PlatingandFinishingMar.2023Vol.45No.3SerialNo.360Watts型镀钴体系电沉积工艺优化卓健飞1,何雨波1,汪镇涛2,谢新1,刘亚雄1,张志新1,王帅星2*,杜楠2(1.中国航发长江动力有限公司,湖南岳阳414001;2.南昌航空大学材料科学与工程学院,江西南昌330063)摘要:针对Watts型镀钴工艺,系统研究了Co2+/H3BO3摩尔比、表面活性剂、pH、温度、电流密度等参数对镀层沉积速度、硬度及微观结构的影响规律,获得了较佳的Watts型镀钴工艺方案。结果表明:适当增加Co2+含量可以加快镀层沉积速度,但过高Co盐会使阴极极化度减小、镀层结晶粗大;Co2+/H3BO3摩尔比在1.5时,Co2+的沉积电位较负、结晶更为细致。电流密度对镀层沉积速度影响最大,溶液pH值则显著影响镀层显微硬度;提高电流密度,镀层沉积加快,但镀层容易粗糙,电流密度可选择4A/dm2;升高镀液pH值有助于获得细致镀层,但pH>5后镀液易出现沉淀;温度在40℃时镀层沉积速度和硬度均较佳。在优化的Watts型镀钴体系下所得镀层呈灰白色,晶粒呈棱片状,表面平整光滑,镀层硬度为320HV,沉积速度为22μm/h。GH4169合金表面施镀60μm厚的钴镀层,可以显著改善其耐磨性。关键词:钴;电沉积;Watts型;工艺参数;镀层硬度中图分类号:TG174.451文献标识码:AOptimizationofcobaltelectrodepositionprocessinWattsbathZhuoJianfei1,HeYubo1,WangZhentao2,XieXin1,LiuYaxiong1,ZhangZhixin1,WangShuaixing2*,DuNan2(1.AECCChangjiangEngineCompanyCo.Ltd.,Yueyang414001,China;2.SchoolofMaterialsScienceandEngineering,NanchangHangkongUniversity,Nanchang330063,China)Abstract:TheeffectsofCo2+/H3BO3molarratio,surfactant,pH,temperatureandcurrentdensityonthedepositionrate,hardnessandmicrostructureofthecoatingweresystematicallystudied,andabetterWattstypecobaltplatingelectroplatingprocesswasobtained.TheresultsshowthatproperincreaseofCo2+contentcanincreasethedepositionrateofcoating,buttoohighcontentofcobaltsaltmayreducethecathodepolarizationandmakecoarsecrystalgrains.ThedepositionpotentialofCo2+ismorenegativeandthecoatinggrainsarefinerwhenthemolarratioofCo2+/H3BO3is1.5.Thecurrentdensityhasthegreatestinfluenceonthedepositionrateofcoating,butpHvalueofthesolutionsignificantlyaffectsthecoatinghardness.Ifthecurrentdensit...