本文關(guān)鍵詞：納米粒子改性鎳鈷電鍍層的制備及性能研究　出處：《北京化工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 納米復(fù)合鍍 工藝參數(shù) 氧化釔 氧化鋯 機(jī)械性能

【摘要】：復(fù)合鍍技術(shù)一直受到大家的青睞,它是一種有效的可以將合金與高硬度的陶瓷顆粒實(shí)現(xiàn)共沉積的表面改性技術(shù),在保持原合金鍍層優(yōu)良性能的基礎(chǔ)上,進(jìn)一步提高鍍層的物理、化學(xué)等機(jī)械性能,以便應(yīng)對各種各樣惡劣的使用環(huán)境。納米粒子具有一系列的優(yōu)良特性,將其摻雜進(jìn)入鍍層,會(huì)給復(fù)合鍍層綜合性能帶來更大的提升空間,這將是未來研究的一個(gè)熱點(diǎn)。本文是將納米氧化物Y_2O_3和ZrO_2加入到Ni-Co合金鍍層中,實(shí)現(xiàn)粒子與金屬的共沉積。主要探究了工藝條件的改變對鍍層基本性能的影響規(guī)律,探討了納米稀土粒子的加入對Ni-Co合金鍍層的微觀結(jié)構(gòu)、機(jī)械性能和影響機(jī)制。本文主要研究了表面活性劑種類、pH值、稀土粒子的加入量以及電沉積時(shí)電流密度等因素對復(fù)合鍍層表面形貌、鍍層中粒子的含量、結(jié)構(gòu)晶粒度以及鍍層的硬度等性能的影響規(guī)律,獲得了優(yōu)化的Ni-Co/Y_2O_3和Ni-Co/ZrO_2納米復(fù)合鍍層制備工藝。主要結(jié)果如下：(1)Ni-Co/Y_2O_3復(fù)合鍍層優(yōu)化工藝：鍍液中氨基磺酸鎳,300 g/L；氨基磺酸鈷,13.7 g/L；氯化鎳,6 g/L；硼酸,30 g/L；十二烷基硫酸鈉,0.05g/L；納米Y_2O_3粒子,15 g/L；鍍液pH值為4.0。沉積電流密度i=1.0A/dm~2,電沉積溫度為45℃,沉積時(shí)間30 min。(2)Ni-Co/ZrO_2納米復(fù)合鍍層優(yōu)化工藝：鍍液中氨基磺酸鎳,300 g/L；氨基磺酸鈷,13.7 g/L；氯化鎳,6 g/L；硼酸,30 g/L；十二烷基硫酸鈉,0.05 g/L;納米ZrO_2粒子,15g/L;鍍液pH值為5.0。沉積電流密度i=2.0A/dm~2,電沉積溫度為45℃,沉積時(shí)間30 min。(3)在優(yōu)化的工藝條件下,分別制備Ni-Co/Y_2O_3和Ni-Co/ZrO_2納米復(fù)合鍍層,Y元素和Zr元素的摻入量分別為6.00%和4.08%。由于納米粒子的加入,Ni-Co基復(fù)合鍍層的晶粒得到了細(xì)化合金,其硬度也有較大的提高,其顯微硬度值由349.24 HV分別提升為467.23 HV和550 HV,鍍層和基體的結(jié)合強(qiáng)度也得到了提高,由3.92 MPa分別提升為5.08MPa和5.65 MPa,但復(fù)合鍍層的耐蝕性有所降低。(4)通過對兩種復(fù)合鍍層性能對比可以發(fā)現(xiàn),Ni-Co/ZrO_2復(fù)合鍍層的硬度和結(jié)合強(qiáng)度較高,耐蝕性較好。這可能與Ni-Co/Y_2O_3鍍層表面球狀顆粒且有稍微的團(tuán)聚現(xiàn)象有關(guān),使其部分機(jī)械性能降低。另外,Ni-Co/ZrO_2具有較好的耐磨性,摩擦系數(shù)由原來的0.9降到0.72,磨損量由原來的0.1102 g降到0.1054 g。而Ni-Co/Y_2O_3復(fù)合鍍層具有較高的抗熱沖擊性能,這可能與Y_2O_3具有較強(qiáng)的阻礙Ni向外擴(kuò)散的能力,影響了氧化膜生長機(jī)制有關(guān)。
[Abstract]:Composite plating technology has been favored by everyone, it is an effective surface modification technology which can codeposit alloy and high hardness ceramic particles, on the basis of maintaining the excellent properties of the original alloy coating. Further improve the physical, chemical and other mechanical properties of the coating, in order to cope with a variety of harsh use environment. Nanoparticles have a series of excellent properties, doping them into the coating. It will bring more improvement space to the comprehensive properties of the composite coating, which will be a hot topic in the future. In this paper, the nano-oxides Ys _ 2O _ 3 and ZrO_2 are added to the Ni-Co alloy coating. Codeposition of particles and metals was realized. The influence of the change of process conditions on the basic properties of the coating was investigated. The microstructure of Ni-Co alloy coating was discussed by adding nano-rare earth particles. In this paper, the effects of the kinds of surfactants and pH value, the addition amount of rare earth particles and the current density of electrodeposition on the surface morphology and the content of particles in the composite coating were studied. The influence of the structure grain size and the hardness of the coating on the properties of the coating. The optimized preparation process of Ni-Co/Y_2O_3 and Ni-Co/ZrO_2 nanocomposite coatings was obtained. The main results are as follows: 1). Optimization process of Ni-Co/Y_2O_3 composite coating: nickel aminosulfonic acid in plating solution. 300 g / L; Cobalt sulfamate 13.7 g / L; Nickel chloride 6 g / L; Borate 30 g / L; 12 sodium alkyl sulfate 0.05g / L; Nano-Yalko _ 3 particles 15 g / L; The pH value of the plating solution is 4.0. The deposition current density is 1.0 A / d ~ (-2) and the electrodeposition temperature is 45 鈩，

本文編號：1414766