污染土电阻率与Q235钢的腐蚀性评价试验研究
发布时间：2019-01-25 08:32
【摘要】：通过室内模拟试验，研究8种不同类型无机化合物污染土和有机化合物污染土在4种不同致污物质含量下其电阻率的变异性分布规律；同时通过室内埋设与研究Q235钢试样在5个不同腐蚀时间下的腐蚀形貌、腐蚀失重率、腐蚀动力方程、腐蚀速率和腐蚀速率影响因子等腐蚀参数分布规律；最后根据pH值、电阻率和腐蚀失重测试结果进行对比分析，，综合分析了电阻率评价Q235钢腐蚀性等级的可靠性。 （1）通过测试50Hz～1000000Hz共9个不同频率各种污染土电阻率平均值的变异分布规律，得出：随着频率的增大，各种污染土的电阻率平均值与频率呈对数函数降低趋势，其相关系数在0.73～0.99之间，污染土电阻率与频率相关性显著。 （2）分析了固定频率50Hz下污染土的电阻率分布规律，得出：硫酸污染土与汽油污染土的电阻率随着污染介质含量的增大呈增大趋势，其他污染土电阻率随着污染介质含量的增大呈减小趋势；污染土的电阻率与污染介质的含量变化关系比较显著；同时得到了污染土电阻率与污染土饱和度的相关关系式。 （3）对频率为50Hz下8类污染介质33种污染土的电阻率平均值进行由小到大排序分布，得出汽油污染土的P2、P3、P4和硫酸污染土SH4电阻率较未污染土（W）的电阻率要大；其他污染土的电阻率较未污染土（W）的电阻率要小，其中氯化钠污染土NC4、氯化镁污染土MC4、硫酸钠污染土NS4和氢氧化钠污染土NO4四种污染土的电阻率最小。 （4）得到了Q235钢在不同类型污染土不同腐蚀时间下腐蚀宏观形貌并计算了Q235钢的腐蚀失重率、腐蚀动力方程、腐蚀速率和腐蚀速率影响因子。根据失重测试结果得到了Q235钢的平均腐蚀失重率和腐蚀速率排序分布；得到了不同腐蚀时间下污染土腐蚀速率影响因子平均值排序规律，得出：硫酸镁（MS）、氯化镁（MC）和硫酸（HS）三种污染介质的污染土排在后三位，分别为：1.95、2.20和2.42，氢氧化钠（NO）、硫酸钠（NS）和洗衣粉（TD）三种污染介质排在前三位，分别为3.59、6.43和7.82。 （5）结合电阻率、pH值、224天腐蚀速率和不同时间下的腐蚀速率平均值排序，综合评价污染土的腐蚀性等级得出：硫酸污染土（HS）、氢氧化钠污染土（NO）和汽油污染土（P）中Q235钢的腐蚀主要由pH值或有机物控制，由电阻率判别腐蚀性等级会误判；氯化镁污染土（MC）和氯化钠污染土（NC）中Q235钢的腐蚀由电阻率判别腐蚀性等级会高判或重判；硫酸钠污染土（NS）和洗衣粉污染土（TD）中Q235钢的腐蚀性根据电阻率评判会低判或轻判；而硫酸镁污染土（MS）中Q235钢的腐蚀性等级根据电阻率评判相对准确。 本文研究可为国家或行业标准的制定或修订，与为在污染土中相关工程建设项目的设计选材与防护技术提供重要的基础数据和科学依据，有重大的经济和社会效益。
[Abstract]:The variability distribution of resistivity of 8 kinds of inorganic compound contaminated soil and organic compound contaminated soil under four different content of pollutants were studied by laboratory simulation test. At the same time, the distribution of corrosion parameters such as corrosion morphology, corrosion weight loss rate, corrosion dynamic equation, corrosion rate and influence factors of corrosion rate of Q235 steel samples under 5 different corrosion time were studied by embedding and studying in laboratory. Finally, according to the pH value, resistivity and corrosion weight loss test results, the reliability of resistivity evaluation of corrosion grade of Q235 steel is comprehensively analyzed. The main results are as follows: (1) by testing the variation distribution law of resistivity average value of 9 kinds of polluted soils at different frequencies of 50Hz~1000000Hz, it is concluded that with the increase of frequency, the average and frequency of resistivity of various polluted soils decrease by logarithmic function. The correlation coefficient is between 0.73 and 0.99, and the resistivity of contaminated soil is significantly correlated with frequency. (2) the resistivity distribution of contaminated soil under fixed frequency 50Hz is analyzed. It is concluded that the resistivity of sulfuric acid contaminated soil and gasoline contaminated soil increases with the increase of polluted medium content. The resistivity of other contaminated soils decreased with the increase of the content of contaminated medium. The relationship between the resistivity of contaminated soil and the content of contaminated medium is significant, and the correlation between the resistivity of contaminated soil and saturation of contaminated soil is obtained. (3) the average resistivity of 33 kinds of polluted soils with 50Hz frequency is arranged from small to large. The results show that the resistivity of gasoline contaminated soil and sulfuric acid contaminated soil SH4 is higher than that of unpolluted soil (W). The resistivity of other contaminated soils is smaller than that of unpolluted soils, and the resistivity of NC4, contaminated soil, magnesium chloride contaminated soil, MC4, sulfate contaminated soil, NS4, and sodium hydroxide contaminated soil, NO4, is the lowest. (4) the corrosion macroscopic morphology of Q235 steel under different corrosion time was obtained, and the corrosion weight loss rate, corrosion dynamic equation, corrosion rate and corrosion rate influence factors of Q235 steel were calculated. According to the results of weightlessness test, the average corrosion weight loss rate and the order distribution of corrosion rate of Q235 steel were obtained. The order law of the average value of the factors affecting the corrosion rate of contaminated soil at different corrosion time was obtained. It was concluded that the contaminated soil of magnesium sulfate (MS), magnesium chloride (MC) and (HS) sulphate was in the last three places. Sodium hydroxide (NO),) sodium sulfate (NS) and washing powder (TD) were the first three pollutants, which were 3.59% 6.43 and 7.82 respectively. (5) according to the order of resistivity, pH value, 224 day corrosion rate and the average corrosion rate of different time, the corrosion grade of contaminated soil is evaluated synthetically. The (HS), of sulfuric acid contaminated soil is obtained. The corrosion of Q235 steel in sodium hydroxide contaminated soil (NO) and gasoline contaminated soil (P) is mainly controlled by pH value or organic matter. The corrosion of Q235 steel in magnesium chloride contaminated soil (MC) and sodium chloride contaminated soil (NC) is higher or heavier if the corrosion grade of Q235 steel is judged by resistivity. The corrosivity of Q235 steel in sodium sulfate contaminated soil (NS) and washing powder contaminated soil (TD) is lower or lighter according to resistivity evaluation, while the corrosion grade of Q235 steel in magnesium sulfate contaminated soil (MS) is relatively accurate according to resistivity evaluation. The research in this paper can provide important basic data and scientific basis for the formulation or revision of national or industry standards, and for the design, selection and protection technology of related engineering construction projects in contaminated soil, which has great economic and social benefits.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU411;X53
