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水溶液中不锈钢电极上电沉积碳的研究

作者:优质期刊论文发表网  来源:www.yzqkw.com  发布时间:2019/11/1 9:28:26  

摘要:因具有优良的摩擦学性能和化学惰性等优点,碳膜在近些年来受到了人们越来越多的关注,广泛应用于材料的表面改性。碳膜在不锈钢表面具有极其普遍的应用。不锈钢上碳膜的沉积大多采用的是物理气相沉积和化学气相沉积的方法实现。然而,这些技术通常需要在高温,高真空的环境中进行,设备复杂昂贵。电沉积法因其具有设备廉价,沉积条件温和的优点而成为工业生产中常用的制备方法。因此,通过电沉积的方法在不锈钢基体上沉积碳膜的研究也引起了人们的广泛研究热潮。

本文在较低的电压和常温条件下,以氯乙酸为碳源,以硫酸钠或甲酸钠为电解质从水溶液体系中在304不锈钢上进行了碳膜的电沉积实验。利用拉曼光谱、扫描电子显微镜、接触角测量仪及CFT-Ⅰ材料表面性能综合测试仪对薄膜的结构成分、表面形貌、疏水性能及摩擦学性能进行了表征。本文所研究的电沉积碳膜的工艺成功实现了水溶液体系中碳膜在304不锈钢上的低电压常温电沉积。

1.硫酸钠体系中电沉积碳膜的研究

以氯乙酸为碳源,硫酸钠为支持电解质,在低电压下通过改变碳源浓度、电解质浓度、沉积电压、沉积温度和沉积时间在304不锈钢上制备碳膜。

得到最佳的沉积条件为:氯乙酸浓度2 g/L,硫酸钠浓度60 g/L,沉积电压10 V, 沉积温度40 ℃,沉积时间2 h。研究结果表明:以氯乙酸为碳源,硫酸钠为支持电解质的水溶液中,在低电压和常温条件下,成功的电沉积出致密碳膜。通过接触角测量仪(JC2000D1)和CFT-Ⅰ材料表面性能综合测试仪分析结果表明:所制备的碳膜具有较好的疏水性能和摩擦学性能。

2.甲酸钠体系中电沉积碳膜的研究

以氯乙酸为碳源,甲酸钠为辅助碳源和电解质,在低电压下通过改变碳源浓度、电解质浓度、沉积电压、沉积温度和沉积时间在304不锈钢上制备碳膜。

得到最佳的沉积条件为:氯乙酸浓度2 g/L,甲酸钠浓度75 g/L,沉积电压10 V, 沉积温度60 ℃,沉积时间1 h。研究结果表明:以氯乙酸为碳源,甲酸钠为电解质的水溶液中,在低电压条件下,成功的电沉积出碳膜。通过接触角测量仪(JC2000D1)和CFT-Ⅰ材料表面性能综合测试仪分析结果表明:所制备的碳膜具有较好的疏水性能和摩擦学性能。

Carbon films have attracted more attentionand been widely used in the surface modification of materials in recent yearsdue to its excellent tribological properties and chemical inertness. Theapplication of the carbon films on stainless steel surface is particularlyextensive. Conventional methods for depositing carbon films on stainless steelsare physical vapor deposition and chemical vapor deposition. However, thesetechnologies usually need to be carried out in a high-temperature, high-vacuumenvironment, and the equipment is complicated and expensive. The method ofelectrodeposition could be applied to industrial production because of itsinexpensive equipment and mild deposition conditions. Therefore, the currentresearch on the electrochemical deposition of carbon films on stainless steelsubstrates has also attracted one’s attention.

carbon film was liquid-phaseelectrodeposited on 304 stainless steel under low voltage in aqueous solutionsystem. The morphology and microstructure of the films were analyzed byscanning electron microscopy (SEM) and Raman spectroscopy. The hydrophobicityof the carbon film was measured with contact angle meter. The tribologicalperformance of the carbon film was measured with a computationally controlledball-on-plate type wear test machine (CFT-Ⅰ). The methods in this paper hassucceeded in depositing the carbon film on the 304 stainless steels under lowvoltage in the aqueous solution system. Major conclusions are as follows:

1.Electrodeposition of carbon film on 304stainless steel in sodium sulfate system

carbon films were successfullyelectrodeposited at low applied voltage with chloroacetic acid as carbon sourceand sodium sulfate as support electrolyte. the concentration of the carbonsource and sodium sulfate, the applied voltage, temperature and the depositiontime were systematically investigated and optimized

The optimal conditions are: 2 g/Lchloroacetic acid and 60 g/L sodium sulfate aqueous solution, 10 V, 40 ℃, 2 h.The results show that the addition of sodium sulfate could increase the currentdensity and realize the electrodeposition of carbon film on 304 stainless steeleffectively. The results on contact angle and friction coefficient show thatthe deposited carbon films have good hydrophobicity and tribologicalperformance.

2. Electrodeposition carbon film on 304stainless steel in sodium formate system under low voltage

Electrodeposition of carbon films at lowapplied voltage with chloroacetic acid as carbon source, sodium sulfate asauxiliary carbon sources and electrolyte. During the experiments, theconcentration of the carbon source and sodium formate, the applied voltage,temperature and the deposition time were investigated.

The optimal conditions are: 2 g/Lchloracetic acid and 75 g/L sodium formate aqueous solution, 10 V, 60 ℃, 1 h.The results show that the addition of sodium formate could make it possible toelectrodeposit carbon film on 304 stainless steel effectively. The analysisresults of contact angle meter and ball-on-plate type wear test machine (CFT-Ⅰ)show that the deposited carbon films have good hydrophobicity and tribologicalproperties.

关键词:碳膜;电化学沉积;水溶液;304不锈钢

Carbon films; Electrodeposition; Aqueoussolutions; 304 stainless steel

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