本文選題：再制造 + 電化學(xué)檢測��； 參考：《天津大學(xué)》2012年碩士論文

【摘要】：再制造技術(shù)環(huán)保節(jié)約，是循環(huán)經(jīng)濟(jì)的重要組成，近些年來受到廣泛的關(guān)注。工程機(jī)械再制造技術(shù)包括清洗技術(shù)、檢測技術(shù)、加工修復(fù)技術(shù)這三個(gè)主要方面。我國的檢測技術(shù)和加工修復(fù)技術(shù)都處于研究的初級階段，亟需進(jìn)一步研究。本文首先通過電化學(xué)實(shí)驗(yàn)來確定材料表面缺陷對電化學(xué)測試結(jié)果的影響，提出了一種新的表面缺陷檢測方法，并通過實(shí)際應(yīng)用來驗(yàn)證其可靠性。然后通過化學(xué)鍍實(shí)驗(yàn)來確定不同納米顆粒濃度對鎳-磷-納米顆粒復(fù)合鍍層性能的影響，為用鎳-磷-納米顆粒復(fù)合鍍修復(fù)再制造零部件提供理論依據(jù)。主要研究成果如下： 采用電化學(xué)阻抗譜測試、電化學(xué)噪聲測試和電鏡觀察，并結(jié)合EIS和EN的測試原理，，對材料表面缺陷對測試結(jié)果的影響及其原因進(jìn)行分析。結(jié)果表明：相比于無缺陷的試樣，有缺陷試樣的容抗弧半徑小，阻抗模值低，時(shí)域譜波動劇烈，噪聲頻域譜PSD斜率k更接近-20dB dec-1，是發(fā)生局部腐蝕的特征。三種測試結(jié)果吻合性很好，證實(shí)表面缺陷的電化學(xué)表征是可行的； 采用電化學(xué)方法對機(jī)械工程中的再制造零部件進(jìn)行缺陷檢測，并用三維顯微鏡觀察和超聲相控陣實(shí)驗(yàn)對檢測效果進(jìn)行評價(jià)，驗(yàn)證用電化學(xué)方法檢測表面缺陷的實(shí)際可操作性。結(jié)果表明：電化學(xué)方法檢測表面缺陷有較好的準(zhǔn)確性，可用于實(shí)際應(yīng)用。 采用鎳-磷-納米顆�；瘜W(xué)復(fù)合鍍技術(shù)，研究了不同濃度的碳納米管（0g/L，0.5g/L，1.0g/L，1.5g/L）和納米二氧化鈦（0g/L，1g/L，2g/L，3g/L）分別對復(fù)合鍍層的耐蝕性能、耐磨損性能、表面硬度等的影響。結(jié)果表明：相對于Ni-P鍍層，復(fù)合鍍層耐蝕性更優(yōu)，但是隨著碳納米管濃度的增加而降低，在0.5g/L時(shí)耐蝕性能最好。耐蝕性隨著納米二氧化鈦濃度的增加而增加；相對于Ni-P鍍層，Ni-P-碳納米管鍍層耐磨損性能和表面硬度值也更優(yōu)，而且隨著碳納米管濃度的增加而提高。Ni-P-納米二氧化鈦鍍層耐磨損性能和表面硬度值卻變差，但著納米二氧化鈦濃度的增加而提高。
[Abstract]:Environmental conservation of remanufacturing technology is an important component of circular economy, which has received extensive attention in recent years. The remanufacturing technology of construction machinery includes three main aspects: cleaning technology, testing technology and machining and repairing technology. The detection technology and the machining repair technology in our country are in the primary stage of research, and need to be further studied. In this paper, the influence of surface defects on the results of electrochemical measurement is determined by electrochemical experiments, and a new method of surface defect detection is proposed, which should be used to verify the reliability of the method. Then the influence of different concentration of nanoparticles on the properties of Ni-P nanoparticles composite coating was determined by electroless plating experiments, which provided a theoretical basis for repairing the remanufactured parts by Ni-P nanoparticles composite plating. The main findings are as follows: Electrochemical impedance spectroscopy (EIS), electrochemical noise measurement and electron microscopy were used to analyze the influence of surface defects on the test results and their causes. The results show that the defect samples have smaller capacitance arc radius, lower impedance mode value, sharp fluctuation of time-domain spectrum, and the noise frequency domain PSD slope k is closer to -20dB dec-1, which is the characteristic of local corrosion. The results of the three tests are in good agreement with each other, which proves that the electrochemical characterization of surface defects is feasible. The defect detection of remanufactured parts in mechanical engineering was carried out by electrochemical method. The detection effect was evaluated by three-dimensional microscope observation and ultrasonic phased array experiment. The practicability of using electrochemical method to detect surface defects was verified. The results show that the electrochemical method has good accuracy and can be used in practical application. The effects of different concentrations of carbon nanotubes (0 g / L 0. 5 g / L 1. 0 g / L 0 g / L 1 g / L 2 g / L 3 g / L) on the corrosion resistance, wear resistance and surface hardness of the composite coatings were studied by electroless composite plating technique. The results show that the corrosion resistance of the composite coating is better than that of the Ni-P coating, but the corrosion resistance of the composite coating decreases with the increase of the concentration of carbon nanotubes, and the corrosion resistance of the composite coating is the best in the case of 0.5g/L. The corrosion resistance of Ni-P- carbon nanotube coating increased with the increase of TIO _ 2 concentration, and the wear resistance and surface hardness of Ni-P- carbon nanotube coating were also better than that of Ni-P coating. With the increase of carbon nanotube concentration, the wear resistance and surface hardness of Ni-P- nano-TiO _ 2 coating become worse, but the increase of nano-titanium dioxide concentration increases.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：O657.1;TH16

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