This paper advances the viewpoints and methods of the rapid sample product trial manufacture technique for developing water meter new products by CAD and simulation, computer virtual assembling and optimizing, rapid m...This paper advances the viewpoints and methods of the rapid sample product trial manufacture technique for developing water meter new products by CAD and simulation, computer virtual assembling and optimizing, rapid machining process and measurement etc. as the design and sample product trial manufacture process of water meter new products are long in product development period, and low in product development efficiency in the present time.展开更多
Corrosion products of K60crevice samples which were buried in Ordos area were analyzed by scanning electron microscopy and X-ray diffraction.The result showed that,the corrosion potential decreased differently in the ...Corrosion products of K60crevice samples which were buried in Ordos area were analyzed by scanning electron microscopy and X-ray diffraction.The result showed that,the corrosion potential decreased differently in the crevice and a maximum negative existed at the bottom side;with pH value reduced,the dissolved oxygen was nearly exhausted in the crevice.When the opening side of the coupons was coupled with each other,the crevice corrosion in the crevice might be accelerated and the pH value gradually reduced;however,the oxygen was not completely exhausted.The unbalanced current density between anode and cathode was the main cause of blocked self-catalysis effect in the crevice,and was also the main cause of corrosion of alloys.Lumpy corrosion happened on the surface of metal,and rusty layer was composed of Fe3O4,Fe2O3,FeO,FeOOH and FeS which distributed in the opening of crevice.There were the reddish-brown corrosion products and white matter which distributed in the form of filiform and spotted in the center part of crevice.The analysis showed that the white matter might include oxide of Fe and NaHCO3.展开更多
文摘This paper advances the viewpoints and methods of the rapid sample product trial manufacture technique for developing water meter new products by CAD and simulation, computer virtual assembling and optimizing, rapid machining process and measurement etc. as the design and sample product trial manufacture process of water meter new products are long in product development period, and low in product development efficiency in the present time.
基金Sponsored by Natural Science Foundation of Inner Mongolia of China(20080404MS0805)
文摘Corrosion products of K60crevice samples which were buried in Ordos area were analyzed by scanning electron microscopy and X-ray diffraction.The result showed that,the corrosion potential decreased differently in the crevice and a maximum negative existed at the bottom side;with pH value reduced,the dissolved oxygen was nearly exhausted in the crevice.When the opening side of the coupons was coupled with each other,the crevice corrosion in the crevice might be accelerated and the pH value gradually reduced;however,the oxygen was not completely exhausted.The unbalanced current density between anode and cathode was the main cause of blocked self-catalysis effect in the crevice,and was also the main cause of corrosion of alloys.Lumpy corrosion happened on the surface of metal,and rusty layer was composed of Fe3O4,Fe2O3,FeO,FeOOH and FeS which distributed in the opening of crevice.There were the reddish-brown corrosion products and white matter which distributed in the form of filiform and spotted in the center part of crevice.The analysis showed that the white matter might include oxide of Fe and NaHCO3.
