本文選題：化學(xué)復(fù)合鍍　切入點(diǎn)：勻強(qiáng)磁場(chǎng)　出處：《青島科技大學(xué)》2015年碩士論文

【摘要】：本文采用化學(xué)復(fù)合鍍技術(shù),在磁場(chǎng)影響的環(huán)境下通過(guò)向傳統(tǒng)的Ni-P化學(xué)鍍液中加入亞微米金剛石顆粒,制備了Ni-P-金剛石化學(xué)復(fù)合鍍層。作為對(duì)比,同時(shí)使用傳統(tǒng)化學(xué)復(fù)合鍍工藝制備了無(wú)磁場(chǎng)影響的Ni-P-金剛石復(fù)合鍍層。本文使用的金剛石顆粒尺寸在0.01-0.5μm之間,其平均尺寸為0.251μm。利用金相顯微鏡、涂層附著力測(cè)試儀、帶能譜的掃描電子顯微鏡(SEM/EDS)、摩擦磨損試驗(yàn)機(jī)等技術(shù)和設(shè)備,研究了磁場(chǎng)強(qiáng)度對(duì)鍍層中金剛石濃度、形態(tài)、尺寸的影響；利用特斯拉計(jì)對(duì)通電螺線管內(nèi)的磁場(chǎng)場(chǎng)強(qiáng)分部進(jìn)行計(jì)算和測(cè)試并構(gòu)建勻強(qiáng)磁場(chǎng)、梯度磁場(chǎng)環(huán)境,結(jié)合磁化學(xué)理論、吸附理論對(duì)磁場(chǎng)影響化學(xué)復(fù)合鍍的機(jī)理進(jìn)行了分析。結(jié)果顯示,在勻強(qiáng)磁場(chǎng)環(huán)境下,復(fù)合鍍層中金剛石顆粒的含量、尺寸、分散狀態(tài)明顯受到磁場(chǎng)強(qiáng)度的影響,復(fù)合鍍層的沉積速率、顯微硬度、鍍層與基體的結(jié)合強(qiáng)度等隨著磁場(chǎng)強(qiáng)度的增強(qiáng)表現(xiàn)出先增大后減小的趨勢(shì),Ni-P-金剛石復(fù)合鍍層的孔隙率、摩擦系數(shù)隨著磁場(chǎng)強(qiáng)度的增大而增加；鍍液中金剛石濃度為4g/L,磁場(chǎng)強(qiáng)度為10.60mT時(shí),化學(xué)復(fù)合鍍層的摩擦系數(shù)最��；化學(xué)復(fù)合鍍層中各元素的質(zhì)量分?jǐn)?shù)也隨著磁場(chǎng)強(qiáng)度的變化而變化。梯度磁場(chǎng)環(huán)境下,復(fù)合鍍層的顯微硬度、鍍層與基體的結(jié)合強(qiáng)度隨場(chǎng)強(qiáng)梯度變化明顯。結(jié)合磁化學(xué)理論、吸附理論分析認(rèn)為：(1)磁場(chǎng)作用可以加快鎳離子、活化氫原子自由基對(duì)從三重簡(jiǎn)并態(tài)向單重簡(jiǎn)并態(tài)轉(zhuǎn)化,造成鎳離子沉積速度增加；(2)鎳離子沉積速度增加促使了復(fù)合鍍液中的次亞磷酸根離子氧化速率增加,次亞磷酸根離子氧化產(chǎn)生的活化氫原子濃度增大；(3)過(guò)多的氫原子以氫氣的形式逸出反應(yīng)界面,對(duì)反應(yīng)界面附近的化學(xué)復(fù)合鍍液起到微攪拌作用,從而影響化學(xué)復(fù)合鍍層中金剛石顆粒的團(tuán)聚尺寸；(4)強(qiáng)磁場(chǎng)下產(chǎn)生的大量氣泡會(huì)破壞基材表面的活化位點(diǎn),并“沖刷”掉吸附的金剛石顆粒和基體吸附的活化氫原子,造成化學(xué)復(fù)合鍍層中金剛石含量降低,鍍層表面粗糙度增加。對(duì)梯度磁場(chǎng)環(huán)境下,對(duì)化學(xué)復(fù)合鍍層的顯微硬度、結(jié)合力分析表明,磁場(chǎng)對(duì)化學(xué)復(fù)合鍍的影響符合磁化學(xué)理論分析結(jié)果。
[Abstract]:In this paper, Ni-P- diamond electroless composite coating was prepared by adding submicron diamond particles into the traditional Ni-P electroless plating bath under the influence of magnetic field.As a contrast, Ni-P- diamond composite coatings without magnetic field effect were prepared by traditional electroless composite plating process.The size of diamond particles used in this paper is between 0.01-0.5 渭 m and the average size is 0.251 渭 m.The effects of magnetic field strength on the concentration, morphology and size of diamond in the coating were studied by means of metallographic microscope, coating adhesion tester, scanning electron microscope (SEM) with energy spectrum and friction and wear tester.The magnetic field field in solenoid was calculated and measured by Tesla meter, and the uniform magnetic field and gradient magnetic field environment were constructed. The mechanism of the effect of magnetic field on electroless composite plating was analyzed by combining magnetization theory and adsorption theory.The results show that the content, size and dispersion of diamond particles in the composite coating are obviously affected by the magnetic field intensity, the deposition rate and the microhardness of the composite coating under uniform magnetic field.With the increase of the magnetic field intensity, the bonding strength of the coating and the substrate shows a tendency of increasing at first and then decreasing the porosity of Ni-P- diamond composite coating, and the friction coefficient increases with the increase of the magnetic field intensity.When diamond concentration is 4 g / L and magnetic field intensity is 10.60mT, the friction coefficient of the electroless composite coating is the smallest, and the mass fraction of each element in the electroless composite coating changes with the change of the magnetic field intensity.The microhardness of the composite coating and the bonding strength between the coating and the substrate changed obviously with the field intensity gradient under the gradient magnetic field environment.Based on magnetization theory and adsorption theory, it is concluded that the magnetic field action can accelerate the conversion of nickel ion and hydrogen atom radical from triplex state to simple state.The higher the deposition rate of nickel ion, the higher the oxidation rate of phosphite ion in the composite bath.The active hydrogen atoms produced by the oxidation of hypophosphite ions increase the concentration of activated hydrogen atoms.) too many hydrogen atoms escape the reaction interface in the form of hydrogen, which plays a microstirring role in the electroless composite plating bath near the reaction interface.Thus, a large number of bubbles produced under the strong magnetic field will destroy the activation sites on the substrate surface and "scour" the adsorbed diamond particles and the activated hydrogen atoms adsorbed by the matrix, which affect the agglomeration size of diamond particles in the electroless composite coating.The diamond content in the electroless composite coating decreased and the surface roughness increased.The effect of magnetic field on the microhardness and adhesion of the electroless composite coating under the gradient magnetic field environment is in accordance with the results of magnetization theory.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4

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相關(guān)期刊論文 前1條

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本文編號(hào)：1714467