Preparation Technology Of Double Anode Composite Electroplated Ni-SiC Piston Rings

Piston ring is one of the most complex friction parts in the diesel engine.It not only withstands transient loads,speeds and temperatures,but also changes the lubrication conditions.In order to cope with the increasingly strict emission requirements and extend the service time of internal combustion engines,the tribological performance of piston rings can be improved by preparing Ni-SiC composite electroplated piston rings which can decrease the friction and wear.The composite plating experiment was carried out on the piston rings of the R6160 diesel engine.The preparation possibilities of the of the double anodes composite electroplated Ni-SiC piston ring were discussed.Meanwhile,the hardness,wear resistance and morphology under the electron microscope were studied to develop new piston ring wear-resistant functional layer material to improve the durability and reliability of the diesel engine for better results.The effects of SiC particle concentration,particle size,surfactant concentration and surfactant type on the electroplated Ni-SiC composite coating were studied to meet the requirements on modern diesel piston ring hardness.Firstly,the SiC particle concentration is obtained through analysis.The particle size has a great influence on the piston ring composite coating.The SiC particles with a particle concentration of 8g/L and 40nm are finer and more compact in structure than the 100nm SiC particles.Secondly,the influence of surfactant type and concentration on Ni-SiC composite coating was analyzed.The results show that the distribution of SiC particles in electrodeposits is more uniform and dispersed when surfactant is added as CTBA.At the same time,the amount of SDS should be controlled around 5 g/L when the compound amount of SiC particles increased significantly.When the PEI concentration of 0.08 g/L is added,the plating structure will be more compact and the dispersion effect will be the best.Finally,through the HV-1000 micro hardness tester,the microhardness of the obtained coating can reach the maximum value of 730HV,which has exceeded the original coating 11HV,which can meet the requirements of modern diesel piston ring hardness.The wear resistance of the composite electroplated piston ring was tested by HT-1000 high temperature friction and wear tester,The wear weight of the coating was reduced after electroplating.