电池钢带电镀镍磷合金工艺及性能的研究

发布时间：2018-06-06 18:36

  本文选题：脉冲工艺 + 最佳工艺参数　； 参考：《燕山大学》2015年硕士论文

【摘要】：近些年来,Ni-P镀层有着耐腐蚀性好,硬度高,光亮度好的特点,被应用到各个行业,在航空行业以及微电子制造方面大受欢迎,电池钢带的镀层也转移到这个方向上来,所以如何生产出质量优异的合金镀层,是人们备受关注的问题。目前,电池钢带为了获得更好的镀层,采用了脉冲电源,它有着降低浓差极化并且增大电化学极化的特点,所以,利用脉冲电源是改善镀层质量的一个新方向。本文采取脉冲电镀的方法,在亚磷酸体系下,对低碳薄钢板电镀Ni-P合金。利用电化学方法对电池钢带的直流电镀Ni-P镀层、单脉冲电镀Ni-P镀层以及双脉冲电镀Ni-P镀层做了耐腐蚀性的研究。分别用极化曲线表示出三种Ni-P镀层在3.5%Na Cl溶液、1 mol/L H2SO4溶液和1 mol/L Na OH溶液中的耐腐蚀性,并用扫描电镜对这些镀层的表面做了分析,还采用了失重法对这些镀片做了实验,从极化曲线得到自腐蚀电流密度从小到大依次为:双脉冲单脉冲直流电镀;观察表面形貌得知直流镀片受到的腐蚀最严重,双脉冲镀片受到的腐蚀最小;根据失重法测量失重由大到小依次为:直流电镀片、单脉冲电镀片、双脉冲电镀片。三种钢带在酸碱盐溶液中进行浸泡,都被腐蚀,在碱性溶液与中性溶液中是被小面积腐蚀的,而在酸性溶液中被大面积腐蚀,结果表明:在酸性溶液中钢带腐蚀的最严重。本实验采取了三种方法得到三种电池钢带:直流电镀Ni-P层、单脉冲电镀Ni-P层以及双脉冲电镀Ni-P层。直流电镀Ni-P层的最佳实验参数:平均电流密度为2.5A/dm2,反应温度为65℃,p H值取1.5-2.1时,电池钢带的耐腐蚀性最好;单脉冲电镀Ni-P层的最佳实验参数:平均电流密度为2A/dm2,占空比为0.3,反应温度为65℃,p H值为2时电池钢带的耐腐蚀性最好;本实验又采用了正交实验法以及单因素法得到了双脉冲电镀优于单脉冲和直流电镀,最后得到双脉冲最佳实验参数是正向导通时间为15ms、正向关断时间为85ms、正向工作时间为120ms、正向平均电流密度2A/dm2、反向导通时间10ms、反向关断时间为15ms、反向平均电流密度0.025A/dm2、反向工作时间为30ms。
[Abstract]:In recent years, the Ni-P coating has the characteristics of good corrosion resistance, high hardness and good brightness. It has been applied to various industries. It is very popular in the aviation industry and microelectronics manufacturing. The coating of the battery steel strip has also been transferred to this direction. So how to produce high quality alloy coating is a problem that people pay more attention to. At present, in order to obtain better coating, the battery steel strip adopts pulse power supply, which has the characteristics of reducing the concentration polarization and increasing the electrochemical polarization. Therefore, the use of pulse power supply is a new direction to improve the quality of the coating. In this paper, Ni-P alloy was electroplated on low carbon thin steel plate by pulse electroplating in phosphorous acid system. The corrosion resistance of direct current Ni-P plating, single pulse Ni-P plating and double pulse Ni-P plating were studied by electrochemical method. The corrosion resistance of three kinds of Ni-P coatings in 3.5 NaCl solutions and 1 mol / L NaOH solution were obtained by polarization curves, respectively. The surface of these coatings was analyzed by scanning electron microscope, and the experiments were carried out by weightlessness method. From the polarization curve, the order of self-corrosion current density is as follows: double pulse monopulse DC electroplating, the observation of surface morphology shows that the corrosion of DC plating is the most serious, and the corrosion of double-pulse plating is the least. According to weightlessness measurement, the order of weightlessness is DC electroplating, monopulse electroplating and double pulse electroplating. Three kinds of steel strips were corroded in acid and alkali solution. They were corroded in alkaline solution and neutral solution, while in acid solution, they were corroded in large area. The results showed that the corrosion of steel strip was the most serious in acid solution. In this experiment, three kinds of battery strip were obtained by three methods: direct current plating Ni-P layer, monopulse electroplating Ni-P layer and double pulse electroplating Ni-P layer. The optimum experimental parameters of Ni-P coating are as follows: the corrosion resistance of battery steel strip is the best when the average current density is 2.5A / dm2, the reaction temperature is 65 鈩，

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