【摘要】：電刷鍍技術(shù)是屬于電沉積技術(shù)的一項分支,因其具有操作簡單、鍍層沉積速度較快、費用較低等優(yōu)點而被廣泛應(yīng)用于各個工業(yè)領(lǐng)域當中。本文確定了制備Ni-SiC納米復(fù)合鍍層的各項工藝參數(shù)以及鍍液的組成,通過在刷鍍液中添加SiC粒子,獲得了Ni-SiC納米復(fù)合鍍層。研究了電刷鍍液中的硫酸鎳濃度、絡(luò)合劑濃度、鍍液的pH值以及工作電壓、相對運動速度等因素對鍍層沉積速率、SiC復(fù)合量以及鍍層顯微硬度的影響。其次,利用掃描電鏡對Ni-SiC納米復(fù)合鍍層的表面形貌進行觀察,并利用掃描電鏡所配套的EDS能譜儀對復(fù)合鍍層成分進行檢測分析。結(jié)果表明:采用適宜的工藝條件以及合理的化學(xué)藥品搭配可得到較快的鍍層沉積速度、較高的SiC粒子復(fù)合量及較強的硬度。經(jīng)SEM分析發(fā)現(xiàn),擁有較高SiC粒子復(fù)合量的鍍層表面形貌相較于普通純鎳鍍層具有更加平整、光滑的表面以及致密的組織結(jié)構(gòu),鍍層裂紋數(shù)量顯著減少,因此說明SiC粒子可顯著提升鍍層緊密程度,降低鍍層內(nèi)應(yīng)力。腐蝕試驗結(jié)果表明,Ni-SiC納米復(fù)合鍍層比純鎳鍍層具有更好的耐腐蝕性能;孔隙率試驗結(jié)果表明,鍍層厚度影響著鍍層孔隙率的大小,當鍍層厚度達到25μm時,Ni-SiC復(fù)合鍍層的空隙率率先達到0,而當鍍層厚度為30μm時,純鎳鍍層的孔隙率為0,因此說明Ni-SiC復(fù)合鍍層的結(jié)構(gòu)相較于純鎳鍍層更加致密,質(zhì)量較好;鍍層結(jié)合強度實驗表明,純鎳鍍層與Ni-SiC復(fù)合鍍層的結(jié)合強度均表現(xiàn)良好,相差無幾;摩擦磨損試驗結(jié)果表明,隨著摩擦?xí)r間的推移,Ni-SiC納米復(fù)合鍍層的磨損量要明顯小于純鎳鍍層,且經(jīng)SEM分析,純鎳鍍層在磨損以后出現(xiàn)分層現(xiàn)象,而Ni-SiC納米復(fù)合鍍層則無此現(xiàn)象出現(xiàn),也證明了Ni-SiC納米復(fù)合鍍層的耐磨性要優(yōu)于純鎳鍍層。當氧化溫度在600℃~850℃之間時,Ni-SiC納米復(fù)合鍍層的抗高溫氧化能力要優(yōu)于純鎳鍍層。
[Abstract]:Brush plating is a branch of electrodeposition technology, which is widely used in various industrial fields because of its advantages of simple operation, fast deposition speed and low cost. In this paper, the process parameters and the composition of Ni-SiC nano-composite coating were determined. The Ni-SiC nano-composite coating was obtained by adding SiC particles into the brush plating solution. The effects of nickel sulfate concentration, complexing agent concentration, pH value, working voltage and relative movement speed on the deposition rate, SiC recombination amount and microhardness of the coating were studied. Secondly, the surface morphology of Ni-SiC nanocomposite coating was observed by scanning electron microscope (SEM), and the composition of composite coating was analyzed by EDS spectrometer. The results show that the deposition rate, the amount of SiC particles and the hardness of the coating can be obtained by using the appropriate process conditions and the reasonable combination of chemicals. By SEM analysis, it was found that the surface morphology of the coating with higher SiC particle recombination amount was more smooth, smooth surface and compact structure than that of the ordinary pure nickel coating, and the number of cracks in the coating decreased significantly. Therefore, SiC particles can significantly improve the closeness of the coating and reduce the internal stress of the coating. The corrosion test results show that the corrosion resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating, and the porosity test shows that the thickness of the coating affects the porosity of the coating. When the coating thickness is up to 25 渭 m, the porosity of Ni-SiC composite coating reaches 0 first, while when the thickness of coating is 30 渭 m, the porosity of pure nickel coating is 0. Therefore, the structure of Ni-SiC composite coating is more compact and the quality is better than that of pure nickel coating. The bonding strength of pure nickel coating and Ni-SiC composite coating is similar to that of pure nickel coating, and the results of friction and wear test show that the bonding strength of pure nickel coating is similar to that of Ni-SiC composite coating. With the increase of friction time, the wear amount of Ni-SiC nanocomposite coating is obviously smaller than that of pure nickel coating. After SEM analysis, the pure nickel coating appears delamination after wear, but Ni-SiC nanocomposite coating does not. It is also proved that the wear resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating. When the oxidation temperature is between 600 鈩，

本文編號：2268077