成都市土壤腐蚀性评价与公用埋地管道防腐措施分析

Soil Corrosivity Assessment and Anti-corrosion Measures of Public Buried Pipelines in Chengdu City

本文以成都市为例,基于土壤腐蚀性指标(电阻率、p H值、含水量、含盐量和Cl-含量)的调查,采用评分法对土壤腐蚀性进行分析和评价。结果表明:成都市土壤采样点的电阻率、p H值、含水量、含盐量、Cl-含量分别介于52~270Ω·m、4.50~7.73、9.70%~22.49%、0.05%~0.61%、0.0036%~0.0089%之间。根据单因素方差分析,各指标在城市不同方位和不同圈层无显著性差异;此外,成都市土壤采样点腐蚀性评分为9.5,属于中等腐蚀水平;其腐蚀性评分在不同圈层上无显著性差异,但是在方位上,具有显著性差异,尤其是在成都西面,土壤腐蚀性相对更高。综上所述,在成都市公用埋地管道建设和运行过程中,需从质量控制、防腐技术、防腐检验与检测等方面做好相应的防腐措施。

Taking Chengdu city as an example, the soil corrosivity was assessed by the grading method based on the monitoring of resistivity, p H, water content, salt content and chloride iron content. The results indicated that the resistivity, p H, water content, salt content and chloride iron content ranged 52 ~ 270 Ω·m, 4.50 ~ 7.73, 9.70% ~ 22.49%, 0.05% ~ 0.61% and 0.0036% ~ 0.0089% respectively. According to the ANOVA, there were no significant differences of those soil corrosivity indicators both in different directions and in different ring counties around the center city of Chengdu. The core of soil corrosivity was 9.5 which pointed out that the level of soil corrosivity was median. The soil corrosivity was no significant difference in different ring counties but had a significant difference in different directions. The soil corrosivity was relatively higher in the western counties than other direction counties. Therefore, many quality control measures, anti-corrosion techniques, corrosion inspection and testing were suggested to preserve buried steel pipelines in Chengdu city.