镀液中钨酸钠浓度对电沉积镍-钨合金性能的影响  

Effect of sodium tungstate concentration in bath on electrodeposition of nickel-tungsten alloy

作　　者：王二立 张长科 陆欣 鞠辉 WANG Erli;ZHANG Changke;LU Xin;JU Hui(Hunan Nanofilm New Material Technology Co.,Ltd.,Changsha 410000,China)

机构地区：[1]湖南纳菲尔新材料科技股份有限公司,湖南长沙410000

出　　处：《电镀与涂饰》2024年第5期14-21,共8页Electroplating & Finishing

摘　　要：[目的]研究镀液中钨酸钠浓度对Ni–W合金镀层性能的影响,制备适合在高温环境中应用的耐磨Ni–W合金镀层。[方法]通过改变镀液中钨酸钠的质量浓度,采用直流电沉积法在20CrMoA钢表面制备了不同W质量分数的Ni–W合金镀层。研究了钨酸钠质量浓度对沉积速率,以及Ni–W合金镀层的W质量分数、形貌、密度、显微硬度和抗高温氧化性能的影响。[结果]镀液的钨酸钠浓度显著影响着Ni–W合金镀层的W质量分数,进而影响镀层的形貌、内应力、显微硬度及抗高温氧化性能。镀液中钨酸钠的质量浓度为40 g/L时,所得Ni–W合金镀层平整致密,无裂纹,W质量分数为34.82%,密度约为10.88 g/cm^(3),经500°C热处理后的显微硬度高达1199.6 HV,抗高温氧化能力远优于兵器工业中常用的PCrNi3MoVA合金钢。[结论]本文的研究结果可为Ni–W合金镀层在武器身管等高温高磨损环境中的应用提供实验依据。[Introduction]The effect of the concentration of sodium tungstate in bath on the properties of Ni–W alloy coating needs to be studied to prepare a wear-resistant Ni–W alloy coating for application in high-temperature environments.[Method]Ni–W alloy coatings with different mass fractions of tungsten were electrodeposited on 20CrMoA steel under direct current by adjusting the mass concentration of sodium tungstate in bath.The effect of the mass concentration of sodium tungstate on the deposition rate,and the W content,morphology,density,microhardness,and high-temperature oxidation resistance of Ni–W alloy coating was studied.[Result]The mass concentration of sodium tungstate in bath had significant impact on the W content of Ni–W alloy coating,which further affected the morphology,internal stress,microhardness,and high-temperature oxidation resistance of Ni–W alloy coating.The Ni–W alloy electrodeposited with 40 g/L of sodium tungstate was smooth,compact,and crack-free,contained 34.82%(mass fraction)of W,had a density of 10.88 g/cm^(3) and a microhardness up to 1199.6 HV after being annealed at 500°C,and showed much better high-temperature oxidation resistance than the PCrNi3MoVA alloy steel commonly used in the weapon industry.[Conclusion]The results of this paper can provide experimental basis for application of Ni–W alloy coating in high-temperature and high-wear environments such as weapon barrel.

关 键 词：镍–钨合金 电沉积 钨酸钠 内应力 显微硬度 抗高温氧化性能 

分 类 号：TQ153.2[化学工程—电化学工业]