It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is...It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is applicable for the determination of trace concentration of chlordeion in the range of 0～5.0μg/mL.The recoveries of the method are found to be in the range 98.30%～101.13% with RSD smaller than 5.0%.The method is simple and rapid.展开更多
Accelerated corrosion test of stainless steel with weld was carried out to investigate the corrosion behavior under the wetdry cyclic condition in the atmosphere containing Cl^-. In the surface morphology, corrosion p...Accelerated corrosion test of stainless steel with weld was carried out to investigate the corrosion behavior under the wetdry cyclic condition in the atmosphere containing Cl^-. In the surface morphology, corrosion products were analyzed by metallographic observation, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The results show that the damage to stainless steel with weld in the atmosphere containing Cl^- is due to localized corrosion, especially pitting and galvanic corrosion, Weld acts as the anode, whereas matrix acts as the cathode in the corrosion process. The pitting corrosion, including the nucleation and growth of a stable pit, is promoted by the presence of wet-dry cycles, especially during the drying stage. Pits centralizing in weld are found to be grouped together like colonies, with a number of smaller pits surrounding a larger pit. The composition of the corrosion products is Fe2O3, Cr2O3, Fe3O4, NiCrO4, etc.展开更多
文摘It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is applicable for the determination of trace concentration of chlordeion in the range of 0～5.0μg/mL.The recoveries of the method are found to be in the range 98.30%～101.13% with RSD smaller than 5.0%.The method is simple and rapid.
基金This work was financially supported by the National Natural Science Foundation of China (No.50601012).
文摘Accelerated corrosion test of stainless steel with weld was carried out to investigate the corrosion behavior under the wetdry cyclic condition in the atmosphere containing Cl^-. In the surface morphology, corrosion products were analyzed by metallographic observation, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The results show that the damage to stainless steel with weld in the atmosphere containing Cl^- is due to localized corrosion, especially pitting and galvanic corrosion, Weld acts as the anode, whereas matrix acts as the cathode in the corrosion process. The pitting corrosion, including the nucleation and growth of a stable pit, is promoted by the presence of wet-dry cycles, especially during the drying stage. Pits centralizing in weld are found to be grouped together like colonies, with a number of smaller pits surrounding a larger pit. The composition of the corrosion products is Fe2O3, Cr2O3, Fe3O4, NiCrO4, etc.
