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通过室内模拟实验建立了交流电流密度与破损面积、土壤电阻率、交流干扰电压以及防腐层电阻率之间的数学模型,从而间接获取交流电流密度,并研究了交流电流密度对腐蚀速率的影响。通过CDEGS软件模拟仿真,得到了并行长度、电流等级、距离、土壤电阻率等参数对交流干扰沿管道分布的作用。结果表明,破损面积、交流干扰电压、土壤电阻率、防腐层电阻率对交流杂散电流密度具有显著的影响。电流密度小于3 mA/cm2时,交流电流腐蚀危害性很小;在3~10 mA/cm2时,腐蚀危害性较大;大于10 mA/cm2时,交流腐蚀危害性很大。
A mathematical model between AC current density, damaged area, soil resistivity, AC interference voltage and corrosion resistance of the coating was established through indoor simulation experiments. The AC current density was obtained indirectly and the influence of AC current density on the corrosion rate was studied. By CDEGS software simulation, the effects of parallel length, current level, distance and soil resistivity on the distribution of AC interference along the pipelines were obtained. The results show that the damaged area, the AC interference voltage, the soil resistivity and the resistivity of the coating have a significant influence on the AC stray current density. When the current density is less than 3 mA / cm2, the AC current is less harmful to the corrosion. When the current density is 3 to 10 mA / cm2, the corrosion is more harmful. When the current density is greater than 10 mA / cm2, the AC corrosion is very harmful.