[Abstract]:The variability distribution of resistivity of 8 kinds of inorganic compound contaminated soil and organic compound contaminated soil under four different content of pollutants were studied by laboratory simulation test. At the same time, the distribution of corrosion parameters such as corrosion morphology, corrosion weight loss rate, corrosion dynamic equation, corrosion rate and influence factors of corrosion rate of Q235 steel samples under 5 different corrosion time were studied by embedding and studying in laboratory. Finally, according to the pH value, resistivity and corrosion weight loss test results, the reliability of resistivity evaluation of corrosion grade of Q235 steel is comprehensively analyzed. The main results are as follows: (1) by testing the variation distribution law of resistivity average value of 9 kinds of polluted soils at different frequencies of 50Hz~1000000Hz, it is concluded that with the increase of frequency, the average and frequency of resistivity of various polluted soils decrease by logarithmic function. The correlation coefficient is between 0.73 and 0.99, and the resistivity of contaminated soil is significantly correlated with frequency. (2) the resistivity distribution of contaminated soil under fixed frequency 50Hz is analyzed. It is concluded that the resistivity of sulfuric acid contaminated soil and gasoline contaminated soil increases with the increase of polluted medium content. The resistivity of other contaminated soils decreased with the increase of the content of contaminated medium. The relationship between the resistivity of contaminated soil and the content of contaminated medium is significant, and the correlation between the resistivity of contaminated soil and saturation of contaminated soil is obtained. (3) the average resistivity of 33 kinds of polluted soils with 50Hz frequency is arranged from small to large. The results show that the resistivity of gasoline contaminated soil and sulfuric acid contaminated soil SH4 is higher than that of unpolluted soil (W). The resistivity of other contaminated soils is smaller than that of unpolluted soils, and the resistivity of NC4, contaminated soil, magnesium chloride contaminated soil, MC4, sulfate contaminated soil, NS4, and sodium hydroxide contaminated soil, NO4, is the lowest. (4) the corrosion macroscopic morphology of Q235 steel under different corrosion time was obtained, and the corrosion weight loss rate, corrosion dynamic equation, corrosion rate and corrosion rate influence factors of Q235 steel were calculated. According to the results of weightlessness test, the average corrosion weight loss rate and the order distribution of corrosion rate of Q235 steel were obtained. The order law of the average value of the factors affecting the corrosion rate of contaminated soil at different corrosion time was obtained. It was concluded that the contaminated soil of magnesium sulfate (MS), magnesium chloride (MC) and (HS) sulphate was in the last three places. Sodium hydroxide (NO),) sodium sulfate (NS) and washing powder (TD) were the first three pollutants, which were 3.59% 6.43 and 7.82 respectively. (5) according to the order of resistivity, pH value, 224 day corrosion rate and the average corrosion rate of different time, the corrosion grade of contaminated soil is evaluated synthetically. The (HS), of sulfuric acid contaminated soil is obtained. The corrosion of Q235 steel in sodium hydroxide contaminated soil (NO) and gasoline contaminated soil (P) is mainly controlled by pH value or organic matter. The corrosion of Q235 steel in magnesium chloride contaminated soil (MC) and sodium chloride contaminated soil (NC) is higher or heavier if the corrosion grade of Q235 steel is judged by resistivity. The corrosivity of Q235 steel in sodium sulfate contaminated soil (NS) and washing powder contaminated soil (TD) is lower or lighter according to resistivity evaluation, while the corrosion grade of Q235 steel in magnesium sulfate contaminated soil (MS) is relatively accurate according to resistivity evaluation. The research in this paper can provide important basic data and scientific basis for the formulation or revision of national or industry standards, and for the design, selection and protection technology of related engineering construction projects in contaminated soil, which has great economic and social benefits.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU411;X53
【参考文献】
相关期刊论文 前10条
1 杜翠薇,李晓刚,武俊伟,宋义全,徐t
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