Study of corrosion characteristics and material selection of ozone treatment system for sewage of refineries
For the phenomenon of escaping,emitting,dripping and leaking occurred in some equipment and pipelines,especially serious corrosion in the weld heat affected zone of pipelines during the long period operation of the ozone treatment system,the effects of ozone concentration and chloride ion concentration on corrosion rate were studied by laboratory electrochemical test,simulated immersion test and field corrosion evaluation testing,the corrosion resistance of different metal materials in wastewater environment with ozone was clarified,and the recommended material selection scheme was given finally.The experimental results show that in wastewater environment with high concentration of chloride and ozone,the susceptibility of 022Cr17Ni12Mo2 stainless steel to pitting was positively correlated with the ozone concentration and chloride ion concentration.There is the synergistic corrosion mechanism between the two factors.The corrosion resistance of Q245R,022Cr19Ni10 and 022Cr17Ni12Mo2 was relatively poor in this environment;While 022Cr19Ni13Mo3,015Cr21Ni26Mo5Cu2,022Cr23Ni5Mo3N and 015Cr20Ni18Mo6CuN materials show good pitting and crevice corrosion resistance.It is recommended to use 022Cr19Ni13Mo3 as the materials of equipment and pipelines in the ozone treatment system for refinery wastewater.
metal materialsrefinery wastewatercorrosionozonechloride ionmaterial selection
万方数据
维普
