埋地金属管道杂散电流腐蚀影响因素的研究

Influence Factors of Stray-Current Corrosion of Buried Metal Pipeline

摘要: 埋地管道由于腐蚀泄露会造成不可估量的影响，杂散电流的腐蚀作用严重影响埋地管道的正常使用，研究杂散电流腐蚀影响因素以提出合理有效的防腐蚀措施是十分必要的。目前在不同外加电压和不同土壤环境下对杂散电流大小的研究鲜有报道。通过实验室模拟，采用近参比电极法对管地电位进行测量，研究了在不同外加电压和不同土壤环境下管道的腐蚀行为，结果表明，使用涂层保护可以在一定程度上抑制腐蚀；在一定含量范围内，随着NaCl质量分数的增加，管地电位值呈现增大趋势；在一定深度范围内，随着埋地深度的增加，管地电位逐渐降低；随着外加电压的增加，管地电位逐渐增加。

Abstract: Buried pipeline leakage due to corrosion will cause immeasurable impact. The corrosion effect of stray current will seriously affect the normal use of buried pipeline, and it is necessary to study the factors affecting stray current corrosion to put forward reasonable and effective anti-corrosion measures. There is rare news research about the size of the stray current in different applied voltages and under the different conditions of different soil. Through the laboratory simulation, the recent reference electrode method is adapted to pipe-to-soil potential measurements, and the corrosion behavior of pipeline is studied in different applied voltages and under different soil environments. The results showed that the use of coating protection can suppress the corrosion to a certain extent. Within a certain content range, with the increase of NaCl mass fraction, the ground potential showed an increasing trend. In a certain depth range, with the increase of the buried depth, the ground potential gradually decreases; with the increase of applied voltage, the ground potential increases gradually.