The addition of Ni element into steel to prolong the service life of coated steel was investigated in marine atmospheric environment by laboratory simulated accelerated experiment.The scanning electron microscope and ...The addition of Ni element into steel to prolong the service life of coated steel was investigated in marine atmospheric environment by laboratory simulated accelerated experiment.The scanning electron microscope and electron probe microanalysis combined with electrochemical impedance spectroscopy were used to characterize coated steel properties and examined the anti-corrosion performance.The results showed that 3 wt.%Ni-advanced steel(3Ni steel)substrate obviously delayed the failure time of coating compared to carbon steel,therefore prolonging the service life of coating on the steel.X-ray diffraction patterns for the corrosion products under the scratched coating on 3Ni steel exhibited that FeNi_(2)O_(4) and Fe_(2)O_(3) occurred in the corrosion product of 3Ni steel.It was also found that Ni element enriched in the product layer through analyzing the appearance and composition of corrosion products by electron probe micro-analysis.Chloride ions were blocked out of product by the enrichment of Ni element in rust layer.展开更多
Twenty isolated strains of Blumeria graminis f.sp. tritici collected from central Gansu province were studied with random amplified polymorphic DNA （RAPD） analysis. PCR amplifications using nine random primers gener...Twenty isolated strains of Blumeria graminis f.sp. tritici collected from central Gansu province were studied with random amplified polymorphic DNA （RAPD） analysis. PCR amplifications using nine random primers generated a total of 81 bands, of which, 54 were polymorphic. The total percentage of polymorphic bands varied from 50.0% to 88.9%. The average percentage based on RAPD patterns was approximately 66.7%, which indicated high heredity differentiation among isolates. Clustering analysis showed that the polymorphism of the twenty isolates was related to geographical origins but had little relationship with the physiological race.展开更多
基金National Key Research and Development Program of China(2016YFC0401205).
文摘The addition of Ni element into steel to prolong the service life of coated steel was investigated in marine atmospheric environment by laboratory simulated accelerated experiment.The scanning electron microscope and electron probe microanalysis combined with electrochemical impedance spectroscopy were used to characterize coated steel properties and examined the anti-corrosion performance.The results showed that 3 wt.%Ni-advanced steel(3Ni steel)substrate obviously delayed the failure time of coating compared to carbon steel,therefore prolonging the service life of coating on the steel.X-ray diffraction patterns for the corrosion products under the scratched coating on 3Ni steel exhibited that FeNi_(2)O_(4) and Fe_(2)O_(3) occurred in the corrosion product of 3Ni steel.It was also found that Ni element enriched in the product layer through analyzing the appearance and composition of corrosion products by electron probe micro-analysis.Chloride ions were blocked out of product by the enrichment of Ni element in rust layer.
文摘Twenty isolated strains of Blumeria graminis f.sp. tritici collected from central Gansu province were studied with random amplified polymorphic DNA （RAPD） analysis. PCR amplifications using nine random primers generated a total of 81 bands, of which, 54 were polymorphic. The total percentage of polymorphic bands varied from 50.0% to 88.9%. The average percentage based on RAPD patterns was approximately 66.7%, which indicated high heredity differentiation among isolates. Clustering analysis showed that the polymorphism of the twenty isolates was related to geographical origins but had little relationship with the physiological race.
