In this study,a phosphate-based conversion coating(PCC)was applied as a precursor before forming silicate-fluoride(SiF)and silicate-phosphate-fluoride(SiPF)based flash-plasma electrolytic oxidation(Flash-PEO)coatings ...In this study,a phosphate-based conversion coating(PCC)was applied as a precursor before forming silicate-fluoride(SiF)and silicate-phosphate-fluoride(SiPF)based flash-plasma electrolytic oxidation(Flash-PEO)coatings on AZ31B magnesium alloy.The main novelty is the successful incorporation of calcium,zinc,manganese and phosphate species into the Flash-PEO coatings via a precursor layer rather than using the electrolyte.The precursor also led to longer lasting and more intense discharges during the PEO process,resulting in increased pore size.Corrosion studies revealed similar short-term performance for all coatings,with impedance modulus at low frequencies above 10^(7)Ωcm^(2),and slightly better performance for the SiPF-based coating.Nonetheless,the enlarged pores in the PEO coatings functionalized with the PCC precursor compromised the effectiveness of self-healing mechanisms by creating diffusion pathways for corrosive species,leading to earlier failure.These phenomena were effectively monitored by recording the open circuit potential during immersion in 0.5 wt.%NaCl solution.In summary,this study demonstrates that conversion coatings are a viable option for the functionalization of PEO coatings on magnesium alloys,as they allow for the incorporation of cationic and other species.However,it is crucial to maintain a small pore size to facilitate effective blockage through self-healing mechanisms.展开更多
研究聚焦于闪存转换层(FTL)中间件的性能差异,在256 MB Nor Flash硬件平台上,对FlashFX和TrueFFS两种闪存转换层进行了系统性对比评估,通过测量包括扇区擦除、文件打开、文件删除、单文件写入及文件连续写入等关键操作的耗时,量化分析...研究聚焦于闪存转换层(FTL)中间件的性能差异,在256 MB Nor Flash硬件平台上,对FlashFX和TrueFFS两种闪存转换层进行了系统性对比评估,通过测量包括扇区擦除、文件打开、文件删除、单文件写入及文件连续写入等关键操作的耗时,量化分析两者性能表现。结果表明FlashFX与TrueFFS在不同操作场景下(如擦除粒度处理、写入调度策略)存在显著性能差异,TrueFFS适用于高可靠性、长寿命需求的系统,FlashFX更适合对操作速度敏感的应用,二者选择需基于具体场景的性能与寿命进行权衡。展开更多
基金support of the PID2021-124341OB-C22/AEI/10.13039/501100011033/FEDER,UE(MICIU)J.M.Vega also acknowledges the Grant RYC2021-034384-I funded by MICIU/AEI/10.13039/501100011033 and by“European Union Next Generation EU/PRTR”.
文摘In this study,a phosphate-based conversion coating(PCC)was applied as a precursor before forming silicate-fluoride(SiF)and silicate-phosphate-fluoride(SiPF)based flash-plasma electrolytic oxidation(Flash-PEO)coatings on AZ31B magnesium alloy.The main novelty is the successful incorporation of calcium,zinc,manganese and phosphate species into the Flash-PEO coatings via a precursor layer rather than using the electrolyte.The precursor also led to longer lasting and more intense discharges during the PEO process,resulting in increased pore size.Corrosion studies revealed similar short-term performance for all coatings,with impedance modulus at low frequencies above 10^(7)Ωcm^(2),and slightly better performance for the SiPF-based coating.Nonetheless,the enlarged pores in the PEO coatings functionalized with the PCC precursor compromised the effectiveness of self-healing mechanisms by creating diffusion pathways for corrosive species,leading to earlier failure.These phenomena were effectively monitored by recording the open circuit potential during immersion in 0.5 wt.%NaCl solution.In summary,this study demonstrates that conversion coatings are a viable option for the functionalization of PEO coatings on magnesium alloys,as they allow for the incorporation of cationic and other species.However,it is crucial to maintain a small pore size to facilitate effective blockage through self-healing mechanisms.
文摘研究聚焦于闪存转换层(FTL)中间件的性能差异,在256 MB Nor Flash硬件平台上,对FlashFX和TrueFFS两种闪存转换层进行了系统性对比评估,通过测量包括扇区擦除、文件打开、文件删除、单文件写入及文件连续写入等关键操作的耗时,量化分析两者性能表现。结果表明FlashFX与TrueFFS在不同操作场景下(如擦除粒度处理、写入调度策略)存在显著性能差异,TrueFFS适用于高可靠性、长寿命需求的系统,FlashFX更适合对操作速度敏感的应用,二者选择需基于具体场景的性能与寿命进行权衡。
