27SiMn合金钢电沉积镍-钴合金镀层的性能
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摘要
以27SiMn合金钢为基体,在氨基磺酸盐镀液中电沉积镍-钴合金镀层。通过调节镀液中氨基磺酸钴的质量浓度,获得了不含钴的镀镍层及钴的质量分数为7.3%、15.6%、32.7%、41.4%的四种镍-钴合金镀层。研究了镀层中钴的质量分数对镀层的内应力、显微硬度和抗拉强度的影响。结果表明:随着镀层中钴的质量分数的升高,镀层的内应力、显微硬度和抗拉强度呈相似的变化趋势;当镀层中钴的质量分数为32.7%时,镀层的内应力、显微硬度和抗拉强度均达到最大值,分别为42MPa、5 467MPa、837MPa。
Nickel-cobalt alloy coatings were electrodeposited on 27 SiMn alloy steel substrate from sulfamate bath.A nickel coating without cobalt and four kinds of nickel-cobalt alloy coatings containing various mass fraction of cobalt(7.3%,15.6%,32.7%,41.4%,respectively)were obtained by adjusting the mass concentration of cobalt sulfamate in sulfamate bath.The influence of mass fraction of cobalt on the internal stress,microhardness and tensile strength of the coatings was studied.Results showed that there was a similar trend of change in the internal stress,microhardness and tensile strength of the coatings between various mass fraction of cobalt. When the mass fraction of cobalt was 32.7%,the internal stress,microhardness and tensile strength reach the maximum of 42 MPa,5 467 MPa and 837 MPa,respectively.
Nickel-cobalt alloy coatings were electrodeposited on 27 SiMn alloy steel substrate from sulfamate bath.A nickel coating without cobalt and four kinds of nickel-cobalt alloy coatings containing various mass fraction of cobalt(7.3%,15.6%,32.7%,41.4%,respectively)were obtained by adjusting the mass concentration of cobalt sulfamate in sulfamate bath.The influence of mass fraction of cobalt on the internal stress,microhardness and tensile strength of the coatings was studied.Results showed that there was a similar trend of change in the internal stress,microhardness and tensile strength of the coatings between various mass fraction of cobalt. When the mass fraction of cobalt was 32.7%,the internal stress,microhardness and tensile strength reach the maximum of 42 MPa,5 467 MPa and 837 MPa,respectively.
引文
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[2] ZAMANI M,AMADEH A,BAGHAL S M L.Effect of Co content on electrodeposition mechanism and mechanical properties of electrodeposited Ni-Co alloy[J].Transactions of nonferrous metals society of China,2016,26(2):484-491.
[3]屈新鑫,葛文,杨倩,等.换向脉冲电沉积纳米晶镍钴合金及其微观结构[J].电镀与涂饰,2013,32(10):14-18.
[4]于明明.双向脉冲镍钴合金电铸技术实验研究[D].厦门:华侨大学,2013.
[5] GOLODNITSKY D,YU R,ULUS A.The role of anion additives in the electrodeposition of nickel-cobalt alloys from sulfamate electrolyte[J].Electrochimica acta,2003,47(17):2707-2714.
[6]王立平,高燕,刘惠文,等.电沉积梯度Ni-Co纳米合金镀层的研究[J].电镀与涂饰,2004,23(6):5-7.
[7]王燕,雷永平,符寒光,等.硫酸盐型镀液中电沉积低应力镍钴合金镀层的研究[J].材料工程,2010(8):16-19.
[8]秦丽元,连建设,蒋恩臣,等.不同结构纳米晶镍钴合金的力学性能[J].中国有色金属学报,2013,23(10):2846-2850.