Stainies steel 30M was treated with the triangle-wave current method to form a different thickness colour film on the surface. The relationship between pitting potential and film thickness. effect of pitting on bright...Stainies steel 30M was treated with the triangle-wave current method to form a different thickness colour film on the surface. The relationship between pitting potential and film thickness. effect of pitting on brightnes (L). psychometnc chroma (a. b). and topography of coloured film were investigated in 3.5% NaCl solution. The relationship between film thickness (X) and pitting potential (Y) is basically linear as expressed by the equation:Y=164.96+0. 16X. R^=0.展开更多
Surface modification techniques with plasma are widely investigated to improve the surface insulation capability of polymers under dry conditions,while the relationship between treatment method,surface physical and ch...Surface modification techniques with plasma are widely investigated to improve the surface insulation capability of polymers under dry conditions,while the relationship between treatment method,surface physical and chemical properties,and wet flashover voltage is still unclear for inorganic ceramics.In this work,the surface insulation properties of ceramics under wet conditions are improved using nanosecond-pulsed dielectric barrier discharge with polydimethylsiloxane(PDMS)as the precursor.The relationships between PDMS concentration and the water contact angle,dry and wet flashover voltages are obtained to acquire the optimal concentration.The surface charge dissipation test and surface physio-chemical property measurement with SEM,AFM,XPS are carried out to further explore the mechanism of surface insulation enhancement.The results show that film deposition with micron thickness and superhydrophobicity occurs at the PDMS concentration of 1.5%.The dry flashover voltage is increased by 14.6%due to the induction of deep traps,while the wet flashover voltage is increased by 66.7%.The gap between dry-wet flashover voltage is decreased by 62.3%compared with the untreated one due to the self-cleaning effect.展开更多
文摘Stainies steel 30M was treated with the triangle-wave current method to form a different thickness colour film on the surface. The relationship between pitting potential and film thickness. effect of pitting on brightnes (L). psychometnc chroma (a. b). and topography of coloured film were investigated in 3.5% NaCl solution. The relationship between film thickness (X) and pitting potential (Y) is basically linear as expressed by the equation:Y=164.96+0. 16X. R^=0.
基金partially supported by National Natural Science Foundation of China(Nos.51977104,52037004 and 52207160)the Natural Science Foundation of Jiangsu Province(No.BK20220341)。
文摘Surface modification techniques with plasma are widely investigated to improve the surface insulation capability of polymers under dry conditions,while the relationship between treatment method,surface physical and chemical properties,and wet flashover voltage is still unclear for inorganic ceramics.In this work,the surface insulation properties of ceramics under wet conditions are improved using nanosecond-pulsed dielectric barrier discharge with polydimethylsiloxane(PDMS)as the precursor.The relationships between PDMS concentration and the water contact angle,dry and wet flashover voltages are obtained to acquire the optimal concentration.The surface charge dissipation test and surface physio-chemical property measurement with SEM,AFM,XPS are carried out to further explore the mechanism of surface insulation enhancement.The results show that film deposition with micron thickness and superhydrophobicity occurs at the PDMS concentration of 1.5%.The dry flashover voltage is increased by 14.6%due to the induction of deep traps,while the wet flashover voltage is increased by 66.7%.The gap between dry-wet flashover voltage is decreased by 62.3%compared with the untreated one due to the self-cleaning effect.
