汽油和洗衣粉污染土对Q235钢的腐蚀试验研究

发布时间：2018-12-28 07:35

【摘要】：通过室内模拟试验，统计分析了汽油和洗衣粉污染土的物理、力学和电化学性质；研究了Q235钢的宏观、微观腐蚀形貌和腐蚀速率的变化规律；由灰关联法建立起腐蚀速率与污染土腐蚀参数的多元线性回归方程，为实际工程中钢材的腐蚀防护提供参考。（1）经过统计研究汽油和洗衣粉污染土的物理、力学和电化学性质，得出：土的可塑性指标（液限、塑限和塑性指数）随汽油含量的增加而减小，随洗衣粉含量的增加而增大；密度、饱和度和电阻率随汽油含量的增加而增大，随洗衣粉含量的增加而减小；压缩系数随着压力的增大而减小，压缩模量随着压力的增大而增大，随污染物含量增加的变化规律不明显；氧化还原电位随污染物含量的增加而减小。（2）经过对比分析汽油和洗衣粉对土的基本参数的影响程度，得出：汽油对密度和腐蚀电位的影响比洗衣粉大；洗衣粉对土的含水量、饱和度、电阻率和氧化还原电位的影响比汽油大；综合来看，相同含量下的洗衣粉污染土比汽油污染土对钢的腐蚀性强。（3）经过对比观察Q235钢在汽油和洗衣粉污染土中的宏观和微观腐蚀形貌，得出：腐蚀强度随腐蚀时间的增加而加大，随汽油含量的增加而加大，随洗衣粉含量的增加而先加大后减小；腐蚀初期为不均匀腐蚀，腐蚀后期为均匀腐蚀，腐蚀产物逐渐增多，腐蚀坑逐渐加深，，腐蚀越来越严重；Q235钢在洗衣粉污染土中的腐蚀坑比在汽油污染土中的大或深，甚至形成了穿透性的孔洞。（4）Q235钢的腐蚀速率随汽油含量和腐蚀时间的增加而增大，随洗衣粉含量的增加而先加大后减小。由灰关联法确定了汽油污染土的腐蚀参数对腐蚀速率的影响顺序（电阻率、氧化还原电位和汽油含量三个参数对Q235钢的腐蚀起主导作用）及洗衣粉污染土的腐蚀参数对腐蚀速率的影响顺序（密度、腐蚀电位和氧化还原电位三个参数对Q235钢的腐蚀起主导作用），并建立了腐蚀速率与主要腐蚀参数的多元线性回归方程，可用于预测Q235钢在污染土中的腐蚀速率。
[Abstract]:The physical, mechanical and electrochemical properties of gasoline and detergent contaminated soil were statistically analyzed through laboratory simulation tests, and the changes of macroscopic and microscopic corrosion morphology and corrosion rate of Q235 steel were studied. The multivariate linear regression equation between corrosion rate and corrosion parameters of contaminated soil is established by grey correlation method, which provides a reference for the corrosion protection of steel in practical engineering. The main results are as follows: (1) the physical, mechanical and electrochemical properties of gasoline and detergent contaminated soil are studied statistically. It is concluded that the plasticity index (liquid limit, plastic limit and plastic index) of the soil decreases with the increase of gasoline content. The content of detergent increased with the increase of detergent content. The density, saturation and resistivity increase with the increase of gasoline content, and decrease with the increase of detergent content. The compression coefficient decreases with the increase of the pressure, the modulus of compression increases with the increase of the pressure, and the variation law with the increase of the pollutant content is not obvious, while the redox potential decreases with the increase of the pollutant content. (2) by comparing and analyzing the influence of gasoline and washing powder on the basic parameters of soil, it is concluded that the influence of gasoline on density and corrosion potential is greater than that on washing powder; The effect of washing powder on soil moisture saturation resistivity and redox potential is greater than that of gasoline. (3) by comparing and observing the macroscopic and microscopic corrosion morphology of Q235 steel in gasoline and detergent contaminated soil, it is concluded that the corrosion strength increases with the increase of corrosion time and increases with the increase of gasoline content. With the increase of washing powder content, it first increases and then decreases. At the beginning of corrosion, the corrosion is uneven, and the corrosion is uniform in the later stage. The corrosion products increase gradually, the corrosion pit deepens gradually, and the corrosion becomes more and more serious. The corrosion pits of Q235 steel in detergent contaminated soil are larger or deeper than those in gasoline contaminated soil, and even form penetrating holes. (4) the corrosion rate of Q235 steel increases with the increase of gasoline content and corrosion time, and then decreases with the increase of washing powder content. The influence order of corrosion parameters of gasoline contaminated soil on corrosion rate (resistivity, resistivity) was determined by grey correlation method. Three parameters, redox potential and gasoline content, play a leading role in the corrosion of Q235 steel. Corrosion potential and redox potential play a dominant role in the corrosion of Q235 steel. The multivariate linear regression equation between corrosion rate and main corrosion parameters is established, which can be used to predict the corrosion rate of Q235 steel in contaminated soil.
【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

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