CAJ | 학술논문

为解决电镀铬工艺严重污染环境的问题,制备低污染且具有良好外观的 Ni-Co-B 合金代硬铬镀层.采用单因素实验分别讨论电镀液组成及工艺条件对镀层硬度、外观、沉积速度及阴极电流效率等的影响,确定较优的镀液组成及工艺条件,考察优化条件下所得镀层经不同温度热处理后的镀层硬度,分析镀液的极化情况和200℃热处理1 h 前后镀层的表面形貌、晶体结构及耐蚀性.结果表明:优化条件下得到的合金镀层为纳米晶结构,宏观上均匀光亮,微观上平整、无孔隙,经200℃热处理1 h 后晶体颗粒进行重结晶,晶粒尺寸略有增大,镀层表面更加致密,硬度达10.875 GPa,高于硬铬镀层的,且耐蚀性与硬铬镀层的相当.该电镀工艺有望取代电镀硬铬工艺而获得广泛应用.
위해결전도락공예엄중오염배경적문제,제비저오염차구유량호외관적 Ni-Co-B 합금대경락도층.채용단인소실험분별토론전도액조성급공예조건대도층경도、외관、침적속도급음겁전류효솔등적영향,학정교우적도액조성급공예조건,고찰우화조건하소득도층경불동온도열처리후적도층경도,분석도액적겁화정황화200℃열처리1 h 전후도층적표면형모、정체결구급내식성.결과표명:우화조건하득도적합금도층위납미정결구,굉관상균균광량,미관상평정、무공극,경200℃열처리1 h 후정체과립진행중결정,정립척촌략유증대,도층표면경가치밀,경도체10.875 GPa,고우경락도층적,차내식성여경락도층적상당.해전도공예유망취대전도경락공예이획득엄범응용.
To solve the problem of serious environmental pollution from electroplating chromium process, electroplating Ni-Co-B alloy coatings, which are environment-friendly and with good appearance, were prepared to substitute the hard chromium coating. The effects of electrolyte solution composition and process conditions on the microhardness, appearance, deposition rate of the coatings and current efficiency of the cathode were discussed by single factor experiments. Relatively better compositions of the electrolyte and process conditions were gained. The effects of different heat treatment temperatures on the microhardness of the coatings prepared under the optimized condition were measured. The polarization of electrolyte was analyzed. The surface morphology, microstructure and corrosion resistance of the coatings before and after heat treatment at 200 ℃ for 1 h were characterized. The results show that alloy coatings prepared under the optimized condition are nanocrystalline structure, bright and uniform in macrography, smooth and seamless in micrography. After heat treatment, the grain sizes of coatings slightly increase because of recrystallization, the surfaces become more compact, and the microhardness can be up to 10.875 GPa, which is higher than that of hard chromium coating. Also, the corrosion resistance of alloy coatings after heat treatment is roughly equivalent to that of hard chromium coating. So, this electroplating process is expected to replace the hard chromium plating technology and be widely applied.