能變化的規(guī)律。試驗(yàn)結(jié)果和理論分析表明:1、Ni-Mo合金刷鍍層呈晶態(tài),在結(jié)構(gòu)上是一個(gè)以Ni為溶劑,以Mo為溶質(zhì)的置換型固溶體,該鍍層與基體的結(jié)合強(qiáng)度較高且具有較高的顯微硬度和耐磨性,還具有一定的耐蝕性。2、在電刷鍍Ni-Mo合金工藝參數(shù)中,刷鍍工作電壓及電極相對(duì)運(yùn)動(dòng)速度對(duì)電刷鍍鍍層沉積速度、顯微硬度、表面形貌及耐磨性都有較明顯的影響,其中工作電壓對(duì)刷鍍鍍層性能影響最大。3、改變Ni-Mo合金刷鍍工藝參數(shù)可以細(xì)化鍍層結(jié)構(gòu),優(yōu)化Ni-Mo合金鍍層表面形貌,提高鍍層的硬度及耐磨性。在工作電壓14V,電極相對(duì)運(yùn)動(dòng)速度11.3m/min時(shí),刷鍍Ni-Mo合金鍍層的顯微硬度達(dá)到最大,所得鍍層晶粒細(xì)小,表面形貌均勻致密,且具有較高的耐磨性。4、隨著刷鍍液中硫酸鎳濃度的提高,Ni-Mo合金鍍層晶粒沿原子排列較密集的(111)晶面生長(zhǎng);刷鍍液中鉬酸鈉濃度的增加,有利于Ni-Mo合金鍍層晶粒沿原子排列較稀疏的(220)晶面生長(zhǎng)。5、Ni-Mo合金刷鍍液中硫酸鎳和鉬酸鈉濃度的增加,都能明顯提高鍍層的顯微硬度及耐磨性,但其強(qiáng)化機(jī)理不同:硫酸鎳濃度增加使晶粒細(xì)化;鉬酸鈉濃度增加使鍍層畸變位錯(cuò)增多。6、全面分析了Ni-Mo合金鍍液組成對(duì)鍍層表面形貌和鍍層性能的影響,優(yōu)選出電刷鍍Ni-Mo合金較為理想的鍍液配方。當(dāng)硫酸鎳濃度控制在400~500g/L,鉬酸鈉濃度控制在25~30g/L時(shí),Ni-Mo合金刷鍍層不僅具有良好的表面形貌且具有較高顯微硬度和耐磨性。
[Abstract]:The Ni-Mo alloy coating not only has high mechanical strength, but also has excellent wear resistance, corrosion resistance and heat resistance. A good Ni-Mo alloy coating can be used to replace the hard chromium coating and reduce the pollution to the environment. In this paper, Ni-Mo alloy brush plating bath was developed and Ni-Mo alloy brush coating was successfully prepared on the surface of 4steel substrate by the method of brush plating. The surface morphology of Ni-Mo alloy coating by bath composition and process parameters was studied. The effects of microhardness and wear resistance on the microstructure and structure of Ni-Mo alloy brush coatings obtained under different technological conditions and bath formulations were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The change of physical and chemical properties of Ni-Mo alloy coating was studied. The experimental results and theoretical analysis show that the Ni-Mo alloy brush coating is crystalline and is a replacement solid solution with Ni as solvent and Mo as solute in structure. The bonding strength between the coating and the substrate is high, and the coating has high microhardness and wear resistance. In the process parameters of brush plating Ni-Mo alloy, the working voltage of brush plating and the relative moving speed of electrode have obvious effects on deposition speed, microhardness, surface morphology and wear resistance of brush plating coating. The working voltage has the greatest influence on the performance of brush plating coating. Changing the technological parameters of Ni-Mo alloy brush plating can refine the coating structure, optimize the surface morphology of Ni-Mo alloy coating, and improve the hardness and wear resistance of the coating. When the working voltage is 14V and the relative speed of electrode is 11.3m/min, the microhardness of Ni-Mo alloy coating obtained by brush plating reaches the maximum, the grain size of the coating is fine and the surface morphology is uniform and compact. With the increase of nickel sulfate concentration in brush plating solution, the grain size of Ni-Mo alloy deposit grows along the crystal plane with dense atomic arrangement, and the concentration of sodium molybdate in brush plating solution increases. It is advantageous to increase the concentration of nickel sulfate and sodium molybdate in Ni-Mo alloy plating solution by increasing the grain size of Ni-Mo alloy coating along the sparsely arranged crystal plane of Ni 220), which can obviously improve the microhardness and wear resistance of the coating. However, the strengthening mechanism is different: the increase of nickel sulfate concentration makes the grain refinement, and the increase of sodium molybdate concentration leads to the increase of dislocations of the coating. The effect of the composition of Ni-Mo alloy plating bath on the surface morphology and coating properties is analyzed. An ideal solution formula for brush plating of Ni-Mo alloy was selected. When the concentration of nickel sulfate is controlled at 400g / L and sodium molybdate concentration is controlled at 2530g / L, the Ni-Mo alloy brush coating not only has good surface morphology, but also has high microhardness and wear resistance.
【學(xué)位授予單位】：聊城大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ153.2

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本文編號(hào)：2012023