摘要
目的提高Ni-P合金镀层的硬度及腐蚀防护性能。方法块体Ti3AlC2颗粒经过氢氟酸的刻蚀作用得到二维层状结构的Ti3C2Tx材料,并通过电沉积技术将其掺杂到Ni-P合金镀层中,从而制备出Ni-P-Ti3C2Tx复合合金镀层,研究复合合金镀层的成分、表面形貌、表面接触角和硬度,并结合动电位极化曲线以及尼奎斯特阻抗图,分析Ti3C2Tx颗粒掺杂对Ni-P合金镀层性能的影响。结果通过深入研究复合合金镀层的性能,发现随着Ti3C2Tx颗粒掺杂量的增加,Ni-P-Ti3C2Tx合金镀层的表面粗糙程度不断增加,这可能是由于导电的Ti3C2Tx颗粒使得合金镀层的树枝状结晶增加,而且合金镀层的表面接触角增大,对于提高合金镀层的腐蚀防护性能有很大的促进作用。由于Ti3C2Tx颗粒的掺杂,合金镀层的显微硬度得到了提高,这主要是依靠于弥散增韧的作用以及有限的晶界。Ni-P-Ti3C2Tx合金镀层的腐蚀防护性能随着Ti3C2Tx颗粒掺杂量的增加,出现了先增加后减小的趋势。结论Ti3C2Tx颗粒的掺杂对提高Ni-P合金镀层的硬度以及腐蚀防护性能有一定的作用。
The work aims to improve the microhardness and corrosion protection of Ni-P coatings.The block Ti3AlC2 particles were disposed with 40%hydrofluoric acid to obtain Ti3C2Tx particles with the two-dimensional layered structure and then Ti3C2Tx particles were added into electroplating bath to prepare Ni-P-Ti3C2Tx composite coatings by electrodeposited technology.The composition,surface morphology,surface contact angle and microhardness of Ni-P-Ti3C2Tx composite coatings were studied,and the effect of Ti3C2Tx particles on the properties of Ni-P coatings was analyzed by combining the dynamic potential polarization curves and Nyquist impedance diagrams.Through in-depth analysis of the performance of Ni-P-Ti3C2Tx composite coatings,the surface roughness of Ni-P-Ti3C2Tx composite coatings increased unceasingly with the increasing doped amount of Ti3C2Tx particles.This was because that the conductive Ti3C2Tx particles increased the dendritic crystal and the surface contact angle of Ni-P-Ti3C2Tx composite coatings grew,thus playing a great role in improving the corrosion protection performance of Ni-P-Ti3C2Tx composite coatings.Moreover,the microhardness of Ni-P-Ti3C2Tx composite coatings improved with the doped Ti3C2Tx particles,mainly depending on the effect of dispersion toughening and limited grain boundaries.The corrosion protection performance of Ni-P-Ti3C2Tx composite coatings increased at first and then decreased with the increasing doped amount of Ti3C2Tx particles.Doped Ti3C2Tx particles can improve the microhardness and corrosion protection of Ni-P composite coatings.
作者
杜英超
仉小猛
魏连启
王永良
于博
叶树峰
DU Ying-chao;ZHANG Xiao-meng;WEI Lian-qi;WANG Tong-liang;YU Bo;YE Shu-feng(State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beying 100049,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第12期87-93,共7页
Surface Technology
基金
国家重点研究计划(2017YFC0703205)~~
