In this study,the effect of Pb content on the surface morphology and salt spray corrosion resistance of hot dip Zn-AI-Mg coatings was investigated. The results showed that the coating surface easily formed small grain...In this study,the effect of Pb content on the surface morphology and salt spray corrosion resistance of hot dip Zn-AI-Mg coatings was investigated. The results showed that the coating surface easily formed small grains of zinc spangle structures and that the salt spray con＇osion resistance of the coating decreased when Pb content was greater than 0.01%. The microstructure and energy dispersive spectrum analysis of surface and cross-sectional areas was performed by scanning electron microscopy. Pb content present in the coating was analyzed by glow discharge spectrum. The results showed that the distribution of Pb in the coating was not uniform. The Pb content was segregated on the surface and at the cross-section of the Zn-A1-MgZn2 ternary eutectic structure,especially,on the surface of the Zn-A1-MgZn2 ternary eutectic structure.展开更多
<div style="text-align:justify;"> According to the survey materials of the waters of Jiaozhou Bay in May, September and October 1993, this article studied the content of Pb and its horizontal distribut...<div style="text-align:justify;"> According to the survey materials of the waters of Jiaozhou Bay in May, September and October 1993, this article studied the content of Pb and its horizontal distribution in the surface water bodies. The results showed that the Pb content in the waters of Jiaozhou Bay ranged within 0.62 - 3.05 μg/L, which conformed to the seawater standard of Class I and II. And it also indicated that in terms of the Pb content, the water bodies of Jiaozhou bay were mildly contaminated by Pb content in May, September and October. The Pb content in Jiaozhou bay mainly had three sources, the transportation of rivers, surface runoff and offshore ocean currents. The Pb content was 2.13 μg/L transported from the rivers, 2.74 μg/L from the surface runoff and 3.05 μg/L from the offshore ocean currents. It demonstrated that the transportation of rivers, surface runoff and offshore ocean currents had been moderated polluted by Pb content. Three different migration paths of Pb content, from land, ocean to Jiaozhou Bay water bodies, have been expressed in model block diagram. In the migration process of Pb content transported from different sources, the author found out the migration rules: 1) the Pb content was continuously decreased with the extension of migration distance;2) the Pb content in the ocean water body was very high with the accumulation of Pb content in the ocean. </div>展开更多
Actually recent investigation in developing semiconducting-superconducting composites based in CdS and Bi-based superconductors has attracted interest in processing thin superconducting films. In this work are reporte...Actually recent investigation in developing semiconducting-superconducting composites based in CdS and Bi-based superconductors has attracted interest in processing thin superconducting films. In this work are reported Bi-Pb-Sr-Ca-Cu-O (BPSCCO) thin films grown on MgO substrates by spray pyrolysis technique from a solution containing Bi(NO3)3, Pb(NO3)2, Sr(NO3)2, Ca(NO3)2 and Cu(NO3)2, with a subsequent solid state reaction for growing the Bi-based superconducting phases. Annealed films were characterized by X-ray diffraction, atomic absorption spectroscopy and resistance measurements. Interdependence between Pb content, annealing time and temperature, in the formation of superconducting phases was studied applying a fractional factorial design 3III4-2. Interrelation between Pb content, ta and Ta exists. The presence of Pb is necessary to stabilize the high-Tc phase but its content depends on the annealing conditions.展开更多
It is discovered that there is the concentrative phenomenon of relative content ratios of Cu, Pb and Zn in soil by studying their parageneous association in soil, meteorites and rocks with the relative content ratios....It is discovered that there is the concentrative phenomenon of relative content ratios of Cu, Pb and Zn in soil by studying their parageneous association in soil, meteorites and rocks with the relative content ratios. This not only is helpful to understand the trends of Cu, Cd and Zn enriched and dispersed in the evolution course of earth matter, but also provides evidence for geochemical self-organization that there may be in the process of Cu, Pb and Zn translation and distribution.展开更多
文摘In this study,the effect of Pb content on the surface morphology and salt spray corrosion resistance of hot dip Zn-AI-Mg coatings was investigated. The results showed that the coating surface easily formed small grains of zinc spangle structures and that the salt spray con＇osion resistance of the coating decreased when Pb content was greater than 0.01%. The microstructure and energy dispersive spectrum analysis of surface and cross-sectional areas was performed by scanning electron microscopy. Pb content present in the coating was analyzed by glow discharge spectrum. The results showed that the distribution of Pb in the coating was not uniform. The Pb content was segregated on the surface and at the cross-section of the Zn-A1-MgZn2 ternary eutectic structure,especially,on the surface of the Zn-A1-MgZn2 ternary eutectic structure.
文摘<div style="text-align:justify;"> According to the survey materials of the waters of Jiaozhou Bay in May, September and October 1993, this article studied the content of Pb and its horizontal distribution in the surface water bodies. The results showed that the Pb content in the waters of Jiaozhou Bay ranged within 0.62 - 3.05 μg/L, which conformed to the seawater standard of Class I and II. And it also indicated that in terms of the Pb content, the water bodies of Jiaozhou bay were mildly contaminated by Pb content in May, September and October. The Pb content in Jiaozhou bay mainly had three sources, the transportation of rivers, surface runoff and offshore ocean currents. The Pb content was 2.13 μg/L transported from the rivers, 2.74 μg/L from the surface runoff and 3.05 μg/L from the offshore ocean currents. It demonstrated that the transportation of rivers, surface runoff and offshore ocean currents had been moderated polluted by Pb content. Three different migration paths of Pb content, from land, ocean to Jiaozhou Bay water bodies, have been expressed in model block diagram. In the migration process of Pb content transported from different sources, the author found out the migration rules: 1) the Pb content was continuously decreased with the extension of migration distance;2) the Pb content in the ocean water body was very high with the accumulation of Pb content in the ocean. </div>
文摘Actually recent investigation in developing semiconducting-superconducting composites based in CdS and Bi-based superconductors has attracted interest in processing thin superconducting films. In this work are reported Bi-Pb-Sr-Ca-Cu-O (BPSCCO) thin films grown on MgO substrates by spray pyrolysis technique from a solution containing Bi(NO3)3, Pb(NO3)2, Sr(NO3)2, Ca(NO3)2 and Cu(NO3)2, with a subsequent solid state reaction for growing the Bi-based superconducting phases. Annealed films were characterized by X-ray diffraction, atomic absorption spectroscopy and resistance measurements. Interdependence between Pb content, annealing time and temperature, in the formation of superconducting phases was studied applying a fractional factorial design 3III4-2. Interrelation between Pb content, ta and Ta exists. The presence of Pb is necessary to stabilize the high-Tc phase but its content depends on the annealing conditions.
基金The Projecton Environmental Background Value of Soilin China(75-60-01-01 )
文摘It is discovered that there is the concentrative phenomenon of relative content ratios of Cu, Pb and Zn in soil by studying their parageneous association in soil, meteorites and rocks with the relative content ratios. This not only is helpful to understand the trends of Cu, Cd and Zn enriched and dispersed in the evolution course of earth matter, but also provides evidence for geochemical self-organization that there may be in the process of Cu, Pb and Zn translation and distribution.
